Re: [Emc-users] rotary table .... has anyone tried this?
On Sun, 2013-11-03 at 06:28 -0500, Mark Wendt wrote: > Only issue I can see here in this configuration is with tensioning both > idlers. If the motor is spinning in either direction, one idler is always > going to be tightening the belt, and the other is going to try to be > loosening due to driving forces acting on the idler from the belt and the > smaller pinion gear acting on the larger gear. > > How does one account for that, ensuring the belt stays in tension? > > Mark > Idler on the lower loop (in the diagram) > Dave > > On Sat, Nov 2, 2013 at 1:19 PM, Tomaz T. wrote: > > > Dave, > > Tomaz's picture was interesting > > if 2 idlers are used > > the opposing tension is kinda anit-backlash > > and I'd try mounting encoder on one of the 2 tensed gears > > ( if you couldnt mount on axis proper, requiring thru hole ) > > regards > > TomP > > > > > > I think there should be something in between two pulleys, because it would > > be difficult to match belt length just right. That also means sacrificing > > trough hole... > > > > Could this work?: > > http://picpaste.com/pics/Gearing_02-qYmummoI.1383412496.jpg > > > > -- > > 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=65839951&iu=/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=65839951&iu=/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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
I would not use a spring tensioner but rather tension the belt to a permanent fixed tension. Just check it on a regular basis. My experience with spring tensioners is that they will produce backlash or movement because they can. A good belt will have no stretch or very little over the short distance that we talk about here. On 2013/11/03 01:28 PM, Mark Wendt wrote: > Only issue I can see here in this configuration is with tensioning both > idlers. If the motor is spinning in either direction, one idler is always > going to be tightening the belt, and the other is going to try to be > loosening due to driving forces acting on the idler from the belt and the > smaller pinion gear acting on the larger gear. > > How does one account for that, ensuring the belt stays in tension? > > Mark > > > On Sat, Nov 2, 2013 at 1:19 PM, Tomaz T. wrote: > >> Dave, >> Tomaz's picture was interesting >> if 2 idlers are used >> the opposing tension is kinda anit-backlash >> and I'd try mounting encoder on one of the 2 tensed gears >> ( if you couldnt mount on axis proper, requiring thru hole ) >> regards >> TomP >> >> >> I think there should be something in between two pulleys, because it would >> be difficult to match belt length just right. That also means sacrificing >> trough hole... >> >> Could this work?: >> http://picpaste.com/pics/Gearing_02-qYmummoI.1383412496.jpg >> >> -- >> 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=65839951&iu=/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=65839951&iu=/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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
Only issue I can see here in this configuration is with tensioning both idlers. If the motor is spinning in either direction, one idler is always going to be tightening the belt, and the other is going to try to be loosening due to driving forces acting on the idler from the belt and the smaller pinion gear acting on the larger gear. How does one account for that, ensuring the belt stays in tension? Mark On Sat, Nov 2, 2013 at 1:19 PM, Tomaz T. wrote: > Dave, > Tomaz's picture was interesting > if 2 idlers are used > the opposing tension is kinda anit-backlash > and I'd try mounting encoder on one of the 2 tensed gears > ( if you couldnt mount on axis proper, requiring thru hole ) > regards > TomP > > > I think there should be something in between two pulleys, because it would > be difficult to match belt length just right. That also means sacrificing > trough hole... > > Could this work?: > http://picpaste.com/pics/Gearing_02-qYmummoI.1383412496.jpg > > -- > 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=65839951&iu=/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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
Dave, Tomaz's picture was interesting if 2 idlers are used the opposing tension is kinda anit-backlash and I'd try mounting encoder on one of the 2 tensed gears ( if you couldnt mount on axis proper, requiring thru hole ) regards TomP I think there should be something in between two pulleys, because it would be difficult to match belt length just right. That also means sacrificing trough hole... Could this work?: http://picpaste.com/pics/Gearing_02-qYmummoI.1383412496.jpg -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
On 11/02/2013 11:13 AM, dave wrote: On Sat, 2013-11-02 at 09:19 +, Steve Blackmore wrote: On Fri, 01 Nov 2013 08:22:26 -0700, you wrote: Hi all, I've often wondered how well a rotary table would work if driven by a reasonably stiff timing belt. Say 1" urethane with steel fibers. Gearing would be approx 5:1 and then a reducer if necessary to couple to the servo motor. Encoder would be mounted on an idler wheel driven by the 1" belt. I use a similar encoder setup on the Z axis of my mill and it seems to give rather good control at ~ 100K counts/inch. ;-) Has anyone tried this or something similar and what were the results. Stiff enough? Accurate enough? Of course everyone's definition of adequate is different but was it good enough to be usable? ... snip ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Dave, Tomaz's picture was interesting if 2 idlers are used the opposing tension is kinda anit-backlash and I'd try mounting encoder on one of the 2 tensed gears ( if you couldnt mount on axis proper, requiring thru hole ) regards TomP <>-- 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=65839951&iu=/4140/ostg.clktrk___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
On Sat, 2013-11-02 at 09:19 +, Steve Blackmore wrote: > On Fri, 01 Nov 2013 08:22:26 -0700, you wrote: > > >Hi all, > > > >I've often wondered how well a rotary table would work if driven by a > >reasonably stiff timing belt. Say 1" urethane with steel fibers. > >Gearing would be approx 5:1 and then a reducer if necessary to couple to > >the servo motor. Encoder would be mounted on an idler wheel driven by > >the 1" belt. I use a similar encoder setup on the Z axis of my mill and > >it seems to give rather good control at ~ 100K counts/inch. ;-) > > > >Has anyone tried this or something similar and what were the results. > >Stiff enough? Accurate enough? Of course everyone's definition of > >adequate is different but was it good enough to be usable? > > Timing belts will work accuracy wise on positioning, but stopping > cutting forces being directly passed back to the drive is a problem. > > That's why worm and pinion type gearing is used, and you have to be > careful with that. I did some development work using worm and pinion > gearboxes and under 30:1 it was possible to back drive the input shaft. > Over that they were self locking. > > Steve Blackmore > -- Thanks Steve. That was the information I was looking for. My application has pretty light loads so it might still work but there are no guarantees. Andy .. so why use a fancy resolver unless you really need the ruggedness? It is so easy to just attach a high res encoder to linuxcnc. :-) I appreciate all the feedback and discussion. Dave > > -- > 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=65839951&iu=/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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
>> are there any major advantages over encoders in this case of installation? > > If you can sample for long enough your resolution is infinite. (or, at > least, better than your ADC) > > So, 16 bits of position information is easy and you can have a lot more. > > Plus all the other resolver advantages (they work when full of > coolant, you can't break them) and disadvantages (awkward to > interface, horribly expensive) > > The Tamagawa web site is very proud of the fact that they have a > design that can be wound by machine rather than by hand. > I was thinking of installing encoder on final stage of gearing instead on beck of servo, if there would be any benefits concerning accuracy/backlash. -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
On Fri, 01 Nov 2013 08:22:26 -0700, you wrote: >Hi all, > >I've often wondered how well a rotary table would work if driven by a >reasonably stiff timing belt. Say 1" urethane with steel fibers. >Gearing would be approx 5:1 and then a reducer if necessary to couple to >the servo motor. Encoder would be mounted on an idler wheel driven by >the 1" belt. I use a similar encoder setup on the Z axis of my mill and >it seems to give rather good control at ~ 100K counts/inch. ;-) > >Has anyone tried this or something similar and what were the results. >Stiff enough? Accurate enough? Of course everyone's definition of >adequate is different but was it good enough to be usable? Timing belts will work accuracy wise on positioning, but stopping cutting forces being directly passed back to the drive is a problem. That's why worm and pinion type gearing is used, and you have to be careful with that. I did some development work using worm and pinion gearboxes and under 30:1 it was possible to back drive the input shaft. Over that they were self locking. Steve Blackmore -- -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
On 11/1/2013 9:22 AM, dave wrote: > Hi all, > > I've often wondered how well a rotary table would work if driven by a > reasonably stiff timing belt. Say 1" urethane with steel fibers. > Gearing would be approx 5:1 and then a reducer if necessary to couple to > the servo motor. Encoder would be mounted on an idler wheel driven by > the 1" belt. I use a similar encoder setup on the Z axis of my mill and > it seems to give rather good control at ~ 100K counts/inch. ;-) You'd need a shield or cover to keep chips from getting between the belt and pulleys, but other than that it should work. Cogged belts have been used on some heavy equipment and precision drives on milling machines. -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
On 1 November 2013 22:00, Tomaz T. wrote: > are there any major advantages over encoders in this case of installation? If you can sample for long enough your resolution is infinite. (or, at least, better than your ADC) So, 16 bits of position information is easy and you can have a lot more. Plus all the other resolver advantages (they work when full of coolant, you can't break them) and disadvantages (awkward to interface, horribly expensive) The Tamagawa web site is very proud of the fact that they have a design that can be wound by machine rather than by hand. -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
> There are lots of resolvers on eBay. But I am not keen to look up the > specs of every one to figure out if they are multi-pole. > are there any major advantages over encoders in this case of installation? -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
On 1 November 2013 19:39, Tomaz T. wrote: >> But, with a nice multi-pole resolver directly coupled to the table, >> none of those would matter. >> > can you suggest any? There are lots of resolvers on eBay. But I am not keen to look up the specs of every one to figure out if they are multi-pole. -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
> But, with a nice multi-pole resolver directly coupled to the table, > none of those would matter. > can you suggest any? -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
On 1 November 2013 19:02, Dave Caroline wrote: > small gears to large gear (involute error) > basic belt accuracy or not (although this is divided and reduced) > belt to belt timing pulley backlash But, with a nice multi-pole resolver directly coupled to the table, none of those would matter. -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
Interesting idea- kind of a planetary reducer with a belt. But be aware that one does not incorporate *spring* tensioners in multi-directional systems. Best regards, -- -- Glenn Rapid Converting LLC gl...@rapidconverting.com www.rapidgasket.com On Fri, Nov 1, 2013 at 11:45 AM, Tomaz T. wrote: > This could be solution to gain gearing ratio in combination with timing > belt... > > Where would you place tensioner(s) to get rid of backlash ... ? > > http://picpaste.com/pics/Gearing_01-X1NbZKYn.1383331283.jpg > > -- > 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=65839951&iu=/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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
On 01/11/2013, Tomaz T. wrote: > This could be solution to gain gearing ratio in combination with timing > belt... > > Where would you place tensioner(s) to get rid of backlash ... ? > > http://picpaste.com/pics/Gearing_01-X1NbZKYn.1383331283.jpg I am inclined to say now you have three problems with that arrangement small gears to large gear (involute error) basic belt accuracy or not (although this is divided and reduced) belt to belt timing pulley backlash Your backlash of the small gears can be adjusted with an idler on the timing belt between the two larger timing pulleys 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
This could be solution to gain gearing ratio in combination with timing belt... Where would you place tensioner(s) to get rid of backlash ... ? http://picpaste.com/pics/Gearing_01-X1NbZKYn.1383331283.jpg -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
I would like someone to characterize belt error (I dont have any belt system) I did some googling when the original rotary thread started for toothed belt accuracy and didnt find anything sensible as timing belts are generally designed to transmit power (lots of information on the power transmission abilities). Dave Caroline On 01/11/2013, Kirk Wallace wrote: > On 11/01/2013 08:22 AM, dave wrote: >> Hi all, >> >> I've often wondered how well a rotary table would work if driven by a >> reasonably stiff timing belt. Say 1" urethane with steel fibers. >> Gearing would be approx 5:1 and then a reducer if necessary to couple to >> the servo motor. Encoder would be mounted on an idler wheel driven by >> the 1" belt. I use a similar encoder setup on the Z axis of my mill and >> it seems to give rather good control at ~ 100K counts/inch. ;-) >> >> Has anyone tried this or something similar and what were the results. >> Stiff enough? Accurate enough? Of course everyone's definition of >> adequate is different but was it good enough to be usable? >> >> Many thanks in advance. >> >> Dave > > I haven't tried it, but this belt arrangement comes to mind: > http://www.rockcliffcnc.com/SiteImages/CNC%20ROUTER%20BELT%20DRIVE%20ROCKCLIFF.jpg > > The picture above is similar to the mechanism I'm thinking of, which > uses a rack with the form of the belt and the span between the pinion > and the idler wheels is closed until they touch, or nearly so. The > amount of belt involved is between where each idler touches the rack > (with the belt in between) and where it touches the pinion. There should > be very little flex. This should work as well with a pulley replacing > the rack. > > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/ > > -- > 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=65839951&iu=/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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] rotary table .... has anyone tried this?
On 11/01/2013 08:22 AM, dave wrote: > Hi all, > > I've often wondered how well a rotary table would work if driven by a > reasonably stiff timing belt. Say 1" urethane with steel fibers. > Gearing would be approx 5:1 and then a reducer if necessary to couple to > the servo motor. Encoder would be mounted on an idler wheel driven by > the 1" belt. I use a similar encoder setup on the Z axis of my mill and > it seems to give rather good control at ~ 100K counts/inch. ;-) > > Has anyone tried this or something similar and what were the results. > Stiff enough? Accurate enough? Of course everyone's definition of > adequate is different but was it good enough to be usable? > > Many thanks in advance. > > Dave I haven't tried it, but this belt arrangement comes to mind: http://www.rockcliffcnc.com/SiteImages/CNC%20ROUTER%20BELT%20DRIVE%20ROCKCLIFF.jpg The picture above is similar to the mechanism I'm thinking of, which uses a rack with the form of the belt and the span between the pinion and the idler wheels is closed until they touch, or nearly so. The amount of belt involved is between where each idler touches the rack (with the belt in between) and where it touches the pinion. There should be very little flex. This should work as well with a pulley replacing the rack. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] rotary table .... has anyone tried this?
Hi all, I've often wondered how well a rotary table would work if driven by a reasonably stiff timing belt. Say 1" urethane with steel fibers. Gearing would be approx 5:1 and then a reducer if necessary to couple to the servo motor. Encoder would be mounted on an idler wheel driven by the 1" belt. I use a similar encoder setup on the Z axis of my mill and it seems to give rather good control at ~ 100K counts/inch. ;-) Has anyone tried this or something similar and what were the results. Stiff enough? Accurate enough? Of course everyone's definition of adequate is different but was it good enough to be usable? Many thanks in advance. Dave -- 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=65839951&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
