Re: [Emc-users] Rotary stage
On 7 November 2013 00:09, andy pugh bodge...@gmail.com wrote: IGES file: http://www.bodgesoc.org/cycloidal.igs This file has now been updated with the adjustable-throw eccentric (using a vernier-hole arrangement it allows adjustment in 4um increments (.00016) Also there is now a http://www.bodgesoc.org/cycloidal.stp for those for whom the STEP format is better. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 4 November 2013 00:03, Florian Rist fr...@fs.tum.de wrote: Hmm, so I don't get it. The ratio is almost one so, right? I made an animation to demonstrate the concept: http://youtu.be/VrvwlPxRhKU -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Wednesday 06 November 2013 16:02:21 andy pugh did opine: On 4 November 2013 00:03, Florian Rist fr...@fs.tum.de wrote: Hmm, so I don't get it. The ratio is almost one so, right? I made an animation to demonstrate the concept: http://youtu.be/VrvwlPxRhKU That sure looks doable. And scalable to any size. And with that many teeth engaged at once, it should be essentially unbreakable and very low lash if properly adjusted with the wedges. They, I assume actually adjust the eccentricity of inner gear? Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) QOTD: He's on the same bus, but he's sure as hell got a different ticket. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 6 November 2013 21:08, Gene Heskett ghesk...@wdtv.com wrote: That sure looks doable. And scalable to any size. And with that many teeth engaged at once, it should be essentially unbreakable and very low lash if properly adjusted with the wedges. They, I assume actually adjust the eccentricity of inner gear? No, those adjust the play in the anti-rotation cruciform part. Old-school tapered gibs. I was seriously considering dovetail slides but I think that might make assembly harder than necessary. Eccentricity could be adjusted by a second, thin, static eccentric round the main one. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Wednesday 06 November 2013 17:58:53 andy pugh did opine: On 6 November 2013 21:08, Gene Heskett ghesk...@wdtv.com wrote: That sure looks doable. And scalable to any size. And with that many teeth engaged at once, it should be essentially unbreakable and very low lash if properly adjusted with the wedges. They, I assume actually adjust the eccentricity of inner gear? No, those adjust the play in the anti-rotation cruciform part. Old-school tapered gibs. I was seriously considering dovetail slides but I think that might make assembly harder than necessary. Eccentricity could be adjusted by a second, thin, static eccentric round the main one. Ok, I wondered about that since the animation doesn't show that at all well. I'd have to assume a narrow shoulder, drilled for a setscrew or 2 to lock the adjustment of this outer eccentric to the inner one the motor is driving. Tapered gibs, which can be power driven in both directions should be quite suitable since thats a large area wear point with not very heavy loading. Has trial code to carve been composed yet? And has it been analyzed for back driving ease or difficulty? Given low friction, and dual eccentrics at each corner driven in unison, it does appear to be both pretty efficient, and back drivable to me. As you can see, I am drooling about its possibilities. And I have a stock of 1/2 x 4 7078T6 for the exterior frame sandwich. ;-) Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Death is Nature's way of recycling human beings. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 6 November 2013 23:14, Gene Heskett ghesk...@wdtv.com wrote: Eccentricity could be adjusted by a second, thin, static eccentric round the main one. Ok, I wondered about that since the animation doesn't show that at all It's not there to show :-) Has trial code to carve been composed yet? I only designed it this lunchtime (I admit that my lunch break became rather extended) And has it been analyzed for back driving ease or difficulty? No, it was designed entirely from the point of view of what needle roller cages exist and What looks about right -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 6 November 2013 23:14, Gene Heskett ghesk...@wdtv.com wrote: Has trial code to carve been composed yet? IGES file: http://www.bodgesoc.org/cycloidal.igs -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Wednesday 06 November 2013 19:16:04 andy pugh did opine: On 6 November 2013 23:14, Gene Heskett ghesk...@wdtv.com wrote: Has trial code to carve been composed yet? IGES file: http://www.bodgesoc.org/cycloidal.igs Unforch, I don't have a thing that can render that, or make gcode from it. Not your fault of course, but I refuse to pay the microsoft tax. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) BOFH excuse #206: Police are examining all internet packets in the search for a narco-net- trafficker A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 2013-11-07 01:19, Gene Heskett wrote: IGES file: http://www.bodgesoc.org/cycloidal.igs Unforch, I don't have a thing that can render that, or make gcode from it. Not your fault of course, but I refuse to pay the microsoft tax. Cheers, Gene Freecad can handle this type. -- In der Wissenschaft siegt nie eine neue Theorie, nur ihre Gegner sterben nach und nach Max Planck -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Wednesday 06 November 2013 19:51:04 W. Martinjak did opine: On 2013-11-07 01:19, Gene Heskett wrote: IGES file: http://www.bodgesoc.org/cycloidal.igs Unforch, I don't have a thing that can render that, or make gcode from it. Not your fault of course, but I refuse to pay the microsoft tax. Cheers, Gene Freecad can handle this type. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Limited delivery area. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 7 November 2013 00:19, Gene Heskett ghesk...@wdtv.com wrote: IGES file: http://www.bodgesoc.org/cycloidal.igs Unforch, I don't have a thing that can render that, or make gcode from it. Not your fault of course, but I refuse to pay the microsoft tax. IGES is a NIST standard, nothing to do with Microsoft at all. I just opened the IGES file with FreeCAD. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Wednesday 06 November 2013 19:51:17 W. Martinjak did opine: On 2013-11-07 01:19, Gene Heskett wrote: IGES file: http://www.bodgesoc.org/cycloidal.igs Unforch, I don't have a thing that can render that, or make gcode from it. Not your fault of course, but I refuse to pay the microsoft tax. Cheers, Gene Freecad can handle this type. I update it at least weekly. The last .IGA I fed it drew about a dozen dots at random locations, and then upchucked, I had to kill it with a root session of htop. But I'll give it another shot right now. Great, it worked. Thanks. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Limited delivery area. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Wednesday 06 November 2013 20:09:55 andy pugh did opine: On 7 November 2013 00:19, Gene Heskett ghesk...@wdtv.com wrote: IGES file: http://www.bodgesoc.org/cycloidal.igs Unforch, I don't have a thing that can render that, or make gcode from it. Not your fault of course, but I refuse to pay the microsoft tax. IGES is a NIST standard, nothing to do with Microsoft at all. I just opened the IGES file with FreeCAD. So did I just now, and it worked. A week ago it upchucked took a root session kill to get rid of it. But its been updated since too. ;-) Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Whatever you want to do, you have to do something else first. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 4 November 2013 00:03, Florian Rist fr...@fs.tum.de wrote: Hmm, so I don't get it. The ratio is almost one so, right? One gear doesn't rotate, it just wobbles. This is the design I came up with a few years ago, but I was trying to solve a packaging problem, not a backlash problem. http://imagebin.org/275720 (I had to feed the drive through a 2mm thick gap) -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Hi Stuart http://en.wikipedia.org/wiki/Cycloidal_drive Thanks for the link. I searched for 'orbital drive' but only found 1964 (or so) patent with a few drawings that didn't help to much. I knew this kind of drive, but could not see it in the iges sketch file, as I didn't see any of the inner 'wobbling' system. I imported the file to Rhino to view it and probably only got like half of the drawing. Thanks for your explanations. Flo -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
You have all of what is completed. I am doing this in my spare moments. The 'wobbling' system has not been modeled. On Mon, Nov 4, 2013 at 7:33 AM, Florian Rist fr...@fs.tum.de wrote: Hi Stuart http://en.wikipedia.org/wiki/Cycloidal_drive Thanks for the link. I searched for 'orbital drive' but only found 1964 (or so) patent with a few drawings that didn't help to much. I knew this kind of drive, but could not see it in the iges sketch file, as I didn't see any of the inner 'wobbling' system. I imported the file to Rhino to view it and probably only got like half of the drawing. Thanks for your explanations. Flo -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 4 November 2013 13:39, Stuart Stevenson stus...@gmail.com wrote: You have all of what is completed. I am doing this in my spare moments. The 'wobbling' system has not been modeled. The wobbling system exercised my imagination for weeks. The version I showed a picture of earlier was about V3 and had grooves in the mating faces with ball-bearings as linear guideways. I tried a number of other ideas too (flexures, a simple torque arm). One thing I didn't try (because I was trying to solve a problem of fitting things in, rather than anything mechanical) was two eccentrics diametrically opposite each other and geared together. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
My goal is to drive the table (large dia) and keep the wobble plate from rotating as it wobbles. The cross slot on the wobble plate may or may not stay. On Nov 4, 2013 7:57 AM, andy pugh bodge...@gmail.com wrote: On 4 November 2013 13:39, Stuart Stevenson stus...@gmail.com wrote: You have all of what is completed. I am doing this in my spare moments. The 'wobbling' system has not been modeled. The wobbling system exercised my imagination for weeks. The version I showed a picture of earlier was about V3 and had grooves in the mating faces with ball-bearings as linear guideways. I tried a number of other ideas too (flexures, a simple torque arm). One thing I didn't try (because I was trying to solve a problem of fitting things in, rather than anything mechanical) was two eccentrics diametrically opposite each other and geared together. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 4 November 2013 14:02, Stuart Stevenson stus...@gmail.com wrote: My goal is to drive the table (large dia) and keep the wobble plate from rotating as it wobbles. The cross slot on the wobble plate may or may not stay. The simplest solution (especially if you have the parts) is probably a couple of sets of linear guides. But I still want to see if the twin-eccentric idea works. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Monday 04 November 2013 10:14:05 andy pugh did opine: On 4 November 2013 13:39, Stuart Stevenson stus...@gmail.com wrote: You have all of what is completed. I am doing this in my spare moments. The 'wobbling' system has not been modeled. The wobbling system exercised my imagination for weeks. The version I showed a picture of earlier was about V3 and had grooves in the mating faces with ball-bearings as linear guideways. I tried a number of other ideas too (flexures, a simple torque arm). One thing I didn't try (because I was trying to solve a problem of fitting things in, rather than anything mechanical) was two eccentrics diametrically opposite each other and geared together. And that actually makes sense Andy. Reducing the precision parts to the bearings themselves. Any patents to be bought? Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Besides, I think Slackware sounds better than 'Microsoft,' don't you? -- Patrick Volkerding A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Monday 04 November 2013 10:18:59 andy pugh did opine: On 4 November 2013 14:02, Stuart Stevenson stus...@gmail.com wrote: My goal is to drive the table (large dia) and keep the wobble plate from rotating as it wobbles. The cross slot on the wobble plate may or may not stay. The simplest solution (especially if you have the parts) is probably a couple of sets of linear guides. But I still want to see if the twin-eccentric idea works. I think it would work very well when driven by timing belts with backside tensioners so that minor diffs in timing could be used to diddle the wear backlash. That I can handle, but profiling the gears would probably be frustrating at least since I've no clue about the math. But I do have a big block of alu that could contain it. Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) I'll rob that rich person and give it to some poor deserving slob. That will *prove* I'm Robin Hood. -- Daffy Duck, Looney Tunes, _Robin Hood Daffy_ A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Stuart Stevenson wrote: My goal is to drive the table (large dia) and keep the wobble plate from rotating as it wobbles. You just need two eccentrics. The other one can be left free. (Hmm, maybe you actually need a 3rd eccentric to prevent any rotation of the plate.) I've seen some commercial schemes that used this kind of mechanism. One I can think of it scroll pumps. Jon -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Andy, I am busy with such a design. I think it is called an Orbital drive. I have not cut any parts yet but will start soon. Can you share your experiences with this idea? On 2013/11/03 12:53 AM, andy pugh wrote: On 2 November 2013 19:47, Stuart Stevenson stus...@gmail.com wrote: Andy, this is my idea of a rotary drive https://www.dropbox.com/s/jbc53qf9dx4cxjp/rotarycurvic.igs I think I tried to build something like that once, in fact I was hoping to use it in a product. Mine was an internal gear driving a spur gear with two teeth fewer. The idea was for the internally-toothed gear to wobble in a small circle. (driven by an eccentric on a motor). I was mainly trying for a very thin drive, at the time. I think we gave up on it eventually, as I had a plan B that involved a bit less invention. -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
it is a cycloidal drive On Sun, Nov 3, 2013 at 7:32 AM, Marius Liebenberg mar...@mastercut.co.zawrote: Andy, I am busy with such a design. I think it is called an Orbital drive. I have not cut any parts yet but will start soon. Can you share your experiences with this idea? On 2013/11/03 12:53 AM, andy pugh wrote: On 2 November 2013 19:47, Stuart Stevenson stus...@gmail.com wrote: Andy, this is my idea of a rotary drive https://www.dropbox.com/s/jbc53qf9dx4cxjp/rotarycurvic.igs I think I tried to build something like that once, in fact I was hoping to use it in a product. Mine was an internal gear driving a spur gear with two teeth fewer. The idea was for the internally-toothed gear to wobble in a small circle. (driven by an eccentric on a motor). I was mainly trying for a very thin drive, at the time. I think we gave up on it eventually, as I had a plan B that involved a bit less invention. -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Thats the one!! I knew it has something to do with round and round. On 2013/11/03 05:49 PM, Stuart Stevenson wrote: it is a cycloidal drive On Sun, Nov 3, 2013 at 7:32 AM, Marius Liebenberg mar...@mastercut.co.zawrote: Andy, I am busy with such a design. I think it is called an Orbital drive. I have not cut any parts yet but will start soon. Can you share your experiences with this idea? On 2013/11/03 12:53 AM, andy pugh wrote: On 2 November 2013 19:47, Stuart Stevenson stus...@gmail.com wrote: Andy, this is my idea of a rotary drive https://www.dropbox.com/s/jbc53qf9dx4cxjp/rotarycurvic.igs I think I tried to build something like that once, in fact I was hoping to use it in a product. Mine was an internal gear driving a spur gear with two teeth fewer. The idea was for the internally-toothed gear to wobble in a small circle. (driven by an eccentric on a motor). I was mainly trying for a very thin drive, at the time. I think we gave up on it eventually, as I had a plan B that involved a bit less invention. -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
I'm too lazy to get an igs viewer, is it a harmonic drive? I have a pile of harmonic drives in the basement off of a robot I bought cheap. On Sun, Nov 3, 2013 at 10:49 AM, Stuart Stevenson stus...@gmail.com wrote: it is a cycloidal drive On Sun, Nov 3, 2013 at 7:32 AM, Marius Liebenberg mar...@mastercut.co.zawrote: Andy, I am busy with such a design. I think it is called an Orbital drive. I have not cut any parts yet but will start soon. Can you share your experiences with this idea? On 2013/11/03 12:53 AM, andy pugh wrote: On 2 November 2013 19:47, Stuart Stevenson stus...@gmail.com wrote: Andy, this is my idea of a rotary drive https://www.dropbox.com/s/jbc53qf9dx4cxjp/rotarycurvic.igs I think I tried to build something like that once, in fact I was hoping to use it in a product. Mine was an internal gear driving a spur gear with two teeth fewer. The idea was for the internally-toothed gear to wobble in a small circle. (driven by an eccentric on a motor). I was mainly trying for a very thin drive, at the time. I think we gave up on it eventually, as I had a plan B that involved a bit less invention. -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Not harmonic Same concept of two gears - one with one less tooth than the other. All parts are solid - no flexing. Search for orbital drive. On Nov 3, 2013 1:55 PM, Eric Keller eekel...@psu.edu wrote: I'm too lazy to get an igs viewer, is it a harmonic drive? I have a pile of harmonic drives in the basement off of a robot I bought cheap. On Sun, Nov 3, 2013 at 10:49 AM, Stuart Stevenson stus...@gmail.com wrote: it is a cycloidal drive On Sun, Nov 3, 2013 at 7:32 AM, Marius Liebenberg mar...@mastercut.co.zawrote: Andy, I am busy with such a design. I think it is called an Orbital drive. I have not cut any parts yet but will start soon. Can you share your experiences with this idea? On 2013/11/03 12:53 AM, andy pugh wrote: On 2 November 2013 19:47, Stuart Stevenson stus...@gmail.com wrote: Andy, this is my idea of a rotary drive https://www.dropbox.com/s/jbc53qf9dx4cxjp/rotarycurvic.igs I think I tried to build something like that once, in fact I was hoping to use it in a product. Mine was an internal gear driving a spur gear with two teeth fewer. The idea was for the internally-toothed gear to wobble in a small circle. (driven by an eccentric on a motor). I was mainly trying for a very thin drive, at the time. I think we gave up on it eventually, as I had a plan B that involved a bit less invention. -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Hi Stuart Not harmonic Same concept of two gears - one with one less tooth than the other. All parts are solid - no flexing. Hmm, so I don't get it. The ratio is almost one so, right? Flo -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
http://en.wikipedia.org/wiki/Cycloidal_drive this link - with the 11 outer teeth (white) and 10 teeth on the center (moving yellow) gear - gives a 10 to 1 gear reduction between the input (green) shaft and the output (purple) shaft with finer teeth the reduction can be much higher On Sun, Nov 3, 2013 at 6:03 PM, Florian Rist fr...@fs.tum.de wrote: Hi Stuart Not harmonic Same concept of two gears - one with one less tooth than the other. All parts are solid - no flexing. Hmm, so I don't get it. The ratio is almost one so, right? Flo -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Andy, this is my idea of a rotary drive https://www.dropbox.com/s/jbc53qf9dx4cxjp/rotarycurvic.igs On Thu, Oct 31, 2013 at 8:49 PM, Stuart Stevenson stus...@gmail.com wrote: I went back and reread the previous emails and saw you called what we were working on 'enveloping'. I had not remembered that term. I am trying to see how to modify the curve to allow what you want. I have not seen a way yet. On Oct 31, 2013 6:19 PM, andy pugh bodge...@gmail.com wrote: On 31 October 2013 23:11, Stuart Stevenson stus...@gmail.com wrote: Describe your enveloping worm so I can try to model it. That is what we have been modelling earlier. (I am a bit confused) -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 2 November 2013 19:47, Stuart Stevenson stus...@gmail.com wrote: Andy, this is my idea of a rotary drive https://www.dropbox.com/s/jbc53qf9dx4cxjp/rotarycurvic.igs I think I tried to build something like that once, in fact I was hoping to use it in a product. Mine was an internal gear driving a spur gear with two teeth fewer. The idea was for the internally-toothed gear to wobble in a small circle. (driven by an eccentric on a motor). I was mainly trying for a very thin drive, at the time. I think we gave up on it eventually, as I had a plan B that involved a bit less invention. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
The inside plate (with the of gear profile) is meant to wobble on an eccentric but not spin. On Nov 2, 2013 5:56 PM, andy pugh bodge...@gmail.com wrote: On 2 November 2013 19:47, Stuart Stevenson stus...@gmail.com wrote: Andy, this is my idea of a rotary drive https://www.dropbox.com/s/jbc53qf9dx4cxjp/rotarycurvic.igs I think I tried to build something like that once, in fact I was hoping to use it in a product. Mine was an internal gear driving a spur gear with two teeth fewer. The idea was for the internally-toothed gear to wobble in a small circle. (driven by an eccentric on a motor). I was mainly trying for a very thin drive, at the time. I think we gave up on it eventually, as I had a plan B that involved a bit less invention. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Andy, Is this more like what you want? https://www.dropbox.com/s/7g46vdlz2svokn7/worm2.igs On Wed, Oct 30, 2013 at 2:47 PM, Stuart Stevenson stus...@gmail.com wrote: here is a more complete model for your enjoyment/critique https://www.dropbox.com/s/boyfgtldlw0kw8h/BallWormex2.igs On Wed, Oct 30, 2013 at 5:12 AM, Dave Caroline dave.thearchiv...@gmail.com wrote: Before anyone makes new rotaries, I have an interesting article from Summer school in electrical engineering, proceedings July 12 to 16 1948 BTH, The British Thomson-Houston Co Ltd Vibration and noise problems in engineering They were using an early spectrum analysis tool listening to the noise from a drive gear set made on a hobbing machine. http://www.collection.archivist.info/archive/proceedings/PR22/ see pages 60 61 and the table on page 66 The dominant error as you may see is regular error at tooth frequency A way I would put it is, if there were no accuracy errors there would be no sound to measure. Even the the measures they took to make the 360 master wheel still show up in the the result in table 1. The accuracy of a worm drive is also very important to telescope makers and to show the periodic error I mentioned earlier in this thread this page has some graphs http://www.pk3.org/Astro/index.htm?astrophoto_mount_errors.htm Just think how you are going to make your worm pitch match yout worm gear pcd to the accuracy needed. Hope it all goes well. Dave Caroline -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 31 October 2013 22:29, Stuart Stevenson stus...@gmail.com wrote: Andy, Is this more like what you want? https://www.dropbox.com/s/7g46vdlz2svokn7/worm2.igs That is a lot more like the JHU version, and maybe that is why they did it that way. But I am still more interested in trying the enveloping worm version. It should have more balls in play, but the actual contact area might turn out to be lower. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Describe your enveloping worm so I can try to model it. On Oct 31, 2013 6:04 PM, andy pugh bodge...@gmail.com wrote: On 31 October 2013 22:29, Stuart Stevenson stus...@gmail.com wrote: Andy, Is this more like what you want? https://www.dropbox.com/s/7g46vdlz2svokn7/worm2.igs That is a lot more like the JHU version, and maybe that is why they did it that way. But I am still more interested in trying the enveloping worm version. It should have more balls in play, but the actual contact area might turn out to be lower. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 31 October 2013 23:11, Stuart Stevenson stus...@gmail.com wrote: Describe your enveloping worm so I can try to model it. That is what we have been modelling earlier. (I am a bit confused) -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
I went back and reread the previous emails and saw you called what we were working on 'enveloping'. I had not remembered that term. I am trying to see how to modify the curve to allow what you want. I have not seen a way yet. On Oct 31, 2013 6:19 PM, andy pugh bodge...@gmail.com wrote: On 31 October 2013 23:11, Stuart Stevenson stus...@gmail.com wrote: Describe your enveloping worm so I can try to model it. That is what we have been modelling earlier. (I am a bit confused) -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Before anyone makes new rotaries, I have an interesting article from Summer school in electrical engineering, proceedings July 12 to 16 1948 BTH, The British Thomson-Houston Co Ltd Vibration and noise problems in engineering They were using an early spectrum analysis tool listening to the noise from a drive gear set made on a hobbing machine. http://www.collection.archivist.info/archive/proceedings/PR22/ see pages 60 61 and the table on page 66 The dominant error as you may see is regular error at tooth frequency A way I would put it is, if there were no accuracy errors there would be no sound to measure. Even the the measures they took to make the 360 master wheel still show up in the the result in table 1. The accuracy of a worm drive is also very important to telescope makers and to show the periodic error I mentioned earlier in this thread this page has some graphs http://www.pk3.org/Astro/index.htm?astrophoto_mount_errors.htm Just think how you are going to make your worm pitch match yout worm gear pcd to the accuracy needed. Hope it all goes well. Dave Caroline -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
here is a more complete model for your enjoyment/critique https://www.dropbox.com/s/boyfgtldlw0kw8h/BallWormex2.igs On Wed, Oct 30, 2013 at 5:12 AM, Dave Caroline dave.thearchiv...@gmail.comwrote: Before anyone makes new rotaries, I have an interesting article from Summer school in electrical engineering, proceedings July 12 to 16 1948 BTH, The British Thomson-Houston Co Ltd Vibration and noise problems in engineering They were using an early spectrum analysis tool listening to the noise from a drive gear set made on a hobbing machine. http://www.collection.archivist.info/archive/proceedings/PR22/ see pages 60 61 and the table on page 66 The dominant error as you may see is regular error at tooth frequency A way I would put it is, if there were no accuracy errors there would be no sound to measure. Even the the measures they took to make the 360 master wheel still show up in the the result in table 1. The accuracy of a worm drive is also very important to telescope makers and to show the periodic error I mentioned earlier in this thread this page has some graphs http://www.pk3.org/Astro/index.htm?astrophoto_mount_errors.htm Just think how you are going to make your worm pitch match yout worm gear pcd to the accuracy needed. Hope it all goes well. Dave Caroline -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Here is a model of the worm and table using the curve in the previous iges file https://www.dropbox.com/s/vq62ky4lmmr1nnc/ballwormex1.igs On Mon, Oct 28, 2013 at 9:00 PM, Gene Heskett ghesk...@wdtv.com wrote: On Monday 28 October 2013 21:51:14 Kent A. Reed did opine: On 10/28/2013 7:33 PM, Gene Heskett wrote: ... What do I use to translate that .igs to a format I can view? Does the file contain a part model (e.g. 3D) or a drawing (e.g. 2D)? IGES Viewer (http://igsviewer.com/) is pretty decent free 3D viewer but it was written for MS Windows. I haven't tried running it in Wine. AutoVue (http://www.oracle.com/technetwork/apps-tech/autovue/iges-viewer-082826. html) displays IGES 2D and 3D files decently. It isn't free but does have a free 30-day evaluation period. I think the same caveat about O/S applies but I haven't used it since long before Oracle took it over. Things may have changed. Most commercial CAD modelers have decent IGES import functions but I sense you don't have any of them. Regards, Kent You sense correctly I think, freecad, may be bits of heekscad, and qcad are about it. And pycam. Freecad loaded it, showed a very poor wireframe of the ball path of what may have been a inverse barrel shaped worm. pycam couldn't load it. Nor could qcad. -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clk trk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) The life which is unexamined is not worth living. -- Plato A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 29 October 2013 13:18, Stuart Stevenson stus...@gmail.com wrote: Here is a model of the worm and table using the curve in the previous iges file https://www.dropbox.com/s/vq62ky4lmmr1nnc/ballwormex1.igs Unfortunately Alibre refuses to render any teeth on the wheel, and AutoDesk Inventor crashes when trying to open the file. Which is all rather unsatisactory. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Try www.zw3d.com opens it fine, free 30 day trial version. Cheers, -Original Message- From: andy pugh [mailto:bodge...@gmail.com] Sent: 29 October 2013 09:42 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Rotary stage On 29 October 2013 13:18, Stuart Stevenson stus...@gmail.com wrote: Here is a model of the worm and table using the curve in the previous iges file https://www.dropbox.com/s/vq62ky4lmmr1nnc/ballwormex1.igs Unfortunately Alibre refuses to render any teeth on the wheel, and AutoDesk Inventor crashes when trying to open the file. Which is all rather unsatisactory. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 29 October 2013 20:33, Belli Button be...@iafrica.com wrote: Try www.zw3d.com opens it fine, free 30 day trial version. So, how did the teeth come out? -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
That is what is was created in. On Oct 29, 2013 3:51 PM, Belli Button be...@iafrica.com wrote: Try www.zw3d.com opens it fine, free 30 day trial version. Cheers, -Original Message- From: andy pugh [mailto:bodge...@gmail.com] Sent: 29 October 2013 09:42 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Rotary stage On 29 October 2013 13:18, Stuart Stevenson stus...@gmail.com wrote: Here is a model of the worm and table using the curve in the previous iges file https://www.dropbox.com/s/vq62ky4lmmr1nnc/ballwormex1.igs Unfortunately Alibre refuses to render any teeth on the wheel, and AutoDesk Inventor crashes when trying to open the file. Which is all rather unsatisactory. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
When you import using alibre, you can use the Import File Options, and check Heal, Make Tolerant and Discard Non-solid Faces. I don't know which one fixes it, but without them, it looks like the normals are inverted. -Original Message- From: andy pugh [mailto:bodge...@gmail.com] Sent: Wednesday, 30 October 2013 6:42 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Rotary stage On 29 October 2013 13:18, Stuart Stevenson stus...@gmail.com wrote: Here is a model of the worm and table using the curve in the previous iges file https://www.dropbox.com/s/vq62ky4lmmr1nnc/ballwormex1.igs Unfortunately Alibre refuses to render any teeth on the wheel, and AutoDesk Inventor crashes when trying to open the file. Which is all rather unsatisactory. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Do you have a design you can share? I would try to model it. On Oct 25, 2013 7:18 AM, andy pugh bodge...@gmail.com wrote: On 25 October 2013 08:15, Steve Blackmore st...@pilotltd.net wrote: The newer Vertex ones are nowhere near as good as the older ones and there are a lot of cheap copies out there too. I think that mine is one of the cheap copies. http://www.cnczone.com/forums/general_metal_working_machines/172314-servo_computer-numeric-control_conversion_vertex_bs0_dividing_head.html Backlash varies as it rotates, which is annoying. I did have plans to make a ball-worm for it, but after a fair bit of CAD modelling I don't think that they actually work. (This may be a fault with the CAD modelling, and I may still try generating the wheel to see what comes out) -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 28 October 2013 13:41, Stuart Stevenson stus...@gmail.com wrote: Do you have a design you can share? I would try to model it. The idea is stolen from: http://urobotics.urology.jhu.edu/projects/BW/ (I hate to think what a urology department intends to do with a ball worm) I was trying to model an enveloping version. Starting with a set of equally spaced points round a circle as the centre-lines of the balls. I ended up creating the waisted spiral as a set of points in Excel, joining them as a spline in Inventor, then using that as an extrude path to cut out the slots for on position of the worm. I then rotated that cut feature around the axis of the worm wheel. It soon became clear then the resulting tooth-spaces are not semicircular: https://picasaweb.google.com/lh/photo/z7gpHGfuYsP79pjRZ7xo4tMTjNZETYmyPJy0liipFm0?feat=directlink I think that the underlying problem is that the helix angle changes as the engagement radius changes. It may be that a suitably modified spiral can make it work. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 10/28/2013 08:41 AM, Stuart Stevenson wrote: Do you have a design you can share? I would try to model it. maybe of use from John Hopkins http://urobotics.urology.jhu.edu/pub/2006-stoianovici-uspto-07051610.pdf yeah its patented but you can make for for your own use cantcha? regards Tomp tjtr33 -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Are you engaging three ring gear teeth? Do you want a split nut for backlash adjustment? On Mon, Oct 28, 2013 at 9:01 AM, andy pugh bodge...@gmail.com wrote: On 28 October 2013 13:41, Stuart Stevenson stus...@gmail.com wrote: Do you have a design you can share? I would try to model it. The idea is stolen from: http://urobotics.urology.jhu.edu/projects/BW/ (I hate to think what a urology department intends to do with a ball worm) I was trying to model an enveloping version. Starting with a set of equally spaced points round a circle as the centre-lines of the balls. I ended up creating the waisted spiral as a set of points in Excel, joining them as a spline in Inventor, then using that as an extrude path to cut out the slots for on position of the worm. I then rotated that cut feature around the axis of the worm wheel. It soon became clear then the resulting tooth-spaces are not semicircular: https://picasaweb.google.com/lh/photo/z7gpHGfuYsP79pjRZ7xo4tMTjNZETYmyPJy0liipFm0?feat=directlink I think that the underlying problem is that the helix angle changes as the engagement radius changes. It may be that a suitably modified spiral can make it work. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 28 October 2013 14:33, Stuart Stevenson stus...@gmail.com wrote: Are you engaging three ring gear teeth? Do you want a split nut for backlash adjustment? I started off seeing if it was possible to engage a _lot_ of teeth. The fact that the balls can be inserted later means that the normal assembly problems of a very-enveloping worm can be avoided. However, the more teeth you try to engage the more the ball groove geometry is compromised. I was intending to use a gothic-arch profile as in a ball-screw and then adjust the centre distance to achieve a preload and zero backlash. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
With patents all that matters is the claims. Usually there is only one real claim and the rest of the claims are derivative of the first claim. In this case it looks like claim number one is very specific to a device that utilizes 3 design elements together. My guess is that the ball return path inside the worm is the truly new element. All the diagrams, description, and math are nice but they do not affect the actual claim. Steve Stallings -Original Message- From: TJoseph Powderly [mailto:tjt...@gmail.com] Sent: Monday, October 28, 2013 9:30 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Rotary stage On 10/28/2013 08:41 AM, Stuart Stevenson wrote: Do you have a design you can share? I would try to model it. maybe of use from John Hopkins http://urobotics.urology.jhu.edu/pub/2006-stoianovici-uspto-07 051610.pdf yeah its patented but you can make for for your own use cantcha? regards Tomp tjtr33 -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/414 0/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Mon, Oct 28, 2013 at 11:53 AM, Steve Stallings steve...@newsguy.com wrote: With patents all that matters is the claims. Usually there is only one real claim and the rest of the claims are derivative of the first claim. In this case it looks like claim number one is very specific to a device that utilizes 3 design elements together. My guess is that the ball return path inside the worm is the truly new element. I feel like I've seen this kind of worm drive before which would mean that the patent is probably invalid. Thanks for looking at the claims, most patents are written in such a way as to try to obfuscate what is being claimed. This person seems to have done quite a bit of research: http://www.unicopter.com/1509.html Not sure if any of the listed patents are still valid -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
Look up double enveloping (AKA double throated) worm gear. I'd like to see the machines made to cut those before any kind of NC or CNC was available. -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 10/28/2013 7:33 PM, Gene Heskett wrote: ... What do I use to translate that .igs to a format I can view? Does the file contain a part model (e.g. 3D) or a drawing (e.g. 2D)? IGES Viewer (http://igsviewer.com/) is pretty decent free 3D viewer but it was written for MS Windows. I haven't tried running it in Wine. AutoVue (http://www.oracle.com/technetwork/apps-tech/autovue/iges-viewer-082826.html) displays IGES 2D and 3D files decently. It isn't free but does have a free 30-day evaluation period. I think the same caveat about O/S applies but I haven't used it since long before Oracle took it over. Things may have changed. Most commercial CAD modelers have decent IGES import functions but I sense you don't have any of them. Regards, Kent -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
the part is a 3D model - points and a curve On Mon, Oct 28, 2013 at 7:00 PM, Kent A. Reed kentallanr...@gmail.comwrote: On 10/28/2013 7:33 PM, Gene Heskett wrote: ... What do I use to translate that .igs to a format I can view? Does the file contain a part model (e.g. 3D) or a drawing (e.g. 2D)? IGES Viewer (http://igsviewer.com/) is pretty decent free 3D viewer but it was written for MS Windows. I haven't tried running it in Wine. AutoVue ( http://www.oracle.com/technetwork/apps-tech/autovue/iges-viewer-082826.html ) displays IGES 2D and 3D files decently. It isn't free but does have a free 30-day evaluation period. I think the same caveat about O/S applies but I haven't used it since long before Oracle took it over. Things may have changed. Most commercial CAD modelers have decent IGES import functions but I sense you don't have any of them. Regards, Kent -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. Just for you NSA - think autointercourse terrorist suitcase bomb sarin hello -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Thu, 2013-10-24 at 19:27 +0100, andy pugh wrote: On 24 October 2013 19:00, Tomaz T. tomaz_...@hotmail.com wrote: Does anyone here have any experience with chinese motorized rotary stages, like this one: http://www.alibaba.com/product-gs/615993083/LSDH_100WS_Worm_gear_motorized_rotary.html The maximum static torque quoted sounds rather wrong. I'm a bit worried about actual accuracy and amount of backlash. If it would be worth of buying it... anyway, is there a way to have actual position feedback from table, not only from motor (in case of servo motor) ... I mean retrofitting it with a kind of encoder? All things are possible. Simplest might be a magnetic tape scale around the outside. http://www.machine-dro.co.uk/digital-readout-systems/magnetic-linear-encoder-reading-head-25-micron-resolution.html Better would be: http://www.renishaw.com/en/resolute-rotary-angle-absolute-encoder-options--10939 But I suspect if you were in that market you wouldn't be looking at Chinese rotaries. If you don't need the through-hole then you could easily hide an encoder in there. And a 2500 cpr encoder mounted coaxially would seem to give usable resolution. I've not tried this but have been tempted a few times when using a manually rotated indexer. Dave -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Fri, 25 Oct 2013 13:14:34 +0100, you wrote: On 25 October 2013 08:15, Steve Blackmore st...@pilotltd.net wrote: The newer Vertex ones are nowhere near as good as the older ones and there are a lot of cheap copies out there too. I think that mine is one of the cheap copies. http://www.cnczone.com/forums/general_metal_working_machines/172314-servo_computer-numeric-control_conversion_vertex_bs0_dividing_head.html Backlash varies as it rotates, which is annoying. Running with lapping paste should sort that - takes some time though. I've also got some rotary units out of a high end satellite/radar tracking dish - the split pinions are similar to these http://www.hpcgears.com/products/anti_backlash_wormwheels.htm but with springs in slots as in a clutch driven plate. Not sure how they would behave with non linear cutting forces on them though. Large Meade telescopes use a similar split pinion, the worm drive and motor mount is interesting though, it's on spring loaded arm that pushes it into engagement and takes up any lack of concentricity. I did have plans to make a ball-worm for it, but after a fair bit of CAD modelling I don't think that they actually work. (This may be a fault with the CAD modelling, and I may still try generating the wheel to see what comes out) Be interested to see that Andy. Steve Blackmore -- -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On Fri, 25 Oct 2013 07:54:00 +0200, you wrote: I can concur with Dave about the Vertex table. I found it to be very good and you can adjust the engagement of the worm gear. I know many guys that use them all with great results. The newer Vertex ones are nowhere near as good as the older ones and there are a lot of cheap copies out there too. Adjustable engagement is a must. Bearings on the rotor and worm shaft are highly desirable if you are going to CNC one. A lot are just cast iron plain bored, and badly too. I've CNC'd a few over the years, the one I use now is a Shoba, problem is they don't make anything, they buy in and sell under their name and quality varies hugely. I made a new worm and drive shaft, the pinion was OK but the worm thread was crap and made of butter. I also added thrust and roller bearings to the new worm shaft. I ran it in with an electric drill and fine lapping paste on the teeth for a couple of hours in both directions and backlash is negligible now. Even so, as Dave said, it's better to run the code in one direction where possible :) Steve Blackmore -- -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 25 October 2013 08:15, Steve Blackmore st...@pilotltd.net wrote: The newer Vertex ones are nowhere near as good as the older ones and there are a lot of cheap copies out there too. I think that mine is one of the cheap copies. http://www.cnczone.com/forums/general_metal_working_machines/172314-servo_computer-numeric-control_conversion_vertex_bs0_dividing_head.html Backlash varies as it rotates, which is annoying. I did have plans to make a ball-worm for it, but after a fair bit of CAD modelling I don't think that they actually work. (This may be a fault with the CAD modelling, and I may still try generating the wheel to see what comes out) -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
On 24 October 2013 19:00, Tomaz T. tomaz_...@hotmail.com wrote: Does anyone here have any experience with chinese motorized rotary stages, like this one: http://www.alibaba.com/product-gs/615993083/LSDH_100WS_Worm_gear_motorized_rotary.html The maximum static torque quoted sounds rather wrong. I'm a bit worried about actual accuracy and amount of backlash. If it would be worth of buying it... anyway, is there a way to have actual position feedback from table, not only from motor (in case of servo motor) ... I mean retrofitting it with a kind of encoder? All things are possible. Simplest might be a magnetic tape scale around the outside. http://www.machine-dro.co.uk/digital-readout-systems/magnetic-linear-encoder-reading-head-25-micron-resolution.html Better would be: http://www.renishaw.com/en/resolute-rotary-angle-absolute-encoder-options--10939 But I suspect if you were in that market you wouldn't be looking at Chinese rotaries. If you don't need the through-hole then you could easily hide an encoder in there. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
This one has a bit more specs about accuracy... if I could trust them :I http://bjwn.en.alibaba.com/product/215200677-200438444/Motorized_Rotation_Stage.html On this rotary stage sizes is usually nema 17 frame size, so with 1:180 ratio I could expect minimum 40Nm of torque?Isn't usually there a mechanism that allows to tighten worm against worm wheel to reduce backlash? That device has a resolution and a repeatability specifications but no accuracy which worries me. A few years ago I measured some rotary tables and found most of them were useless for the job we were doing due to periodic error due to the worm to wormwheel engagement, a basic sawtooth error which in one case was nearly .75 of a degree. Currently on my 5 axis I use a Vertex brand rotary (Taiwan) which has a 90-1 worm. So far for clock gears it has been good enough but I have not measured the accuracy beyond checking the resulting manufactured gear pitches. To provoke the error from a worm cut a gear of much higher number number than the internal worm. Simple check is, get a digital vernier, pick a number of teeth to measure over, measure , zero the vernier, then step around the gear, any time the vernier reads negative zero it, repeat till you get a lap just positive and record the peak distance, should be very small for a good rotary. I have seen some terrible variation from some rotaries. Backlash in these low cost rotaries I avoid by writing directional gcode. Dave Caroline -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Rotary stage
I can concur with Dave about the Vertex table. I found it to be very good and you can adjust the engagement of the worm gear. I know many guys that use them all with great results. On 2013/10/25 01:00 AM, Dave Caroline wrote: On 24/10/2013, Tomaz T. tomaz_...@hotmail.com wrote: Does anyone here have any experience with chinese motorized rotary stages, like this one: http://www.alibaba.com/product-gs/615993083/LSDH_100WS_Worm_gear_motorized_rotary.html I'm a bit worried about actual accuracy and amount of backlash. If it would That device has a resolution and a repeatability specifications but no accuracy which worries me. A few years ago I measured some rotary tables and found most of them were useless for the job we were doing due to periodic error due to the worm to wormwheel engagement, a basic sawtooth error which in one case was nearly .75 of a degree. Currently on my 5 axis I use a Vertex brand rotary (Taiwan) which has a 90-1 worm. So far for clock gears it has been good enough but I have not measured the accuracy beyond checking the resulting manufactured gear pitches. To provoke the error from a worm cut a gear of much higher number number than the internal worm. Simple check is, get a digital vernier, pick a number of teeth to measure over, measure , zero the vernier, then step around the gear, any time the vernier reads negative zero it, repeat till you get a lap just positive and record the peak distance, should be very small for a good rotary. I have seen some terrible variation from some rotaries. Backlash in these low cost rotaries I avoid by writing directional gcode. Dave Caroline -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60135991iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
