Hey Blaise. Happy you’re enjoying the process. That the controller returns back to the index with one tenth or any other move, proves that the motor/servo drive system is not loosing position, does not mean that the machine is equally returning back to a physical position within one ten thousand. That will depend on overall backlash. That the servo motor/servo drive does not loose position is granted by default, otherwise it would be hell, I for example command my servo drives with 8000 pulses per revolution, imagine it would miss even a few pulses here and there. Like I said, happy you’re having fun. Looking forward to see more updates.
Hi P. Lopes! Yes, I must admit, I absolutely love doing this! It is so satisfying when it finally works! Hahaha! I should have specified that ending up on the encoder index does not include the backlash. The backlash on the Y axis is about 2 tenth. I think this backlash is mainly coming from the angular contact bearings holding the ball screw. Anyhow, I can live with a few tenth! I also use 8000 PPR since I have setup the drive to use the rising and the falling edges of both channels. Have you installed a encoder on your spindle? Fore 5000RPM, what type of resolution encoder should I use you think?
@@BlaiseBarrette I have not installed an encoder on the spindle since I use a servo motor. The servo motor has an integrated encoder that the servo drive uses. I then have two options with the servo drives I use and considering that I use the Mesa 7i25 with 7i76 which has encoder inputs, I can setup the servo drive to output a simulated encoder signal that is fed to the 7i76 and use it on LinuxCNC to do rigid tapping and spindle orient, this was how I first set it up. However instead I now have the servo drive controlled via beckhoff ek1100(ethercat) + el6751 (canopen). Via canopen I can retrieve the current rotational position/speed/current/etc and control speed, torque, etc. with a software pid based on the rotational position I can orientate the spindle. I did have to install an inductive sensor on the spindle to assist spindle orientation since I don’t have a 1:1 ratio between the servo motor and spindle and needed an absolute physical reference - like a home switch.
@@BlaiseBarrette regarding which encoder could you use for the spindle. 5000 rpm times the encoder resolution needs to be smaller than your cnc controller can handle. The Mesa 7i76 can handle 2mghz, check yours. You don’t need a high resolution to manage speed and angular position for spindle orient. For rigid tapping you just need one pulse per revolution. Perhaps 400 ppr would be ok. That gives 0,9 degree resolution for spindle orient and 1.6mhz impulses for you cnc controller to handle. If you can use 1000ppr, better.
Wow. The more you tel me about your setup the more impressed I am! I was gonna go for a 500 ppr encoder on the spindle motor. I’ll have to put the motor shaft on a lathe to make a threaded hole to adapt an encoder. We’ll se when we get there!
I go over most of it in my previous video ruclips.net/video/_br0LrHcUlg/видео.html. From what I understand, LinuxCNC is a great choice! My best advice going forward in such project is to make sure you are not in a hurry to make chips again… It can take a lot of time! Enjoy the process!
@@BlaiseBarrette Duly noted! I'll get to it evnetually. I really don't like the old industrial controls. I've been spoiled by great probing routines, 500 wcs offsets, 999 tool table...
Tu étais-tu vraiment super super happy!!! On a constaté ça, le matin au travail !!! Good job
Hahaha!
Amazing, as you said!
Hey Blaise. Happy you’re enjoying the process. That the controller returns back to the index with one tenth or any other move, proves that the motor/servo drive system is not loosing position, does not mean that the machine is equally returning back to a physical position within one ten thousand. That will depend on overall backlash. That the servo motor/servo drive does not loose position is granted by default, otherwise it would be hell, I for example command my servo drives with 8000 pulses per revolution, imagine it would miss even a few pulses here and there. Like I said, happy you’re having fun. Looking forward to see more updates.
Hi P. Lopes! Yes, I must admit, I absolutely love doing this! It is so satisfying when it finally works! Hahaha! I should have specified that ending up on the encoder index does not include the backlash. The backlash on the Y axis is about 2 tenth. I think this backlash is mainly coming from the angular contact bearings holding the ball screw. Anyhow, I can live with a few tenth! I also use 8000 PPR since I have setup the drive to use the rising and the falling edges of both channels. Have you installed a encoder on your spindle? Fore 5000RPM, what type of resolution encoder should I use you think?
@@BlaiseBarrette I have not installed an encoder on the spindle since I use a servo motor. The servo motor has an integrated encoder that the servo drive uses. I then have two options with the servo drives I use and considering that I use the Mesa 7i25 with 7i76 which has encoder inputs, I can setup the servo drive to output a simulated encoder signal that is fed to the 7i76 and use it on LinuxCNC to do rigid tapping and spindle orient, this was how I first set it up. However instead I now have the servo drive controlled via beckhoff ek1100(ethercat) + el6751 (canopen). Via canopen I can retrieve the current rotational position/speed/current/etc and control speed, torque, etc. with a software pid based on the rotational position I can orientate the spindle. I did have to install an inductive sensor on the spindle to assist spindle orientation since I don’t have a 1:1 ratio between the servo motor and spindle and needed an absolute physical reference - like a home switch.
@@BlaiseBarrette regarding which encoder could you use for the spindle. 5000 rpm times the encoder resolution needs to be smaller than your cnc controller can handle. The Mesa 7i76 can handle 2mghz, check yours. You don’t need a high resolution to manage speed and angular position for spindle orient. For rigid tapping you just need one pulse per revolution. Perhaps 400 ppr would be ok. That gives 0,9 degree resolution for spindle orient and 1.6mhz impulses for you cnc controller to handle. If you can use 1000ppr, better.
Wow. The more you tel me about your setup the more impressed I am! I was gonna go for a 500 ppr encoder on the spindle motor. I’ll have to put the motor shaft on a lathe to make a threaded hole to adapt an encoder. We’ll se when we get there!
Lookin Good...
Thanks D J !
@@BlaiseBarrette I'm still interested in The Axis Drives Maybe the Resolvers' as well. Yours is DC correct?
Thanks Ontario here.
Yes I did not forget. When I’m ready, you’ll be the first I call. I the mean time, if you are in trouble and need a specific part, let me know!
I must have missed it. Do you talk about what control you are using? I would love to convert my Fadal VMC15-XT to LinuxCNC!
I go over most of it in my previous video ruclips.net/video/_br0LrHcUlg/видео.html. From what
I understand,
LinuxCNC is a great choice! My best advice going forward in such project is to make sure you are not in a hurry to make chips again…
It can take a lot of time! Enjoy the process!
@@BlaiseBarrette Duly noted! I'll get to it evnetually. I really don't like the old industrial controls. I've been spoiled by great probing routines, 500 wcs offsets, 999 tool table...