Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
On 25 November 2014 at 02:10, Leonardo Marsaglia leonardomarsagli...@gmail.com wrote: Well, the lathe I'm going to try this on is the Mazak. It has the spindle sensor coupled with a timing pulley so there are no gears. What is wrong with the existing spindle sensor? -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
2014-11-25 0:40 GMT-03:00 Gene Heskett ghesk...@wdtv.com: 360, a pulse every degree? if you can only track it to 20 kilohertz, your circuit is in trouble by about 58 rpm. I am using a 50 cycle/turn encoder, and the 5i25 is still loafing at 1500 revs. But I would think it would have to work a little harder watching a 360 cycle ABX. As far as usefulness for threading, the 50 cycle seems at least adequate. I have used every thread I have cut with it except the one I saw being started well at about 150 rpm, then shoved the slider over to about 700. Instant mess. Hello Gene. I didn't express correctly about that. The 20 Khz is the pulse generation cabability of these encoders. I'm going to use hardware encoder counters so I'm far above 20 Khz for reading the pulses. For the job that I'm planning to do with the lathe wich is rough cutting of camshafts I'm not going to exceed 40 RPM on the spindle because the maximum speed of the X axis is 1 mm/min. It would be ideal to use a round mill and cutter compensation for this job to increase cutting speed and I'm sure LinuxCNC can handle this more than well, but for this first test I'm comfortable with the low speed since this is a big improvement in machining the lobes. Also, for that case we have two old slant copying lathes that are great candidates for such a modification, in fact they are waiting for a LinuxCNC retrofitting. ANyway for normal turning I'm close to 1200 RPM sometimes, but that's not going to be a problem for these encoders, nor the hardware for reading them. -- *Leonardo Marsaglia*. -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
2014-11-25 7:28 GMT-03:00 andy pugh bodge...@gmail.com: What is wrong with the existing spindle sensor? Andy, just before answering you I removed the sheet that covers the acces to the sensor, and found out that it's a rotary encoder. The brand is Nikon and the model number is RFh - 1024 - 22 - 1M, so I guess is a 1024 PPR encoder. Also it has to have an index pulse for threading. I was just guessing before that I would have to replace it because I thought that the sensor might be a tachometer with and index pulse or something like that. I wasn't sure because the manuals don't say a thing about it but now I know what I have there :) Anyway the main reason of why I need 360 PPR is because as you know in the automotive camshatfts lobe positions between cylinders vary by 90° degrees, and between inlet and outlet there are more or less105°, in any case the variation usually occurs on a scale of 1° degree. So my idea was for rough cutting to have a resolution of 1° to ensure I can machine all the camshafts. Having a 1024 PPR encoder is not that bad, I guess I can scale it using HAL (is that right?) and that would give a pretty accurate variation for cutting the lobes. I'm aware that a few relevant points around the lobe will do the trick for making the profile accurate enough, the main concern for me is that I need to offset the angular position as I change from one lobe to the next one. -- *Leonardo Marsaglia*. -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Simple inverters!! (Half bridges)
Control signals are the same regardless of current and voltage rating so the same chip for example a MCU or FPGA could be used for signal generation regardless of size which is the reason why I want them as separate modules with or without the control logic. The second reason is inverter bridge stay the same for different type of electric motors although control logic may have to be changed for example by using different software. As is now I find totally integrated drivers without possility to change software. With this approach there is one power factor corrector and possible voltage transformation in each driver which make them relatively expensive. Components for an inverter running from for example a 48 volt DC power rail is cheap. Although not optimal it will also work from a lower voltage. One large power converter instead of several small will also be cheaper. There are also several several or more cheap micro controllers available with special purpose built hardware for motor control to generate the control signals, some software libraries are also available. Nicklas Karlsson On Mon, 24 Nov 2014 09:36:58 -0500 John Kasunich jmkasun...@fastmail.fm wrote: You don't mention voltage or current ratings. They are pretty relevant. The bigger you go the more demanding the power circuit design becomes, and the less likely you are to find pre-built all-in-one solutions. On Mon, Nov 24, 2014, at 05:46 AM, Karlsson Wang wrote: I have not been able to find simple inverters or half bridges which is the basic building block of an electric motor driver regardless of type or size. Do anybody know about?? Currently I am developing these half bridges myself. It works great but it is time consuming and the result is not the best. Then half bridges with logic input signals are available there are cheap development boards available from several suppliers so this is really a missing key part not readily available. Nicklas Karlsson -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- John Kasunich jmkasun...@fastmail.fm -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Simple inverters!! (Half bridges)
Most of this discussion is past my knowledge level but this may be easy to build ( not a module but few parts ) and 250w to 2kw and fairly high voltage HTH http://www.irf.com/technical-info/appnotes/an-1044.pdf regards TomP tjtr33 On 11/25/2014 10:15 AM, Karlsson Wang wrote: Control signals are the same regardless of current and voltage rating so the same chip for example a MCU or FPGA could be used for signal generation regardless of size which is the reason why I want them as separate modules with or without the control logic. The second reason is inverter bridge stay the same for different type of electric motors although control logic may have to be changed for example by using different software. As is now I find totally integrated drivers without possility to change software. With this approach there is one power factor corrector and possible voltage transformation in each driver which make them relatively expensive. Components for an inverter running from for example a 48 volt DC power rail is cheap. Although not optimal it will also work from a lower voltage. One large power converter instead of several small will also be cheaper. There are also several several or more cheap micro controllers available with special purpose built hardware for motor control to generate the control signals, some software libraries are also available. Nicklas Karlsson On Mon, 24 Nov 2014 09:36:58 -0500 John Kasunich jmkasun...@fastmail.fm wrote: You don't mention voltage or current ratings. They are pretty relevant. The bigger you go the more demanding the power circuit design becomes, and the less likely you are to find pre-built all-in-one solutions. On Mon, Nov 24, 2014, at 05:46 AM, Karlsson Wang wrote: I have not been able to find simple inverters or half bridges which is the basic building block of an electric motor driver regardless of type or size. Do anybody know about?? Currently I am developing these half bridges myself. It works great but it is time consuming and the result is not the best. Then half bridges with logic input signals are available there are cheap development boards available from several suppliers so this is really a missing key part not readily available. Nicklas Karlsson -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- John Kasunich jmkasun...@fastmail.fm -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
On 25 November 2014 at 16:11, Leonardo Marsaglia leonardomarsagli...@gmail.com wrote: Having a 1024 PPR encoder is not that bad, I guess I can scale it using HAL (is that right?) and that would give a pretty accurate variation for cutting the lobes. Yes, if you set the encoder scale to 2.844 (1024/360) the encoder will read out directly in degrees. (it might need to be 4x higher if the 1024 is slots not edges) It isn't 100% ideal as there is scope for rounding errors after many thousands of turns, as 1024/360 doesn't quite go. If you put in a large number of decimal places it will take a long time to be wrong, though. Double-precison is good to about 15 significant figures, so you might expect to see the angle drifting after a few trillion revolutions, which probably doesn't matter. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
On Tuesday 25 November 2014 09:49:28 Leonardo Marsaglia did opine And Gene did reply: 2014-11-25 0:40 GMT-03:00 Gene Heskett ghesk...@wdtv.com: 360, a pulse every degree? if you can only track it to 20 kilohertz, your circuit is in trouble by about 58 rpm. I am using a 50 cycle/turn encoder, and the 5i25 is still loafing at 1500 revs. But I would think it would have to work a little harder watching a 360 cycle ABX. As far as usefulness for threading, the 50 cycle seems at least adequate. I have used every thread I have cut with it except the one I saw being started well at about 150 rpm, then shoved the slider over to about 700. Instant mess. Hello Gene. I didn't express correctly about that. The 20 Khz is the pulse generation cabability of these encoders. I wondered about that, after I had clicked Send. :) I'm going to use hardware encoder counters so I'm far above 20 Khz for reading the pulses. For the job that I'm planning to do with the lathe wich is rough cutting of camshafts I'm not going to exceed 40 RPM on the spindle because the maximum speed of the X axis is 1 mm/min. That is about 2x what mine can do. I think, not actually measured because it only has a hair over 2.5 of travel. It would be ideal to use a round mill and cutter compensation for this job to increase cutting speed and I'm sure LinuxCNC can handle this more than well, but for this first test I'm comfortable with the low speed since this is a big improvement in machining the lobes. Also, for that case we have two old slant copying lathes that are great candidates for such a modification, in fact they are waiting for a LinuxCNC retrofitting. I am sure we've both seen some pretty square camshafts but everytime I think about the roller tappet stuff, I recall the cam and tappets in the Nash Ambassador big 6 engine used from '49 to the end of Nash. That engine was a stroker, at 4 3/8, but it had, from a hot rod viewpoint, every trick in the book, much of which was unlocked if you put the timing gears back in so the cam was a tooth late. Between that and some work on the distributor, there was another 100 horses in there you could take to the starting gate. One of its secrets was the cam follower tappets, huge mushroom faces that just cleared the next one over, fully 2 or a hair more in diameter, with a spherical face radii of about 4 feet. That gave them room for a cam diameter out of sight for most engines, and while the timing was only about 255 degrees, the lift, and squareness of the lift was at least as good as you could get with roller tappets. Combined with tulip'd valves and double springs, and despite the single barreled carb and that covered ditch in the head casting capable of being uncovered and suitably polished, could breath better than anything else on the road at the time, and got phenomenal gas mileage, 20+ at 100 mph doing it. Biggest problem was the puny brakes, nowhere big enough to do a panic stop but once, then you had to replace all the drums, they got that hot warped out of round, about a quarter inch. 9 drums, 1.5 wide in front, 1.25 wide in back IIRC. A joke. But that joke could hang the speedo needle straight down if you wanted it to. ANyway for normal turning I'm close to 1200 RPM sometimes, but that's not going to be a problem for these encoders, nor the hardware for reading them. The way that 1hp is geared, 1200 is marching right along for my toy. Cheers, Gene Heskett -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Simple inverters!! (Half bridges)
Yes it is except EMC problems. This module have three half bridges. I used two half bridges and four dicrete transistors instead. It works but would be simpler to just buy this building block if available. With direct access to the switches I will be able to implement better control algorithm later on, change type of motor and not be stuck with builtin voltage since I use external power supply. Six half bridges may be used for two three phase motors or three DC motors. Nicklas Karlsson On Tue, 25 Nov 2014 10:47:14 -0600 TJoseph Powderly tjt...@gmail.com wrote: Most of this discussion is past my knowledge level but this may be easy to build ( not a module but few parts ) and 250w to 2kw and fairly high voltage HTH http://www.irf.com/technical-info/appnotes/an-1044.pdf regards TomP tjtr33 On 11/25/2014 10:15 AM, Karlsson Wang wrote: Control signals are the same regardless of current and voltage rating so the same chip for example a MCU or FPGA could be used for signal generation regardless of size which is the reason why I want them as separate modules with or without the control logic. The second reason is inverter bridge stay the same for different type of electric motors although control logic may have to be changed for example by using different software. As is now I find totally integrated drivers without possility to change software. With this approach there is one power factor corrector and possible voltage transformation in each driver which make them relatively expensive. Components for an inverter running from for example a 48 volt DC power rail is cheap. Although not optimal it will also work from a lower voltage. One large power converter instead of several small will also be cheaper. There are also several several or more cheap micro controllers available with special purpose built hardware for motor control to generate the control signals, some software libraries are also available. Nicklas Karlsson On Mon, 24 Nov 2014 09:36:58 -0500 John Kasunich jmkasun...@fastmail.fm wrote: You don't mention voltage or current ratings. They are pretty relevant. The bigger you go the more demanding the power circuit design becomes, and the less likely you are to find pre-built all-in-one solutions. On Mon, Nov 24, 2014, at 05:46 AM, Karlsson Wang wrote: I have not been able to find simple inverters or half bridges which is the basic building block of an electric motor driver regardless of type or size. Do anybody know about?? Currently I am developing these half bridges myself. It works great but it is time consuming and the result is not the best. Then half bridges with logic input signals are available there are cheap development boards available from several suppliers so this is really a missing key part not readily available. Nicklas Karlsson -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- John Kasunich jmkasun...@fastmail.fm -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT
[Emc-users] ac servomotor drive
hi i am interesting in motor drive for nema 34 ac servomotor motor has --torque 23 lb in, 4000 rpm. 6 Amp Sinusoidal http://www.google.com/url?sa=trct=jq=esrc=ssource=webcd=1ved=0CB4QFjAAurl=http%3A%2F%2Fwww.merriam-webster.com%2Fdictionary%2Fsinusoidalei=beV0VI6gGKP3igL86IDQDwusg=AFQjCNH6ILpv49YNmav_POqjnexAjNdpbgsig2=LqqAtkoKGvPwUlKSrboMiwbvm=bv.80185997,d.cGEcad=rja type simple -- no prammable. drive with + - 10 v dc anything that can do the task. thank you aram -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ac servomotor drive
On 25 November 2014 at 20:30, a k pccncmach...@gmail.com wrote: motor has --torque 23 lb in, 4000 rpm. 6 Amp Voltage? -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] VFD trouble
Hello! I need to drive 2 high-speed spindle motors, 3,7 kW each. For that I have 11 kW VFD. The problem is that I attached motors to the drive, tried to run them, but VFD does not increase frequency above 8-9 hertz (all the default frequency values are 50 hertz, I checked them and set to 100 to make sure that it not a problem). And in addition to that motors get really hot in a minute or so. I set no load current to 0,2 A, max current currently is set to 17 A (max current for each motor is 8,7A). This VFD worked fine few weeks ago with 7 kW motor. I checked the motors today with 2kW VFD - worked just fine. Ok, I can decrease max current to 2-3 amps, while testing, probably that should fix the overheating, but why does it not allow to increase frequency? I would appreciate also any additional advices on how to run 2 motors with 1 VFD. Viesturs -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] VFD trouble
Hi Viesturs! If your VFD has a vector control, maybe you should switch it over to V/F control with constant torque. I had the same trouble with my Hyundai VFD. Regards,Andrew ... 23:43 +0300 от Viesturs Lācis viesturs.la...@gmail.com: Hello! I need to drive 2 high-speed spindle motors, 3,7 kW each. For that I have 11 kW VFD. The problem is that I attached motors to the drive, tried to run them, but VFD does not increase frequency above 8-9 hertz (all the default frequency values are 50 hertz, I checked them and set to 100 to make sure that it not a problem). And in addition to that motors get really hot in a minute or so. I set no load current to 0,2 A, max current currently is set to 17 A (max current for each motor is 8,7A). This VFD worked fine few weeks ago with 7 kW motor. I checked the motors today with 2kW VFD - worked just fine. Ok, I can decrease max current to 2-3 amps, while testing, probably that should fix the overheating, but why does it not allow to increase frequency? I would appreciate also any additional advices on how to run 2 motors with 1 VFD. Viesturs -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ac servomotor drive
any between 120-220 V AC On Tue, Nov 25, 2014 at 12:39 PM, andy pugh bodge...@gmail.com wrote: On 25 November 2014 at 20:30, a k pccncmach...@gmail.com wrote: motor has --torque 23 lb in, 4000 rpm. 6 Amp Voltage? -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] VFD trouble
Thank you! Yes, there is such a setting. Could you, please, explain in more detail, if there are any addditional settings I should pay attention to, when switching over to vector control? Or should I just start with this one change and check for any improvements? Viesturs 2014-11-25 23:00 GMT+02:00 Andrew stormbringe...@mail.ru: Hi Viesturs! If your VFD has a vector control, maybe you should switch it over to V/F control with constant torque. I had the same trouble with my Hyundai VFD. Regards,Andrew ... 23:43 +0300 от Viesturs Lācis viesturs.la...@gmail.com: Hello! I need to drive 2 high-speed spindle motors, 3,7 kW each. For that I have 11 kW VFD. The problem is that I attached motors to the drive, tried to run them, but VFD does not increase frequency above 8-9 hertz (all the default frequency values are 50 hertz, I checked them and set to 100 to make sure that it not a problem). And in addition to that motors get really hot in a minute or so. I set no load current to 0,2 A, max current currently is set to 17 A (max current for each motor is 8,7A). This VFD worked fine few weeks ago with 7 kW motor. I checked the motors today with 2kW VFD - worked just fine. Ok, I can decrease max current to 2-3 amps, while testing, probably that should fix the overheating, but why does it not allow to increase frequency? I would appreciate also any additional advices on how to run 2 motors with 1 VFD. Viesturs -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
On 11/25/2014 11:46 AM, andy pugh wrote: On 25 November 2014 at 16:11, Leonardo Marsaglia leonardomarsagli...@gmail.com wrote: Having a 1024 PPR encoder is not that bad, I guess I can scale it using HAL (is that right?) and that would give a pretty accurate variation for cutting the lobes. Yes, if you set the encoder scale to 2.844 (1024/360) the encoder will read out directly in degrees. (it might need to be 4x higher if the 1024 is slots not edges) It isn't 100% ideal as there is scope for rounding errors after many thousands of turns, as 1024/360 doesn't quite go. If you put in a large number of decimal places it will take a long time to be wrong, though. Double-precison is good to about 15 significant figures, so you might expect to see the angle drifting after a few trillion revolutions, which probably doesn't matter. Since you have limited availability of local parts; you might want to consider using some automotive sensors such as the camshaft and crankshaft sensors used by most cars these days. I've replaced some on Fords over the years and they typically fit into a hole recess in the engine block and extend to sense a gear or segmented ring. Around here (Midwest USA) I have seen them as cheap as $15 or so. I believe the sensors I was checking/replacing were run off 5 volt power, so they should not be difficult to interface. Apparently the Ford sensors I was testing were hall effect sensors. More cam and crank sensor info that you probably need. http://www.aa1car.com/library/crank_sensors.htm http://easyautodiagnostics.com/misc-index/ckp-cmp-sensor-basics-1 If you stagger two hall effect sensors on a gear so they are out of phase by 90 degrees, you can create a full quadrature signal fairly easily. If you have a timing belt pulley, that may work as well. Dave --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] VFD trouble
Just change it to volts/hz. I'd set it up like it is one big motor. Add the full load amps together, etc like you mentioned. It should work with a volts/hz setting. Some drives are just too smart. :-) Dave On 11/25/2014 4:09 PM, Viesturs Lācis wrote: Thank you! Yes, there is such a setting. Could you, please, explain in more detail, if there are any addditional settings I should pay attention to, when switching over to vector control? Or should I just start with this one change and check for any improvements? Viesturs 2014-11-25 23:00 GMT+02:00 Andrew stormbringe...@mail.ru: Hi Viesturs! If your VFD has a vector control, maybe you should switch it over to V/F control with constant torque. I had the same trouble with my Hyundai VFD. Regards,Andrew ... 23:43 +0300 от Viesturs Lācis viesturs.la...@gmail.com: Hello! I need to drive 2 high-speed spindle motors, 3,7 kW each. For that I have 11 kW VFD. The problem is that I attached motors to the drive, tried to run them, but VFD does not increase frequency above 8-9 hertz (all the default frequency values are 50 hertz, I checked them and set to 100 to make sure that it not a problem). And in addition to that motors get really hot in a minute or so. I set no load current to 0,2 A, max current currently is set to 17 A (max current for each motor is 8,7A). This VFD worked fine few weeks ago with 7 kW motor. I checked the motors today with 2kW VFD - worked just fine. Ok, I can decrease max current to 2-3 amps, while testing, probably that should fix the overheating, but why does it not allow to increase frequency? I would appreciate also any additional advices on how to run 2 motors with 1 VFD. Viesturs -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] LCNC VS Machinekit JWP
Last week I started a post about larger machines and parts and working around jog while paused being missing in LCNC and I had enough posts showing me that Machinekit does indeed have the jog while paused. So we went over there to check it out yes they have it and we played with it on the sim and thought maybe we would make the switch. We have come to find out that Machine kit does not (readily) support the 7i80 Ethernet set-up we are running. Really had no desire to make the switch but it would have been worth it to have a jog while paused option. Looks like we will be staying on LCNC and trying to play with any options that come our way using LCNC and gmoccapy. Just updating the followers of the jog while paused saga..LOL All of this may be easier if we understood the working of the code both Linux and LCNC we are learning but it is a steep curve. Jeff Johnson john...@superiorroll.com Superior Roll Turning 734-279-1831 -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] VFD trouble
You do NOT want to switch to vector control. Andew was suggesting that you switch FROM vector TO V/Hz control. I agree with him. If you are going to run two motors on one VFD you must use straight V/Hz control. True vector control needs encoder feedback from the motor so that it can control the magnetic field vectors inside the motor. If you have two motors on the same drive, the drive can't possibly know what is going on inside each motor. One might be spinning fine and the other might be stalled, etc. Vector control can offer very good performance, but it MUST know the motor speed to do that. With two motors it will be confused. Many drives offer sensorless vector that doesn't need an encoder. The exact meaning of sensorless vector varies from manufacturer to manufacturer. Those words are defined by the marketing department, there is no real standard definition of a sensorless vector control algorithm. But most sensorless drives still assume that there is only a single motor on the other end of the wires, and will try to figure out what that motor is doing in order to control it. Again, two motors will likely confuse the drive. Straight V/Hz control simply makes AC power of a specified frequency, and lets the motor do what it will. It isn't much different from running the motor directly from the line, except that you can change the frequency. Because V/Hz is very similar to running the motor straight from the line, you can run more than one motor. However, there are still some things to watch out for. When you are running a single motor from a VFD, you tell the VFD the rated current of the motor. If the load on the motor increases and it starts to draw too much current, the VFD will shut things down before the motor overheats. Suppose you have two motors, each rated at 7A. You connect them to a single VFD and tell the VFD that the rating is 14A. Now suppose the load on one spindle is very light, but the other one is taking a heavy cut. So heavy that the motor is overloaded, drawing 11 amps. But the other one is only drawing 2A, the total is 13A, and the VFD is perfectly happy. Until the smoke comes out of the overloaded motor. In industry, if you run two motors from one VFD, you MUST supply individual overload protection for each motor - typically an overload relay as used with conventional motor starters. The relay contacts are used as interlocks to shut things down if either motor exceeds its rated current. By the way, the motor gets hot but doesn't develop much torque or speed problem you described is something that can happen even with a single motor on a vector VFD if the motor data isn't accurately entered into the drive. A V/Hz drive (or straight line voltage) is simple and forgiving - you apply voltage to the motor and it draws whatever current it needs. Vector is much more complex - the drive adjusts the voltage, current, and phase of the power it sends to the motor, trying to run the motor as precisely as possible. But it relies on knowing the motor characteristics to do that. It needs to accurately know the nominal voltage, no-load frequency, no-load current, full-load speed, and full-load current. Your no-load current of 0.2 amps seems way too low for an 8.7A motor, and in a vector drive would result in a lack of magnetic flux and a major loss of torque. To summarize: 1) for more than one motor on a single drive, use V/Hz, not vector. 2) for a single motor, if you want to use vector, you must enter all the motor nameplate data accurately into the drive. (Some drives have a self-tuning process or other start-up procedure to determine the no-load current, since that often is missing from the motor nameplate.) Hope this helps, John Kasunich On Tue, Nov 25, 2014, at 04:09 PM, Viesturs Lācis wrote: Thank you! Yes, there is such a setting. Could you, please, explain in more detail, if there are any addditional settings I should pay attention to, when switching over to vector control? Or should I just start with this one change and check for any improvements? Viesturs 2014-11-25 23:00 GMT+02:00 Andrew stormbringe...@mail.ru: Hi Viesturs! If your VFD has a vector control, maybe you should switch it over to V/F control with constant torque. I had the same trouble with my Hyundai VFD. Regards,Andrew ... 23:43 +0300 от Viesturs Lācis viesturs.la...@gmail.com: Hello! I need to drive 2 high-speed spindle motors, 3,7 kW each. For that I have 11 kW VFD. The problem is that I attached motors to the drive, tried to run them, but VFD does not increase frequency above 8-9 hertz (all the default frequency values are 50 hertz, I checked them and set to 100 to make sure that it not a problem). And in addition to that motors get really hot in a minute or so. I set no load current to 0,2 A, max current currently is set to 17 A (max current for each motor is 8,7A). This VFD worked fine few weeks
Re: [Emc-users] LCNC VS Machinekit JWP
On 11/25/14 2:30 PM, Jeff Johnson wrote: Last week I started a post about larger machines and parts and working around jog while paused being missing in LCNC and I had enough posts showing me that Machinekit does indeed have the jog while paused. So we went over there to check it out yes they have it and we played with it on the sim and thought maybe we would make the switch. We have come to find out that Machine kit does not (readily) support the 7i80 Ethernet set-up we are running. Really had no desire to make the switch but it would have been worth it to have a jog while paused option. Looks like we will be staying on LCNC and trying to play with any options that come our way using LCNC and gmoccapy. Just updating the followers of the jog while paused saga..LOL All of this may be easier if we understood the working of the code both Linux and LCNC we are learning but it is a steep curve. Dewey Garrett is working on a version of JWP for LinuxCNC. It's very different from what Machine kit is doing, and has different limitations. It's implemented as a HAL circuit, so it's minimally invasive, so i'm hoping to merge it for LinuxCNC 2.7. Here's the demo he posted this morning: https://www.youtube.com/watch?v=8QGOj39I-kk -- Sebastian Kuzminsky -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
On 25 November 2014 at 21:19, Dave Cole linuxcncro...@gmail.com wrote: I've replaced some on Fords over the years and they typically fit into a hole recess in the engine block and extend to sense a gear or segmented ring. Some sense a magnetised track on a code wheel. They use a missing-tooth indexing scheme, and the bidirectional ones used for stop-start applications indicate direction by pulse length. http://www.allegromicro.com/en/Products/Magnetic-Speed-Sensor-ICs/Crankshaft-Sensor-ICs.aspx -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] VFD trouble
2014-11-25 23:40 GMT+02:00 John Kasunich jmkasun...@fastmail.fm: To summarize: 1) for more than one motor on a single drive, use V/Hz, not vector. 2) for a single motor, if you want to use vector, you must enter all the motor nameplate data accurately into the drive. (Some drives have a self-tuning process or other start-up procedure to determine the no-load current, since that often is missing from the motor nameplate.) Hope this helps, Thank you very much, John, it did help to understand few things better. Yes, I have acquired overload relays to protect motors for the exact scenario you described, I just have not yet installed them as I am just trying to get the stuff working. Viesturs -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] LCNC VS Machinekit JWP
:Sebastian Kuzminsky Wrote Dewey Garrett is working on a version of JWP for LinuxCNC. It's very different from what Machine kit is doing, and has different limitations. It's implemented as a HAL circuit, so it's minimally invasive, so i'm hoping to merge it for LinuxCNC 2.7. Here's the demo he posted this morning: https://www.youtube.com/watch?v=8QGOj39I-kk We will be using it as long as it will work in Gmoccapy..Thanks Jeff Johnson john...@superiorroll.com Superior Roll Turning 734-279-1831 -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] LCNC VS Machinekit JWP
On 11/25/14 3:01 PM, Jeff Johnson wrote: :Sebastian Kuzminsky Wrote https://www.youtube.com/watch?v=8QGOj39I-kk We will be using it as long as it will work in Gmoccapy..Thanks It is totally GUI-agnostic, but it does require the machine integrator/builder to hook up some HAL wiring. Dewey is writing a sample config that shows how to use it. -- Sebastian Kuzminsky -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] LCNC VS Machinekit JWP
On Tuesday 25 November 2014 16:44:01 Sebastian Kuzminsky did opine And Gene did reply: On 11/25/14 2:30 PM, Jeff Johnson wrote: Last week I started a post about larger machines and parts and working around jog while paused being missing in LCNC and I had enough posts showing me that Machinekit does indeed have the jog while paused. So we went over there to check it out yes they have it and we played with it on the sim and thought maybe we would make the switch. We have come to find out that Machine kit does not (readily) support the 7i80 Ethernet set-up we are running. Really had no desire to make the switch but it would have been worth it to have a jog while paused option. Looks like we will be staying on LCNC and trying to play with any options that come our way using LCNC and gmoccapy. Just updating the followers of the jog while paused saga..LOL All of this may be easier if we understood the working of the code both Linux and LCNC we are learning but it is a steep curve. Dewey Garrett is working on a version of JWP for LinuxCNC. It's very different from what Machine kit is doing, and has different limitations. It's implemented as a HAL circuit, so it's minimally invasive, so i'm hoping to merge it for LinuxCNC 2.7. Here's the demo he posted this morning: https://www.youtube.com/watch?v=8QGOj39I-kk Looks a bit puzzling Seb, as we can't see how the machine is reacting, and what he is doing with the pulldown is not visible in the backplot. Cheers, Gene Heskett -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] LCNC VS Machinekit JWP
On 11/25/14 3:24 PM, Gene Heskett wrote: On Tuesday 25 November 2014 16:44:01 Sebastian Kuzminsky did opine https://www.youtube.com/watch?v=8QGOj39I-kk Looks a bit puzzling Seb, as we can't see how the machine is reacting, and what he is doing with the pulldown is not visible in the backplot. Yes, Dewey's moveoff system behaves differently from normal jogs. The offset is handled separately from the machine's nominal controlled point, so the DRO and the backplot do not reflect the JWP motion. You use the buttons on his JWP window to move, instead of the normal jog buttons or jog wheel. -- Sebastian Kuzminsky -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] LCNC VS Machinekit JWP
That is a bit confusing I agree. If the outputs are showing the movements then I guess you can assume the machine is moving. I wonder how difficult it would be to get the display to show what he is doing. Also I am sure this is a preliminary setup so do you see some buttons or something to allow a one push button jog instead of having to type in what you want? I am pleased someone is looking into doing this. Thanks to Dewey for stepping up to the plate. Is he on IRC? What is his login there? I am kinda bummed to hear that Machinekit's setup does not work with the mesa stuff which will be on both of my CNC machines here soon. Peace Pete On Tue, Nov 25, 2014 at 5:27 PM, Sebastian Kuzminsky s...@highlab.com wrote: On 11/25/14 3:24 PM, Gene Heskett wrote: On Tuesday 25 November 2014 16:44:01 Sebastian Kuzminsky did opine https://www.youtube.com/watch?v=8QGOj39I-kk Looks a bit puzzling Seb, as we can't see how the machine is reacting, and what he is doing with the pulldown is not visible in the backplot. Yes, Dewey's moveoff system behaves differently from normal jogs. The offset is handled separately from the machine's nominal controlled point, so the DRO and the backplot do not reflect the JWP motion. You use the buttons on his JWP window to move, instead of the normal jog buttons or jog wheel. -- Sebastian Kuzminsky -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Pete Matos A and N Precision and Fabrication Maryville, Tennessee 865-236-8996 -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] LCNC VS Machinekit JWP
On 11/25/2014 5:36 PM, Pete Matos wrote: I am kinda bummed to hear that Machinekit's setup does not work with the mesa stuff which will be on both of my CNC machines here soon. I've got a 7i43 Mesa board working with Machinekit and I have heard that the 5i20 works fine. I would think that the 5i25 would also work.. Dave --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] LCNC VS Machinekit JWP
On Tuesday 25 November 2014 17:27:32 Sebastian Kuzminsky did opine And Gene did reply: On 11/25/14 3:24 PM, Gene Heskett wrote: On Tuesday 25 November 2014 16:44:01 Sebastian Kuzminsky did opine https://www.youtube.com/watch?v=8QGOj39I-kk Looks a bit puzzling Seb, as we can't see how the machine is reacting, and what he is doing with the pulldown is not visible in the backplot. Yes, Dewey's moveoff system behaves differently from normal jogs. The offset is handled separately from the machine's nominal controlled point, so the DRO and the backplot do not reflect the JWP motion. You use the buttons on his JWP window to move, instead of the normal jog buttons or jog wheel. And the secret sauce then is an offset module spliced into each axis? A bit ungainly with the mouse, but certainly seems doable, with any version of LCNC that uses hal. Does he have a downloable version we can just wire into hal yet? Thanks Seb. Cheers, Gene Heskett -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] LCNC VS Machinekit JWP
Dnia 25-11-2014 o godz. 23:36 Pete Matos napisał(a): That is a bit confusing I agree. If the outputs are showing the movements then I guess you can assume the machine is moving. I wonder how difficult it would be to get the display to show what he is doing. Also I am sure this is a preliminary setup so do you see some buttons or something to allow a one push button jog instead of having to type in what you want? I am pleased someone is looking into doing this. Thanks to Dewey for stepping up to the plate. Is he on IRC? What is his login there? I am kinda bummed to hear that Machinekit's setup does not work with the mesa stuff which will be on both of my CNC machines here soon. Peace Pete mesa 7i80 ethernet driver will be ported to machinekit in a few days. On Tue, Nov 25, 2014 at 5:27 PM, Sebastian Kuzminsky s...@highlab.com wrote: On 11/25/14 3:24 PM, Gene Heskett wrote: On Tuesday 25 November 2014 16:44:01 Sebastian Kuzminsky did opine https://www.youtube.com/watch?v=8QGOj39I-kk Looks a bit puzzling Seb, as we can't see how the machine is reacting, and what he is doing with the pulldown is not visible in the backplot. Yes, Dewey's moveoff system behaves differently from normal jogs. The offset is handled separately from the machine's nominal controlled point, so the DRO and the backplot do not reflect the JWP motion. You use the buttons on his JWP window to move, instead of the normal jog buttons or jog wheel. -- Sebastian Kuzminsky -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Pete Matos A and N Precision and Fabrication Maryville, Tennessee 865-236-8996 -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ac servomotor drive
On 25 November 2014 at 21:07, a k pccncmach...@gmail.com wrote: any between 120-220 V AC Look on eBay and correlate to: http://www.a-m-c.com/products/analog_brushless.html -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] VFD trouble
On 11/25/2014 02:43 PM, Viesturs Lācis wrote: Hello! I need to drive 2 high-speed spindle motors, 3,7 kW each. For that I have 11 kW VFD. The problem is that I attached motors to the drive, tried to run them, but VFD does not increase frequency above 8-9 hertz (all the default frequency values are 50 hertz, I checked them and set to 100 to make sure that it not a problem). And in addition to that motors get really hot in a minute or so. I set no load current to 0,2 A, max current currently is set to 17 A (max current for each motor is 8,7A). You need to set the V/Hz slope in the VFD's settings. Every motor has some V/Hz curve, which is usually a straight-line slope. Different VFDs have different ways of making this setting. For instance, on a particular air bearing spindle motor I use, it wants 80 V at 400 Hz. The other thing is high speed motors have very low inductance. On that particular unit, I needed to add 1 mH inductors in series with all 3 motor wires. This VFD worked fine few weeks ago with 7 kW motor. I checked the motors today with 2kW VFD - worked just fine. Ok, I can decrease max current to 2-3 amps, while testing, probably that should fix the overheating, but why does it not allow to increase frequency? It is probably getting stuck at low speed due to high current. The larger VFD may have a lower PWM frequency, which is causing the peak winding current to exceed the current limit. it suppresses frequency increase, waiting for the motor to catch up and current to go down, which never happens. So, it gets stuck. Sounds like the inductors may be required. Jon -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
2014-11-25 13:58 GMT-03:00 Gene Heskett ghesk...@wdtv.com: That is about 2x what mine can do. I think, not actually measured because it only has a hair over 2.5 of travel. Well this Mazak may be 1983 and for some people DC servos might be obsolete, but when I see how they work I'm still in love with them. The way it behaves is precious. I am sure we've both seen some pretty square camshafts but everytime I think about the roller tappet stuff, I recall the cam and tappets in the Nash Ambassador big 6 engine used from '49 to the end of Nash. That engine was a stroker, at 4 3/8, but it had, from a hot rod viewpoint, every trick in the book, much of which was unlocked if you put the timing gears back in so the cam was a tooth late. Between that and some work on the distributor, there was another 100 horses in there you could take to the starting gate. One of its secrets was the cam follower tappets, huge mushroom faces that just cleared the next one over, fully 2 or a hair more in diameter, with a spherical face radii of about 4 feet. That gave them room for a cam diameter out of sight for most engines, and while the timing was only about 255 degrees, the lift, and squareness of the lift was at least as good as you could get with roller tappets. Combined with tulip'd valves and double springs, and despite the single barreled carb and that covered ditch in the head casting capable of being uncovered and suitably polished, could breath better than anything else on the road at the time, and got phenomenal gas mileage, 20+ at 100 mph doing it. Biggest problem was the puny brakes, nowhere big enough to do a panic stop but once, then you had to replace all the drums, they got that hot warped out of round, about a quarter inch. 9 drums, 1.5 wide in front, 1.25 wide in back IIRC. A joke. But that joke could hang the speedo needle straight down if you wanted it to. As always I like how you describe things like this :). I'm really out of my field wich such a monster like that, but I can imagine that phenomenal gas mileage back then is almost against the law by today standars. I recall talking to somebody a while ago when I was researching about induction heating for camshafts, and the reason most engines are going from flat tappets to roller tappets is because zinc was no more a legal component in motor oils and to avoid premature wear the only reason is to use a system with less friction. I don't remember but the person I talked to may be from this list. Anyway, I remember that because the person told me that there are lot of old monster like the one you mentioned that needed camshaft rebuild because the newer oils are far worse for systems without rollers. -- *Leonardo Marsaglia*. -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
2014-11-25 18:19 GMT-03:00 Dave Cole linuxcncro...@gmail.com: Since you have limited availability of local parts; you might want to consider using some automotive sensors such as the camshaft and crankshaft sensors used by most cars these days. I've replaced some on Fords over the years and they typically fit into a hole recess in the engine block and extend to sense a gear or segmented ring. Around here (Midwest USA) I have seen them as cheap as $15 or so. I believe the sensors I was checking/replacing were run off 5 volt power, so they should not be difficult to interface. Apparently the Ford sensors I was testing were hall effect sensors. More cam and crank sensor info that you probably need. http://www.aa1car.com/library/crank_sensors.htm http://easyautodiagnostics.com/misc-index/ckp-cmp-sensor-basics-1 If you stagger two hall effect sensors on a gear so they are out of phase by 90 degrees, you can create a full quadrature signal fairly easily. If you have a timing belt pulley, that may work as well. Well for the Mazak I can still use the original encoder since I can scale it, even if it's not that exact. But I'm giving it a try since it's already there. I'm planning on using some sensor like the ones you mentioned for the heat treating machine we're finishing to retrofitt because I have some of these encoders without index pulse. The maing thing is I need to position the cam to get a homogeneous heat around the profile. The idea of making the 360 teeht gear is not out of the question either, but I think I'm going to use the encoder and add the physical index with a hall sensor. Here's a link of the process with a round coil, the idea is to use coils with the shape of the lobe. The problem of the non homogeneous occurs more with high lift camshaft. http://youtu.be/RmW3_c0-4Oc. -- *Leonardo Marsaglia*. -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
On 11/25/2014 10:30 PM, Leonardo Marsaglia wrote: 2014-11-25 18:19 GMT-03:00 Dave Cole linuxcncro...@gmail.com: Since you have limited availability of local parts; you might want to consider using some automotive sensors such as the camshaft and crankshaft sensors used by most cars these days. I've replaced some on Fords over the years and they typically fit into a hole recess in the engine block and extend to sense a gear or segmented ring. Around here (Midwest USA) I have seen them as cheap as $15 or so. I believe the sensors I was checking/replacing were run off 5 volt power, so they should not be difficult to interface. Apparently the Ford sensors I was testing were hall effect sensors. More cam and crank sensor info that you probably need. http://www.aa1car.com/library/crank_sensors.htm http://easyautodiagnostics.com/misc-index/ckp-cmp-sensor-basics-1 If you stagger two hall effect sensors on a gear so they are out of phase by 90 degrees, you can create a full quadrature signal fairly easily. If you have a timing belt pulley, that may work as well. Well for the Mazak I can still use the original encoder since I can scale it, even if it's not that exact. But I'm giving it a try since it's already there. I'm planning on using some sensor like the ones you mentioned for the heat treating machine we're finishing to retrofitt because I have some of these encoders without index pulse. The maing thing is I need to position the cam to get a homogeneous heat around the profile. The idea of making the 360 teeht gear is not out of the question either, but I think I'm going to use the encoder and add the physical index with a hall sensor. Here's a link of the process with a round coil, the idea is to use coils with the shape of the lobe. The problem of the non homogeneous occurs more with high lift camshaft. http://youtu.be/RmW3_c0-4Oc. I re-controlled a very similar induction heat treat machine for a local heat treating shop. They usually heat treat linkage pins for farm tractors on that machine (John Deere is one of their customers). It's very impressive how quickly they can bring a solid bar of steel to a cherry red color with that machine. I used Mach3 and a PLC to do the re-control ( a few years ago). Mach3 serves as the user interface and the PLC does all of the machine logic. I tore off the old vertical motion motor and installed a new AC servo drive.The first one, a Parker servo drive couldn't deal with the RF noise. So I tried a cheaper Automation Direct servo drive and it has been running everyday for years now. It took them only a short period of time to figure out how to write G code programs do different parts. Dave --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
On Tuesday 25 November 2014 22:17:22 Leonardo Marsaglia did opine And Gene did reply: 2014-11-25 13:58 GMT-03:00 Gene Heskett ghesk...@wdtv.com: That is about 2x what mine can do. I think, not actually measured because it only has a hair over 2.5 of travel. Well this Mazak may be 1983 and for some people DC servos might be obsolete, but when I see how they work I'm still in love with them. The way it behaves is precious. I am sure we've both seen some pretty square camshafts but everytime I think about the roller tappet stuff, I recall the cam and tappets in the Nash Ambassador big 6 engine used from '49 to the end of Nash. That engine was a stroker, at 4 3/8, but it had, from a hot rod viewpoint, every trick in the book, much of which was unlocked if you put the timing gears back in so the cam was a tooth late. Between that and some work on the distributor, there was another 100 horses in there you could take to the starting gate. One of its secrets was the cam follower tappets, huge mushroom faces that just cleared the next one over, fully 2 or a hair more in diameter, with a spherical face radii of about 4 feet. That gave them room for a cam diameter out of sight for most engines, and while the timing was only about 255 degrees, the lift, and squareness of the lift was at least as good as you could get with roller tappets. Combined with tulip'd valves and double springs, and despite the single barreled carb and that covered ditch in the head casting capable of being uncovered and suitably polished, could breath better than anything else on the road at the time, and got phenomenal gas mileage, 20+ at 100 mph doing it. Biggest problem was the puny brakes, nowhere big enough to do a panic stop but once, then you had to replace all the drums, they got that hot warped out of round, about a quarter inch. 9 drums, 1.5 wide in front, 1.25 wide in back IIRC. A joke. But that joke could hang the speedo needle straight down if you wanted it to. As always I like how you describe things like this :). Thanks for the flowers, but that just encourages me as you will see. I'm really out of my field wich such a monster like that, but I can imagine that phenomenal gas mileage back then is almost against the law by today standars. Yeah. Now my 99 GMC 3 door gets about that. But the '88 Nissan Frontier pickup in front of it only got 10 on a good day. I recall talking to somebody a while ago when I was researching about induction heating for camshafts, and the reason most engines are going from flat tappets to roller tappets is because zinc was no more a legal component in motor oils and to avoid premature wear the only reason is to use a system with less friction. I don't remember but the person I talked to may be from this list. Anyway, I remember that because the person told me that there are lot of old monster like the one you mentioned that needed camshaft rebuild because the newer oils are far worse for systems without rollers. That change in the motor oils is quite some years back, And zinc may have been part of it, but I am thinking they were also using some variation of TEL that they were worried about worse than the zinc, and it ate every chevy v8's cam away in 10k miles or less when it happened. I've seen the yappets missing the bottom .1 inches, all hollowed out and cams that had less than .1 lift left. And the guy said it just didn't have the giddyup it used to have. Not to mention that because the foot was tickling the pistons to get it up to the national 55, its original 7 mpg the Bro-in- Laws box van once got, was down to about 1.5 mpg running fat enough you could still smell raw gas in the smoking exhaust. Circa 1982? TOF's (The Old Fart) memories for dates never was all that good, and getting worse. Is GM's patent on hydraulic roller tappets still in force? They were royalty hungry yet in the late 40's clear into the 70's with that, first designed and used in the 35 V16 engines they made for the biggest Caddies from 35 to 37. Except for its poured rod bearings, that engine could be made up nearly 300 horses from its original 165, then 185, by swapping the rods out for inserted versions, swapping the oil pumps plumbing around to feed a drilled crankshaft, giving it excellent longevity, and swapping the intake manifolds from side to side, which put the carb flanges upright replace the OEM updraft Marvel-Shebler carbs with a pair of bolt them on, Stromberg 48's, the 94's big brother. I've had the pleasure and phenomenal good luck in seeing two of the 35 of those made, one was Concours De Elegance stock, owned by the undertaker in Buffalo Missouri, and which was used to haul my grandfather from his little farm in Preston Mo to the shop in Springfield, 120 miles, when grandpa blew an ulcer in the middle of the night. And he did it in that 1937 Caddy hearse in about 65 minutes.
Re: [Emc-users] Semi OT: Rotary encoder Z pulse alternatives
On 11/25/2014 2:19 PM, Dave Cole wrote: Since you have limited availability of local parts; you might want to consider using some automotive sensors such as the camshaft and crankshaft sensors used by most cars these days. Also have a look at vehicle speed sensors on the outputs of transmissions. In the later 90's General Motors went to a 40 tooth reluctor and a Hall effect sensor on the output shaft of the 700R4 transmission, also known as the 4L60 or 4L60E (E for Electronic control). The reluctor is removable from the shaft and has a pretty good sized inside diameter. General Motors part number 24202711 for the reluctor ring. The sensor is part number 8673299 but other Hall effect sensors should work. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
