Re: [Emc-users] BeagleBone Image Available
On 9/3/2013 3:24 AM, Charles Steinkuehler wrote: On 9/2/2013 7:14 PM, Kirk Wallace wrote: On 09/02/2013 03:38 PM, Charles Steinkuehler wrote: I have a new version of the MachineKit image for running LinuxCNC on a BeagleBone available: Image: http://bb-lcnc.blogspot.com/p/machinekit_16.html Announcement: http://bb-lcnc.blogspot.com/2013/09/new-machinekit-image-available.html This is a fairly significant change from the previous versions, as I am now building the kernel fully from source (pulling in the required Xenomai code from git) and I have switched to the unified-build-candidate branch of LinuxCNC (which is going to become 2.6?). Anyway, if anyone has an interest in playing with LinuxCNC on the BeagleBone give it a whirl and let me know how it works for you. It moves motors for me, but I have made enough changes I'd like as much testing as possible. Thanks! Is there a brain dead install document or a list of things one would need to learn to do an installation? The wiki pages look like they were last updated in March? Which wiki pages? My blog page with the image download should have enough to get you going if you have some Linux experience and can figure out the device representing your SD card reader: http://bb-lcnc.blogspot.com/p/machinekit_16.html Hi, I bought a BBB card for using on my little MF70 CNC. I am looking for a while on internet but did not found anything about using a BBB with a cape or connection to emulate the parallel port by BBB GPIO. I have seen the BeBoPr or K9 Smorgasboard that emulates the parallel port but there is not an inexpensive solution ? Only some logic level converters? Also it will be nice to have a small touch screen to be used with axis , some advicez . I am thinking as variant to use a android tablet with an x11 server app Paul -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
An important spec to look for in any motor is the stall torque to give an idea of its ability to move a dead load like a machine table that also has stiction (stationary friction) and any other load on the table to overcome. Note power is the product of torque and rpm the formulas are on http://www.engineeringtoolbox.com/electrical-motors-hp-torque-rpm-d_1503.html including some example motor ratings Use a motor man enough for the job This is from a user who is about to rebuild the X slide due to friction problems when static Dave Caroline On Thu, Sep 5, 2013 at 5:40 AM, Gregg Eshelman g_ala...@yahoo.com wrote: On Wed, 9/4/13, Jack Coats j...@coats.org wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Date: Wednesday, September 4, 2013, 8:18 PM From what I have been told, the Amps is the 'power', but more volts is the 'speed' and responsiveness component. Watts is Volts times Amps, and is defined as 'power'. The 'torque' would be more the 'amps' than power, but obviously they are related. Does that help? -- What I'm looking for is for each type of motor (AC and BLDC) is You want at least x watts and n amps to at least be in the same range as the old motor. On cncdrives.com I noticed the torque values listed are different for AC and DC motors of the same watts. The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM 2400. Max voltage 140 DC. I don't know how much the table and saddle weigh, but having had the table and saddle off a slightly smaller Lagun to do long overdue cleaning and nut replacement, I know it's a rather large number of pounds or kilos. There's some videos on youtube of old Anilam Crusader M systems on knee mills, presumably with 140V brush DC motors like these, and they don't appear to be too sprightly. Have a look at this. It's a bed mill, it must have some real powerful motors to move that fast. http://www.youtube.com/watch?v=E3AqIZURMbI I don't expect a knee mill to be that fast, but it should be able to be at least somewhat quicker than it was out the factory door 23 years ago, with newer motors and control systems. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
Am 05.09.2013 um 08:28 schrieb Paul Lacatus p...@paul-lacatus.ro: On 9/3/2013 3:24 AM, Charles Steinkuehler wrote: On 9/2/2013 7:14 PM, Kirk Wallace wrote: On 09/02/2013 03:38 PM, Charles Steinkuehler wrote: I have a new version of the MachineKit image for running LinuxCNC on a BeagleBone available: Image: http://bb-lcnc.blogspot.com/p/machinekit_16.html Announcement: http://bb-lcnc.blogspot.com/2013/09/new-machinekit-image-available.html This is a fairly significant change from the previous versions, as I am now building the kernel fully from source (pulling in the required Xenomai code from git) and I have switched to the unified-build-candidate branch of LinuxCNC (which is going to become 2.6?). Anyway, if anyone has an interest in playing with LinuxCNC on the BeagleBone give it a whirl and let me know how it works for you. It moves motors for me, but I have made enough changes I'd like as much testing as possible. Thanks! Is there a brain dead install document or a list of things one would need to learn to do an installation? The wiki pages look like they were last updated in March? Which wiki pages? My blog page with the image download should have enough to get you going if you have some Linux experience and can figure out the device representing your SD card reader: http://bb-lcnc.blogspot.com/p/machinekit_16.html Hi, I bought a BBB card for using on my little MF70 CNC. I am looking for a while on internet but did not found anything about using a BBB with a cape or connection to emulate the parallel port by BBB GPIO. I have seen the BeBoPr or K9 Smorgasboard that emulates the parallel port but there is not an inexpensive solution ? Only some logic level converters? that'd be very useful to have, I guess many people could make use of such a cape I heard Alex Joni thinking aloud about creating one.. Alex? next best thing is buying a breakout cape like this: http://www.adafruit.com/products/572 and grabbing the soldering iron ;) - Michael Also it will be nice to have a small touch screen to be used with axis , some advicez . I am thinking as variant to use a android tablet with an x11 server app Paul -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Control refit options - best economical servo amp for this application?
Hello group; An old friend contacted me recently about problems he has been having with his hobby mill. I say hobby because the man is a top notch surgeon who does mainly reconstruction of destroyed hands. His hobby mill looks to be a late 70's vintage CNC knee mill with a 2 or 3 hp Universal 300 qwik switch spindle. The control CRT is long gone and a BW 7 inch hand held TV is strapped in place using composite RCA video. I'm guessing a Z80A cpu. The Mill has Baldor servos as follows; ModelM-4060-FL-43 Mfg Code 16/190 81633 Max Current25A Torque Stall350 oz inch Max Speed2500 RPM Max Volt120 VDC Baldor servo amps Model UM3012-100 Part # 990122C-00. These are +/- 10V analog with tach velocity feedback. I measure 100VDC at the power supply capacitor. This machine came as a 4 axis but he claims the 4th unit was a basket case when he received it and he just kept the extra amp mounted as a spare. Recently the Y axis had problems so he moved the wiring from that amp to the A axis amp, Now the X is giving him fits and he is blaming the amps but I think the control may be failing. While I was there he set the home offset, and about 15 minutes later that value was missing for X. What he would like to do is replace the amps and control, re-using servos and existing limit switch wiring and power supplies. I looked at Copley and I didn't see anything that looked close. AMC looks like a good contender with the 25A20I. Any others I should look at? I would like to use that tach feedback if possible as this machine may have rather low count encoders and I don't want to touch them at all. I will likely use one of the 5i25 combo's for I/O. I am considering showing him touchy but I have not used it myself as yet so it will be alot more extra homework for me. I also want to try and use the baldor amps at first to prove out limits, homing etc. I get the feeling that his amps are far out of tune due to him meddling with all the trims pots. I will need lots of help with guessing accelspecs and other initial settings, I will likely be very well versed in some areas of using HAL to get things functional. Worse yet - it looks like MY mill may have just given up the ghost also, so that machine may be inline for a refit too. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Control refit options - best economical servo amp for this application?
On Thu, 9/5/13, Greg Bentzinger skullwo...@yahoo.com wrote: Hello group; An old friend contacted me recently about problems he has been having with his hobby mill. I say hobby because the man is a top notch surgeon who does mainly reconstruction of destroyed hands. His hobby mill looks to be a late 70's vintage CNC knee mill with a 2 or 3 hp Universal 300 qwik switch spindle. The control CRT is long gone and a BW 7 inch hand held TV is strapped in place using composite RCA video. I'm guessing a Z80A cpu. The Mill has Baldor servos as follows; ModelM-4060-FL-43 Mfg Code 16/190 81633 Max Current25A Torque Stall350 oz inch Max Speed2500 RPM Max Volt120 VDC - He's in the same boat I'm in. High voltage DC motors and new or new-er amps to drive them are hideously expensive. But a surgeon, you say? That usually means a person of means. I couldn't get around the cost of replacing one missing old amp and then coming up with the hardware to control it - and then always the worry that one of the nearly quarter century old amps would go *poof*, just like lighting $500 on fire. If they were under 100 volts there's plenty of amps or drivers on eBay, but get over 100 volts and there's not much. (I spent a lot of time on there looking for more up to date drives capable of handling 140 volt DC motors.) He'll be best off buying a new kit of motors and drivers with all the wiring. They usually include some cheap Chinese BOB. Use it to get it set up then toss it and get compatible gear from Mesa or Pico or one of the other guys who posts here. If you can afford it, all new is the best because A. It's supposed to work. B. If it doesn't work you can exchange it. If he does want to pinch a few pennies, there's a seller on eBay going by FA-PARTS, selling kits with used drivers and motors, all tested, with all the connectors, wiring diagram and software in English, and a cheap Chinese BOB. The connectors have been cut off of cables so wiring is up to the buyer. (I'm thinking of buying a kit from FA-PARTS but it'll have my investment in the mill over $2,000, dagnabit!) Might be able to part out the old system to recover some of the cost. I've brought in about $700 on old Anilam Crusader M pieces and still have some of it left. Curiously, no bids on the amps at a starting bid of $100. My sights (and budget) are set a bit lower. Still looking at options with NEMA34 size motors - and going to have to have someone else make plates to adapt a NEMA34 mount to a 4 on 75mm bolt circle. That's something your Dr. friend can do before his mill goes dead. Settle on what sort of motors to use then get adapters made. If he doesn't want that 4th axis, I'd be happy to take it off his hands. :-) -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On 5 September 2013 05:40, Gregg Eshelman g_ala...@yahoo.com wrote: The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM 2400. Max voltage 140 DC 140V * 30A = 4200W 140V * 5.8A = 800W 3Nm * 2400 rpm = 750W You probably want at least 750W motors, geared to suit any difference in nominal motor speed. My small knee mill seems pretty reasonable with 750W brushless servos. Though I suspect that I am limited by software commutation at that top speed end. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
On Wed, Sep 4, 2013 at 2:15 PM, Kirk Wallace kwall...@wallacecompany.comwrote: On 09/04/2013 09:56 AM, Kirk Wallace wrote: ... snip I tried AXIS but got: http://www.wallacecompany.com/machine_shop/LinuxCNC/Screenshot-3.png so I guess AXIS doesn't work with the BBB. Now, on to integrating real hardware. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ Kirk, That's not a LinuxCNC/Axis error, that's an X error. There should be something in the X logs that point to the problem. Look in your home directory for the .xsession-errors file. Should say in there what parameter caused the X window to barf. Mark -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
On Thu, Sep 5, 2013 at 2:55 AM, emc-users-requ...@lists.sourceforge.netwrote: I bought a BBB card for using on my little MF70 CNC. I am looking for a while on internet but did not found anything about using a BBB with a cape or connection to emulate the parallel port by BBB GPIO. I have seen the BeBoPr or K9 Smorgasboard that emulates the parallel port but there is not an inexpensive solution ? Only some logic level converters? Also it will be nice to have a small touch screen to be used with axis , some advicez . I am thinking as variant to use a android tablet with an x11 server app Paul All of the signals needed (xstep, xdir etc..) are present on the BBB's GPIO headers at 3.3v level but are very limited to the amount of current they can drive/source. If are familiar with electronics you could get the prototype cape and wire up some I/O line drivers to them and connect right to your stepper drivers and with Charles' MachineKit image be good to go. The BeBoPr just does the same thing but adds the MOSFET's to control a 3D printer's heated bed etc... Also, the abitlity to connect a touch-screen is there as well. I believe the drivers in linux are availble to read the input from it as well. It would be nice though if there was such a Parallel Port Breakout type board pre-made for those that need that option and provided the connectors ready to be wired up.. Bob -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Control refit options - best economical servo amp for this application?
On 5 September 2013 08:11, Greg Bentzinger skullwo...@yahoo.com wrote: What he would like to do is replace the amps and control, re-using servos and existing limit switch wiring and power supplies. ... I will likely use one of the 5i25 combo's for I/O. I am considering showing him touchy but I have not used it myself as yet so it will be alot more extra homework for me. For DC servos I would either be looking at second-hand AMC drives from eBay/ New I would be looking at Granite Devices, or the properly dumb drives from Pico or Mesa. http://pico-systems.com/osc2.5/catalog/product_info.php?cPath=3products_id=26 Mesa 7i29 (note that it handles 2 motors per card): http://www.mesanet.com/motioncardinfo.html Neither the Pico or the Mesa card are analogue-input. They both actually want a PWM signal, and both Pico and Mesa have hardware to produce that. The 7i29 is a different family to the 5i25, being 50-pin header rather than DB25. This is mainly a wiring issue, as I understand it, and I think that adapters exist. However unless you are committed to the 5i25 the 5i20 would be simpler. I _think_ that the analogue outputs on the 7i77 are generated by a DAC, so whilst PWM control of Pico amps with a Mesa 5i25 is almost certainly entirely possible, It isn't just a wiring issue, you would need a PWM firmware. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
On 5 September 2013 10:36, Bob Weiss bweiss0...@gmail.com wrote: It would be nice though if there was such a Parallel Port Breakout type board pre-made for those that need that option and provided the connectors ready to be wired up.. I made one for the Raspberry Pi: https://picasaweb.google.com/108164504656404380542/CNCUnsorted#5889107885914527378 It cost me $20 for 20 of the PCBs. There is a magic chip that does bidirectional level shifting, so the breakout doesn't need to know which pins are inputs and which are outputs. http://docs-europe.electrocomponents.com/webdocs/0b4c/0900766b80b4c8d8.pdf -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Thu, 9/5/13, andy pugh bodge...@gmail.com wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Date: Thursday, September 5, 2013, 3:19 AM On 5 September 2013 05:40, Gregg Eshelman g_ala...@yahoo.com wrote: The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM 2400. Max voltage 140 DC 140V * 30A = 4200W 140V * 5.8A = 800W 3Nm * 2400 rpm = 750W You probably want at least 750W motors, geared to suit any difference in nominal motor speed. My small knee mill seems pretty reasonable with 750W brushless servos. Though I suspect that I am limited by software commutation at that top speed end. --- The Servo Dynamics SDF1525-12 is rated at 120 volts so I assume the motors never saw 140 volts. Still nearly 700 Watts. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Spindle Lubrication
On 04.09.13 15:21, andy pugh wrote: On 4 September 2013 14:05, Stuart Stevenson stus...@gmail.com wrote: Oil bath bearings in the bottom of a gearbox are bathed in ALL of the wear particles of the gear train - not a good situation. That's an interesting point. I guess it is possible that the idea is that the gearbox oil washes the bearings Then it ought to be beneficial to fit a strong magnet on the end of any drain plug in the head, or drill and tap a hole to allow for one, if absent. The bearing would provide ample oil agitation for the magnet to filter the oil, I figure Erik -- In our civilization, and under our republican form of government, intelligence is so highly honored that it is rewarded by exemption from the cares of office. - Ambrose Bierce, The Devil's Dictionary (We go to the polls on Saturday, and that seems to apply here too.) -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
2013/9/5 Gregg Eshelman g_ala...@yahoo.com On Thu, 9/5/13, andy pugh bodge...@gmail.com wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Date: Thursday, September 5, 2013, 3:19 AM On 5 September 2013 05:40, Gregg Eshelman g_ala...@yahoo.com wrote: The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM 2400. Max voltage 140 DC 140V * 30A = 4200W 140V * 5.8A = 800W 3Nm * 2400 rpm = 750W You probably want at least 750W motors, geared to suit any difference in nominal motor speed. My small knee mill seems pretty reasonable with 750W brushless servos. Though I suspect that I am limited by software commutation at that top speed end. --- The Servo Dynamics SDF1525-12 is rated at 120 volts so I assume the motors never saw 140 volts. Still nearly 700 Watts. I don't know what your machine looks like, but I think many people believe they need much larger servos than actually needed. My steel router has a gantry weight around 80-90 kg and is driven by small Nidec servos rated at 80 V (really small). I can assure you that my computer is the bottleneck and if I go from max feed to a complete stop the whole table shakes. It's all about acceleration, and I can accelerate pretty fast. If I don't remember wrong I lowered the max_accel value to 2250 from 3000 to be able to cut with the table jumping around. This machine has a belt reduction and 5 mm pitch so I have no problem running alu or steel despite the small motors, it's the spindle that doesn't take it. /S -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Creating Screw Compensation Table
I've RTFM and Googled but I can't find an idiot's guide to creating a lead screw compensation table for Linuxcnc. Is my googlefu weak or is there no such thing? ...or do I actually need one at all? As background (Hello! and Warning Newbie Alert!) I have a metric WMD30LV (big brother to the G0704) mill using the standard lead screws being driven by 7Nm NEMA 34 steppers (oldham couplers), DQ860MA drivers and a cheapy BOB connected to a parallel port with Linuxcnc 2.5.3 in control. The mill has glass scale DRO's on all axis (fitted when I thought I could resist going CNC... Pah! :-) However, I think I might have a problem with the accuracy of my lead screws or perception of accuracy and/or something else... which is why I'm thinking that a lead screw compensation file might be better than a crude backlash setting (yes I have backlash and no, I'm not surprised but I'd like to make chips before embarking on a ballscrew conversion). If I do: G90 G0 X0 X50 reset DRO to zero in the X axis X100 and take a reading from my DRO I get slightly under 50mm shown. I've tried various microsteppings with the following results on X Y: Micro Steps X-Axis Y-Axis 40049.960 49.950 80049.960 49.930 100049.970 49.970 200049.965 49.970 400049.955 49.970 Max variation: 0.015mm (0.59 thou) in X and 0.04mm (1.57 thou) in Y. Does that look like lost steps? or as much accuracy as I'm likely to see? (one can get hung up on accuracy reading the various cnc lists'n'forums and watching the DRO for that +-5 flicker in the third decimal place :-) Is this the sort of thing that a screw compensation table is meant to deal with? If so, how do I actually measure the numbers for the table? Are the measurements absolute or relative to the previous move? How do I get the reverse or reverse trim numbers? Sorry for being a thickie. If I do use a compensation table, ISTR that there's a limit of 256 entries and the table on my mill moves +-300mm. Is a table entry for every 2.34mm what I need to generate? Thanks in advance. PS - If I do need a compensation table and work out how to generate one I'll put something on the wiki for future newbies. -- Regards, Russell | Russell Brown | MAIL: russ...@lls.com PHONE: 01780 471800 | | Lady Lodge Systems | WWW Work: http://www.lls.com | | Peterborough, England | WWW Play: http://www.ruffle.me.uk | -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
On 09/05/2013 02:31 AM, Mark Wendt wrote: On Wed, Sep 4, 2013 at 2:15 PM, Kirk Wallace kwall...@wallacecompany.comwrote: On 09/04/2013 09:56 AM, Kirk Wallace wrote: ... snip I tried AXIS but got: http://www.wallacecompany.com/machine_shop/LinuxCNC/Screenshot-3.png so I guess AXIS doesn't work with the BBB. Now, on to integrating real hardware. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ Kirk, That's not a LinuxCNC/Axis error, that's an X error. There should be something in the X logs that point to the problem. Look in your home directory for the .xsession-errors file. Should say in there what parameter caused the X window to barf. Mark ... snip I have some HDMI and USB bits on order, so I can hook up a monitor, keyboard, and mouse directly. The X problem will be put lower on on my list. It would be really nice to collect the nuggets of X wisdom as applied to LInuxCNC on the wiki somewhere. I have used xorg.conf to force X to give me what I need, but I'm sure there are much better ways to do this. On the other hand, rant on the best practices will probably change as soon as we get something that works. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
Gregg Eshelman wrote: What I'm looking for is for each type of motor (AC and BLDC) is You want at least x watts and n amps to at least be in the same range as the old motor. On cncdrives.com I noticed the torque values listed are different for AC and DC motors of the same watts. The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM 2400. Max voltage 140 DC. Now, there's an important data point missing from your original question! RPM. So, a motor of so many Watts can be wound for low-speed or high-speed operation. Belt drives have a limited ratio they can provide in one stage. So, a 3:1 or 4:1 reduction is the maximum that is practical in this case. Also, as the belt reduction increases, the motor's OWN inertia becomes dominant. That's why many machine tools run the motors 1:1 with massively oversized motors to get the required torque for acceleration. But, modern motors, especially the brushless type, have low enough rotational inertia that a 2:1 ratio will be just fine. Anyway, you can compute the linear force a ballscrew can exert from some given motor torque, and then compute how much acceleration in G's that will give. That is a good exercise, rather than talking about motor Watts. Jon -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Creating Screw Compensation Table
On 5 September 2013 19:08, Russell Brown russ...@lls.lls.com wrote: Were the 'errors' I showed (~.015mm over a 50mm move) in the right ball park for a non-ball-screw benchtop mill driven by steppers? Not brilliant, but then I doubt that the machine is driven by super-precision screws. Should I expect a commanded 50mm move to travel 0.040mm less than 50mm ? Does the variation in actual distance moved indicate missed steps? (the actual move varied with different microsteppings) You may be missing steps, it is always a possibility with stepper machines. I don't suppose you have any way to get the DRO feedback into the PC? Closing the loop might be a fun project. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Creating Screw Compensation Table
Quoth bodge...@gmail.com. On 5 September 2013 16:33, Russell Brown russ...@lls.lls.com wrote: Is this the sort of thing that a screw compensation table is meant to deal with? If so, how do I actually measure the numbers for the table? Then just run up the table, G0 X10, note the reading and make a comp file entry of 10,9.92, and so on to the end of travel, then come back the other way, filling in the third column. OK. If I do that, given my X backlash of 0.165mm and an assumed feed of 9.92mm for every 10mm commanded, then I end up with a table like: 00.00 00.00 0.165 (10.085-9.92) 10.00 09.92 10.085 (20.005-9.92) 20.00 19.84 20.005 (29.76-9.92+my_backlash) 30.00 29.76 Does that look right? Given 600mm travel on the X-axis, what table intervals make sense? Or have I misunderstood the question? Well. You missed bits... but it was multi-part :-) Were the 'errors' I showed (~.015mm over a 50mm move) in the right ball park for a non-ball-screw benchtop mill driven by steppers? Should I expect a commanded 50mm move to travel 0.040mm less than 50mm ? Does the variation in actual distance moved indicate missed steps? (the actual move varied with different microsteppings) Am I trying to fix something that's 'normal' ? -- Regards, Russell | Russell Brown | MAIL: russ...@lls.com PHONE: 01780 471800 | | Lady Lodge Systems | WWW Work: http://www.lls.com | | Peterborough, England | WWW Play: http://www.ruffle.me.uk | -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Control refit options - best economical servo amp for this application?
On 09/05/2013 02:53 AM, andy pugh wrote: On 5 September 2013 08:11, Greg Bentzinger skullwo...@yahoo.com wrote: What he would like to do is replace the amps and control, re-using servos and existing limit switch wiring and power supplies. ... I will likely use one of the 5i25 combo's for I/O. I am considering showing him touchy but I have not used it myself as yet so it will be alot more extra homework for me. For DC servos I would either be looking at second-hand AMC drives from eBay/ New I would be looking at Granite Devices, or the properly dumb drives from Pico or Mesa. ... snip The Pico/Mesa amps have my vote. You can leverage the intelligence built into LinuxCNC, instead of trying to arbitrate between LinuxCNC and the intelligence in the drives. LinuxCNC should have no trouble utilizing tachometer, rotary encoder, or scale input, and you get to use HALscope for tuning. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Creating Screw Compensation Table
On 5 September 2013 16:33, Russell Brown russ...@lls.lls.com wrote: Is this the sort of thing that a screw compensation table is meant to deal with? If so, how do I actually measure the numbers for the table? Normally it is quite difficult. But as you have glass scales then it seems like it ought to be very simple in your case. http://www.linuxcnc.org/docs/html/config/ini_config.html#_axis_lt_num_gt_section_a_id_sub_axis_section_a You need to specify a COMP_FILE and COMP_FILE_TYPE in the INI file. You can choose to specify an absolute or relative file (that's the FILE_TYPE) I think what you need to do in your case is switch to machine coordinate view (#, or use the menu if you don't have a #, or Linux hasn't found it) Then G0 X0 and manually push the axis to the end of backlash (unless your config allows you to approach zero from the other side). First line in the comp file is now 0,0,? Then just run up the table, G0 X10, note the reading and make a comp file entry of 10,9.92, and so on to the end of travel, then come back the other way, filling in the third column. Or have I misunderstood the question? -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
I still don't see a benefit in using a BB with a Bridgeport class machine I tend to assume that a single-board computer like the Beaglebone would be more reliable than a desktop PC, just because it has fewer moving parts. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
Anyway, you can compute the linear force a ballscrew can exert from some given motor torque, and then compute how much acceleration in G's that will give. That is a good exercise, rather than talking about motor Watts. Jon ...which you can do with my calc sheet posted earlier. :) /S -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Control refit options - best economical servo amp for this application?
Greg Bentzinger wrote: Hello group; An old friend contacted me recently about problems he has been having with his hobby mill. I say hobby because the man is a top notch surgeon who does mainly reconstruction of destroyed hands. His hobby mill looks to be a late 70's vintage CNC knee mill with a 2 or 3 hp Universal 300 qwik switch spindle. The control CRT is long gone and a BW 7 inch hand held TV is strapped in place using composite RCA video. I'm guessing a Z80A cpu. The Mill has Baldor servos as follows; ModelM-4060-FL-43 Mfg Code 16/190 81633 Max Current25A Torque Stall350 oz inch Max Speed2500 RPM Max Volt120 VDC There are a couple of Pico Systems (disclaimer: my company) ways to go with this. We have an analog servo system called the PPMC (Parallel Port Motion Control) that can use analog velocity servo amps such as the Copley or AMC. Copley DOES make higher current servo amps, such as the 422. (180 V, 20 A peak). The other way is our PWM servo amps and PWM controller. This is also capable of 120+ V at 20 A peak. You can look these up at http://pico-systems.com Jon -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Creating Screw Compensation Table
What are the DRO readings vs. commanded position at regular intervals along the entire length of travel? On Thu, Sep 5, 2013 at 1:20 PM, andy pugh bodge...@gmail.com wrote: On 5 September 2013 19:08, Russell Brown russ...@lls.lls.com wrote: Were the 'errors' I showed (~.015mm over a 50mm move) in the right ball park for a non-ball-screw benchtop mill driven by steppers? Not brilliant, but then I doubt that the machine is driven by super-precision screws. Should I expect a commanded 50mm move to travel 0.040mm less than 50mm ? Does the variation in actual distance moved indicate missed steps? (the actual move varied with different microsteppings) You may be missing steps, it is always a possibility with stepper machines. I don't suppose you have any way to get the DRO feedback into the PC? Closing the loop might be a fun project. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On 9/5/13 7:07 AM, Gregg Eshelman wrote: On Thu, 9/5/13, andy pugh bodge...@gmail.com wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Date: Thursday, September 5, 2013, 3:19 AM On 5 September 2013 05:40, Gregg Eshelman g_ala...@yahoo.com wrote: The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM 2400. Max voltage 140 DC 140V * 30A = 4200W 140V * 5.8A = 800W 3Nm * 2400 rpm = 750W You probably want at least 750W motors, geared to suit any difference in nominal motor speed. My small knee mill seems pretty reasonable with 750W brushless servos. Though I suspect that I am limited by software commutation at that top speed end. --- The Servo Dynamics SDF1525-12 is rated at 120 volts so I assume the motors never saw 140 volts. Still nearly 700 Watts. Divide watts by 746 to get hp. Under the heading you get what you pay for, have you looked at the Teknic Hudson series? http://www.teknic.com/products/motor_sel.php# They are available in a variety of stack lengths and windings, and sold in the US by Bearing Engineers: http://www.bearingengineers.com/products/product.php?id=223 Bearing Engineers have app specialists who would be happy to talk with you. No affiliation, just looking into these for one of my projects. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Creating Screw Compensation Table
If you do bidirectional compensation then backlash does not apply. I think I would adjust the scale to get the numbers to match as good as possible. Then the compensation values would be small. On Thu, Sep 5, 2013 at 1:20 PM, andy pugh bodge...@gmail.com wrote: On 5 September 2013 19:08, Russell Brown russ...@lls.lls.com wrote: Were the 'errors' I showed (~.015mm over a 50mm move) in the right ball park for a non-ball-screw benchtop mill driven by steppers? Not brilliant, but then I doubt that the machine is driven by super-precision screws. Should I expect a commanded 50mm move to travel 0.040mm less than 50mm ? Does the variation in actual distance moved indicate missed steps? (the actual move varied with different microsteppings) You may be missing steps, it is always a possibility with stepper machines. I don't suppose you have any way to get the DRO feedback into the PC? Closing the loop might be a fun project. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/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 -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Thu, 2013-09-05 at 20:19 -0400, Kerry Lynn wrote: On 9/5/13 7:07 AM, Gregg Eshelman wrote: On Thu, 9/5/13, andy pugh bodge...@gmail.com wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Date: Thursday, September 5, 2013, 3:19 AM On 5 September 2013 05:40, Gregg Eshelman g_ala...@yahoo.com wrote: The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM 2400. Max voltage 140 DC 140V * 30A = 4200W 140V * 5.8A = 800W 3Nm * 2400 rpm = 750W You probably want at least 750W motors, geared to suit any difference in nominal motor speed. My small knee mill seems pretty reasonable with 750W brushless servos. Though I suspect that I am limited by software commutation at that top speed end. --- The Servo Dynamics SDF1525-12 is rated at 120 volts so I assume the motors never saw 140 volts. Still nearly 700 Watts. Divide watts by 746 to get hp. Before you jump check to see if those amps weren't connected directly to the line. The set I have of SD board amps just like your's that runs directly off line voltage. It is a little hot but those motor are rather responsive at 167 VDC. ;-) Dave Under the heading you get what you pay for, have you looked at the Teknic Hudson series? http://www.teknic.com/products/motor_sel.php# They are available in a variety of stack lengths and windings, and sold in the US by Bearing Engineers: http://www.bearingengineers.com/products/product.php?id=223 Bearing Engineers have app specialists who would be happy to talk with you. No affiliation, just looking into these for one of my projects. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Thu, 9/5/13, Sven Wesley svenne.d...@gmail.com wrote: I don't know what your machine looks like, but I think many people believe they need much larger servos than actually needed. My steel router has a gantry weight around 80-90 kg and is driven by small Nidec servos rated at 80 V (really small). That's not even 200 pounds. The table on this mill is 10x50 - 25.4x127 centimeters, 4 - 10cm at its thickest, of cast iron, plus the saddle. That's a lot of weight to move, which I'm not in the least interested in removing unless or until it absolutely needs to be. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
Ron Bean wrote: I still don't see a benefit in using a BB with a Bridgeport class machine I tend to assume that a single-board computer like the Beaglebone would be more reliable than a desktop PC, just because it has fewer moving parts. All Bridgeport mill and Romi lathes made since 1980 (maybe earlier) had desktop PC motherboards in them. We have 3 at work like that. Jon -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Creating Screw Compensation Table
Were the 'errors' I showed (~.015mm over a 50mm move) in the right ball park for a non-ball-screw benchtop mill driven by steppers? This sounds well within then range if normal screws if not better than I would have expected. Another way of looking at this is it is 0.03% error. Very small. The trouble with non-ball-screws is wear from sliding as compared balls with rolling. The nuts and screws wear quickly and therefor the calibration goes out quite quickly. Cheers Wallace. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Plasma Table
Has anyone done a DIY plasma table, or have suggestions I could find out about a DIY version? I am a rookie and just learning, wanting to find out if it could be practical for a hobby setup. TIA, Jack -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
