[Emc-users] Linear scales
The Chinese ballscrews are rolled and not therefore not as accurate as ground, or so I have read. However as I'm going to be using servos and linear scales, I can't see this being a problem. Any thoughts on this ? Thanks Wallace. -- 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] Linear scales
On 17 November 2014 21:10, Marshland Engineering marshl...@marshland.co.nz wrote: The Chinese ballscrews are rolled and not therefore not as accurate as ground, or so I have read. It is arguable how much accuracy you actually need. What is the tolerance on 12 distances on the parts you make? LinuxCNC also supports screw-mapping if you can accurately measure the absolute position. -- 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] linear scales Heidenhain
On 12/13/2012 02:07 PM, jean-paul coninx wrote: Dear Viesturs, Thanks for your reply. I m sure that these linear scales from Heidenhain in combination with a Heidenhain controller have a analog output. I also know that some of the Maho mills (from few year later) have a Philips 432 controller. Maybe the glass scales in combination with these controller are quadrture I will look for documantation but I m not sure i can help you . I have only a general service manual for the Maho mh 700c Regards j^p From: viesturs.la...@gmail.com Date: Thu, 13 Dec 2012 19:49:44 +0200 To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] linear scales Heidenhain 2012/12/13 jean-paul coninxjp@hotmail.com: Dear emc users, I am an owner from a maho mhc 700c with a heidenhain tnc 135 controller. The controller doesn t work any more. I have read something about retrofitting. The most people use the Mesa cards in combination with Linuxcnc. For already a few years (no time like everyone) I a bought a Heidenhain EXE 935 convertor ( 3 axis from sinus wave to ttl signal) . The moment I bought these EXE 935 the Mesa 7i49 didnt exist . In my opinion I have two options : Mesa 5i20 + Exe 935 + 7i33 and 2 x 7i37TA Mesa 5i20 + 7i49 + 2 x 737TA Which are the advantages or disadvantages to use the EXE 935 ?? I prefer without (the more I use the more can stop working) Are You sure that linear scales have analog output? I was offered to do a retrofit of Maho MH400P mill, so few months ago I spent few hours going through a thick file of documentation and I remember that I saw something about quadrature TTL signal. I did not pay that much attention to it, because I was looking for instructions how to remove the cover from hydraulic pump. It needs to be fixed and that is a prerequisite for me to get that job. Is there any chance that You have some useful information about servicing hydraulic pump of Your mill? I suspect that they might be pretty similar. -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Heidenhain linear scales are of 2 varieties, both analog sinus output either 11uA p/p (older) or 1V p/p ( newer) both output 2 out of phase sinus that are 'interpolated' to determine the numeric value some have a form of absolute encoding ( Linear Distance Coded), these have an absolute mark every 2 cm and homing is facilitated by moving past any 2 marks, yielding an absolute position without going to extreme end you can get info from heidenhain's website on which EXE to use for the scales you have a heidenhain cnc does not use these EXE's they work directly with the control it's 'sorta like a resolver' :) and EXE boxes are expensive ( i got a set of 4 but i use them :| ) regards Tomp -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear scales Heidenhain
On 14 December 2012 21:13, Thomas J Powderly tomp4...@gmail.com wrote: it's 'sorta like a resolver' :) and EXE boxes are expensive ( i got a set of 4 but i use them :| ) Sounds like an easy enough job for the AtoD on an Arduino. Basically like my Arduino Resolver convertor (abandoned) without the sine-wave generator. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear scales Heidenhain
If you want an in-expensive way to convert Heidenhain 11uA analogue sine wave current output scale signals to TTl then Google 'IC Haus'. They do an evaluation board for their chip 'iC-NV' which with the addition of 2 resistors will convert sine to square with interpolation values upto 16. Tim Sent from my BlackBerry® wireless device -Original Message- From: Thomas J Powderly tomp4...@gmail.com Date: Fri, 14 Dec 2012 15:13:49 To: Enhanced Machine Controller (EMC)emc-users@lists.sourceforge.net Reply-To: Enhanced Machine Controller \(EMC\) emc-users@lists.sourceforge.net Subject: Re: [Emc-users] linear scales Heidenhain On 12/13/2012 02:07 PM, jean-paul coninx wrote: Dear Viesturs, Thanks for your reply. I m sure that these linear scales from Heidenhain in combination with a Heidenhain controller have a analog output. I also know that some of the Maho mills (from few year later) have a Philips 432 controller. Maybe the glass scales in combination with these controller are quadrture I will look for documantation but I m not sure i can help you . I have only a general service manual for the Maho mh 700c Regards j^p From: viesturs.la...@gmail.com Date: Thu, 13 Dec 2012 19:49:44 +0200 To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] linear scales Heidenhain 2012/12/13 jean-paul coninxjp@hotmail.com: Dear emc users, I am an owner from a maho mhc 700c with a heidenhain tnc 135 controller. The controller doesn t work any more. I have read something about retrofitting. The most people use the Mesa cards in combination with Linuxcnc. For already a few years (no time like everyone) I a bought a Heidenhain EXE 935 convertor ( 3 axis from sinus wave to ttl signal) . The moment I bought these EXE 935 the Mesa 7i49 didnt exist . In my opinion I have two options : Mesa 5i20 + Exe 935 + 7i33 and 2 x 7i37TA Mesa 5i20 + 7i49 + 2 x 737TA Which are the advantages or disadvantages to use the EXE 935 ?? I prefer without (the more I use the more can stop working) Are You sure that linear scales have analog output? I was offered to do a retrofit of Maho MH400P mill, so few months ago I spent few hours going through a thick file of documentation and I remember that I saw something about quadrature TTL signal. I did not pay that much attention to it, because I was looking for instructions how to remove the cover from hydraulic pump. It needs to be fixed and that is a prerequisite for me to get that job. Is there any chance that You have some useful information about servicing hydraulic pump of Your mill? I suspect that they might be pretty similar. -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Heidenhain linear scales are of 2 varieties, both analog sinus output either 11uA p/p (older) or 1V p/p ( newer) both output 2 out of phase sinus that are 'interpolated' to determine the numeric value some have a form of absolute encoding ( Linear Distance Coded), these have an absolute mark every 2 cm and homing is facilitated by moving past any 2 marks, yielding an absolute position without going to extreme end you can get info from heidenhain's website on which EXE to use for the scales you have a heidenhain cnc does not use these EXE's they work directly with the control it's 'sorta like a resolver' :) and EXE boxes are expensive ( i got a set of 4 but i use them :| ) regards Tomp -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu
Re: [Emc-users] linear scales Heidenhain
From: jp@hotmail.com To: emc-users@lists.sourceforge.net Date: Thu, 13 Dec 2012 21:07:40 +0100 Subject: Re: [Emc-users] linear scales Heidenhain Dear Viesturs, Thanks for your reply. I m sure that these linear scales from Heidenhain in combination with a Heidenhain controller have a analog output. I also know that some of the Maho mills (from few year later) have a Philips 432 controller. Maybe the glass scales in combination with these controller are quadrture I will look for documantation but I m not sure i can help you . I have only a general service manual for the Maho mh 700c Regards j^p J^P Most of the EXE converters interpolate the signal to gain more resolution. Can you post the model number of the scale it's self? Also some Heidenhain encoders have distance coded indexs which will present a possible problem to deal with. You can buy converter boxes on ebay for not too much if you can wait. Chris M -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] linear scales Heidenhain
Dear emc users, I am an owner from a maho mhc 700c with a heidenhain tnc 135 controller. The controller doesn t work any more. I have read something about retrofitting. The most people use the Mesa cards in combination with Linuxcnc. For already a few years (no time like everyone) I a bought a Heidenhain EXE 935 convertor ( 3 axis from sinus wave to ttl signal) . The moment I bought these EXE 935 the Mesa 7i49 didnt exist . In my opinion I have two options : Mesa 5i20 + Exe 935 + 7i33 and 2 x 7i37TA Mesa 5i20 + 7i49 + 2 x 737TA Which are the advantages or disadvantages to use the EXE 935 ?? I prefer without (the more I use the more can stop working) Regards J^p -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear scales Heidenhain
2012/12/13 jean-paul coninx jp@hotmail.com: Dear emc users, I am an owner from a maho mhc 700c with a heidenhain tnc 135 controller. The controller doesn t work any more. I have read something about retrofitting. The most people use the Mesa cards in combination with Linuxcnc. For already a few years (no time like everyone) I a bought a Heidenhain EXE 935 convertor ( 3 axis from sinus wave to ttl signal) . The moment I bought these EXE 935 the Mesa 7i49 didnt exist . In my opinion I have two options : Mesa 5i20 + Exe 935 + 7i33 and 2 x 7i37TA Mesa 5i20 + 7i49 + 2 x 737TA Which are the advantages or disadvantages to use the EXE 935 ?? I prefer without (the more I use the more can stop working) Are You sure that linear scales have analog output? I was offered to do a retrofit of Maho MH400P mill, so few months ago I spent few hours going through a thick file of documentation and I remember that I saw something about quadrature TTL signal. I did not pay that much attention to it, because I was looking for instructions how to remove the cover from hydraulic pump. It needs to be fixed and that is a prerequisite for me to get that job. Is there any chance that You have some useful information about servicing hydraulic pump of Your mill? I suspect that they might be pretty similar. -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear scales Heidenhain
On 13 December 2012 17:39, jean-paul coninx jp@hotmail.com wrote: I am an owner from a maho mhc 700c with a heidenhain tnc 135 controller. The controller doesn t work any more. I have read something about retrofitting. The most people use the Mesa cards in combination with Linuxcnc. For already a few years (no time like everyone) I a bought a Heidenhain EXE 935 convertor ( 3 axis from sinus wave to ttl signal) . The moment I bought these EXE 935 the Mesa 7i49 didnt exist . In my opinion I have two options : Mesa 5i20 + Exe 935 + 7i33 and 2 x 7i37TA Mesa 5i20 + 7i49 + 2 x 737TA Do you know for sure that the 7i49 works with the Heidenhain scales? I can imagine that it might, but it is really intended for use with Resolvers. I know of someone using Heidenhain scales and the EXE convertors and he is measuring to very high resolution (I think he is managing 10nm resolution and 200nm positioning). It is possible that the FPGA on the 5i20 is too small for the 7i49 firmware. The 5i23 is not a lot more expensive and has a bigger FPGA. I still had to sacrifice one of the encoder counters on my (admittedly unusual) 7i49/7i44/7i39 firmware on the 5i23. Things would be rather tighter on the 5i20. The 7i25 / 7i77 combination might be worth a look, as might the Pico PPMC setup, which is possibly a little more turnkey. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear scales Heidenhain
Hello Andy, Thanks for your reply. I will look for the other Mesa cards and try to discover the differences.. i will keep un touch Regards j^p From: bodge...@gmail.com Date: Thu, 13 Dec 2012 18:13:53 + To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] linear scales Heidenhain On 13 December 2012 17:39, jean-paul coninx jp@hotmail.com wrote: I am an owner from a maho mhc 700c with a heidenhain tnc 135 controller. The controller doesn t work any more. I have read something about retrofitting. The most people use the Mesa cards in combination with Linuxcnc. For already a few years (no time like everyone) I a bought a Heidenhain EXE 935 convertor ( 3 axis from sinus wave to ttl signal) . The moment I bought these EXE 935 the Mesa 7i49 didnt exist . In my opinion I have two options : Mesa 5i20 + Exe 935 + 7i33 and 2 x 7i37TA Mesa 5i20 + 7i49 + 2 x 737TA Do you know for sure that the 7i49 works with the Heidenhain scales? I can imagine that it might, but it is really intended for use with Resolvers. I know of someone using Heidenhain scales and the EXE convertors and he is measuring to very high resolution (I think he is managing 10nm resolution and 200nm positioning). It is possible that the FPGA on the 5i20 is too small for the 7i49 firmware. The 5i23 is not a lot more expensive and has a bigger FPGA. I still had to sacrifice one of the encoder counters on my (admittedly unusual) 7i49/7i44/7i39 firmware on the 5i23. Things would be rather tighter on the 5i20. The 7i25 / 7i77 combination might be worth a look, as might the Pico PPMC setup, which is possibly a little more turnkey. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] linear scales Heidenhain
Dear Viesturs, Thanks for your reply. I m sure that these linear scales from Heidenhain in combination with a Heidenhain controller have a analog output. I also know that some of the Maho mills (from few year later) have a Philips 432 controller. Maybe the glass scales in combination with these controller are quadrture I will look for documantation but I m not sure i can help you . I have only a general service manual for the Maho mh 700c Regards j^p From: viesturs.la...@gmail.com Date: Thu, 13 Dec 2012 19:49:44 +0200 To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] linear scales Heidenhain 2012/12/13 jean-paul coninx jp@hotmail.com: Dear emc users, I am an owner from a maho mhc 700c with a heidenhain tnc 135 controller. The controller doesn t work any more. I have read something about retrofitting. The most people use the Mesa cards in combination with Linuxcnc. For already a few years (no time like everyone) I a bought a Heidenhain EXE 935 convertor ( 3 axis from sinus wave to ttl signal) . The moment I bought these EXE 935 the Mesa 7i49 didnt exist . In my opinion I have two options : Mesa 5i20 + Exe 935 + 7i33 and 2 x 7i37TA Mesa 5i20 + 7i49 + 2 x 737TA Which are the advantages or disadvantages to use the EXE 935 ?? I prefer without (the more I use the more can stop working) Are You sure that linear scales have analog output? I was offered to do a retrofit of Maho MH400P mill, so few months ago I spent few hours going through a thick file of documentation and I remember that I saw something about quadrature TTL signal. I did not pay that much attention to it, because I was looking for instructions how to remove the cover from hydraulic pump. It needs to be fixed and that is a prerequisite for me to get that job. Is there any chance that You have some useful information about servicing hydraulic pump of Your mill? I suspect that they might be pretty similar. -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Linear Scales
Thanks for the replies. Based on your comments, I am backing away from these for the time being. Your comments led me to realize this is beyond my focus at this time. While I certainly could attack this project, family, travel and home renovations are trumping my efforts at this time. As an aside. The three scales are all Mitutoyo, AT2 with 10, 17 and 36 lengths and are series 529. These are certainly older scales since all I could find information on Mitutoyo's were 539 series. They guy has em listed for $130 for all with mounting brackets and the like (no box however). The price seemed reasonable. If anyone is interested in chasing them, search Reading PA craigslist and Mitutoyo and they will pop up. This is the second relisting (that I am aware of) by the seller so its not like they are flying off the shelf. Brian -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Linear Scales
On Sun, 2010-02-28 at 12:36 -0500, BRIAN GLACKIN wrote: ... snip If anyone is interested in chasing them, search Reading PA craigslist and Mitutoyo and they will pop up. This is the second relisting (that I am aware of) by the seller so its not like they are flying off the shelf. Brian Thanks for sharing Brian. I think these could make someone with a manual machine and a DRO very happy. Just in case it might be handy to someone: http://www.wallacecompany.com/machine_shop/EMC2/dro_vfd/ -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Linear Scales
- Original Message - From: BRIAN GLACKIN glackin.br...@gmail.com To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Sent: Sunday, February 28, 2010 11:36 AM Subject: Re: [Emc-users] Linear Scales Thanks for the replies. Based on your comments, I am backing away from these for the time being. Your comments led me to realize this is beyond my focus at this time. While I certainly could attack this project, family, travel and home renovations are trumping my efforts at this time. As an aside. The three scales are all Mitutoyo, AT2 with 10, 17 and 36 lengths and are series 529. These are certainly older scales since all I could find information on Mitutoyo's were 539 series. They guy has em listed for $130 for all with mounting brackets and the like (no box however). The price seemed reasonable. If anyone is interested in chasing them, search Reading PA craigslist and Mitutoyo and they will pop up. This is the second relisting (that I am aware of) by the seller so its not like they are flying off the shelf. Brian -- I have a CNC lathe and CNC mill that both use a setup like you are referring to. It is set up so feedback from the servo motors themselves go to the servo amplifier, and the feedback from the linear scales goes to the CNC controller. That way the servo motor to amplifier is stable independent of backlash between the motor and linear scale. These were both Anilam systems, I converted the lathe to EMC2, plan to convert the mill some day. Roger Neal -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Linear Scales
I may pick up a set of linear scales which were part of a DRO for a milling machine. The DRO box was fried but the scales are reportedly still working. If I get these scales, will I be able to hook them up using one of the available boards (mesa or pico)? I have a 13.5X40 lathe I am considering using these for. Any suggestions including what to look for with used scales are appreciated. Brian -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Linear Scales
I do not know much about scales either, but this website, though selling products, has some useful and general info. http://www.shumatech.com/ Best regards, -- -- Glenn -Original Message- From: BRIAN GLACKIN [mailto:glackin.br...@gmail.com] Sent: Saturday, February 27, 2010 7:22 PM To: Enhanced Machine Controller (EMC) Subject: [Emc-users] Linear Scales I may pick up a set of linear scales which were part of a DRO for a milling machine. The DRO box was fried but the scales are reportedly still working. If I get these scales, will I be able to hook them up using one of the available boards (mesa or pico)? I have a 13.5X40 lathe I am considering using these for. Any suggestions including what to look for with used scales are appreciated. Brian -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Linear Scales
On Sat, 2010-02-27 at 22:21 -0500, BRIAN GLACKIN wrote: I may pick up a set of linear scales which were part of a DRO for a milling machine. The DRO box was fried but the scales are reportedly still working. If I get these scales, will I be able to hook them up using one of the available boards (mesa or pico)? I have a 13.5X40 lathe I am considering using these for. Any suggestions including what to look for with used scales are appreciated. Brian If the scales have quadrature output, then you should be able use a parallel port, Mesa or Pico. http://zone.ni.com/devzone/cda/tut/p/id/4763 http://en.wikipedia.org/wiki/Rotary_encoder Some scales don't use quadrature, so at best, you would need a converter. Using a linear scale for the primary encoder is not recommended. Usually there is a lot of feedback latency between the axis motor and the encoder, which causes feedback loop instability. Some here have used linear scales in combination with motor shaft encoders, but this is not for novice integrators. Compared to a proper motor or ball screw rotary encoder, the most common linear scales don't have very high resolution and rotary encoders can be cheaper. Although this comment may be out of date, because a lot of the newer scales have had pretty high resolutions, but still not like a rotary. You may want to consider fixing the DRO display or selling the scales separately and use the money to get rotary encoders (,or beer). -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Linear Scales
Thanks for the quick reply Glenn and Kirk, The scales are quadrature output - Mitutoyo brand. I recall the list discussion on the difficulty of using the linear scales sometime last year or perhaps earlier. These are available close to me for a decent price so I thought this might be a way to go. Unfortunately the party tossed the DRO box so its just the scales, cabling and brackets. I hope to look closer at them tomorrow and maybe take a chance on them. Thanks again and I am open to any other thoughts. Brian On Sat, Feb 27, 2010 at 11:14 PM, Kirk Wallace kwall...@wallacecompany.comwrote: On Sat, 2010-02-27 at 22:21 -0500, BRIAN GLACKIN wrote: I may pick up a set of linear scales which were part of a DRO for a milling machine. The DRO box was fried but the scales are reportedly still working. If I get these scales, will I be able to hook them up using one of the available boards (mesa or pico)? I have a 13.5X40 lathe I am considering using these for. Any suggestions including what to look for with used scales are appreciated. Brian If the scales have quadrature output, then you should be able use a parallel port, Mesa or Pico. http://zone.ni.com/devzone/cda/tut/p/id/4763 http://en.wikipedia.org/wiki/Rotary_encoder Some scales don't use quadrature, so at best, you would need a converter. Using a linear scale for the primary encoder is not recommended. Usually there is a lot of feedback latency between the axis motor and the encoder, which causes feedback loop instability. Some here have used linear scales in combination with motor shaft encoders, but this is not for novice integrators. Compared to a proper motor or ball screw rotary encoder, the most common linear scales don't have very high resolution and rotary encoders can be cheaper. Although this comment may be out of date, because a lot of the newer scales have had pretty high resolutions, but still not like a rotary. You may want to consider fixing the DRO display or selling the scales separately and use the money to get rotary encoders (,or beer). -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Linear Scales
BRIAN GLACKIN wrote: I may pick up a set of linear scales which were part of a DRO for a milling machine. The DRO box was fried but the scales are reportedly still working. If I get these scales, will I be able to hook them up using one of the available boards (mesa or pico)? I have a 13.5X40 lathe I am considering using these for. Make sure the scales are digital output, not analog. Make sure their basic resolution is acceptable to you. There are some scales that used interpolation to increase the resolution, but those will be analog-output, of course. A .0005 scale may not perform well in a servo application, you probably want a higher resolution one. Also, you can't use linear encoders in a servo positioning system where there is much backlash. .001 might be tolerable, much more than that makes for horrible vibration and servo hunting. Jon -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
