Lathe C -Axis
05 Jun 2018 17:46 #111689
by dextaca
Lathe C -Axis was created by dextaca
Good Day All.
Have a quick question. Doing a retro on our older WSC-6 ( Murata lathe ) and wondering if c-axis is feasible with LinuxCNC since the spindle motor is a full blown servo spindle ( Mitsubishi / VFD, motor has internal encoder and external encoder attached directly to the spindle for real spindle position. ) I went trough the posts and saw a post from Andy about it.. any news?
regards
Peter
Have a quick question. Doing a retro on our older WSC-6 ( Murata lathe ) and wondering if c-axis is feasible with LinuxCNC since the spindle motor is a full blown servo spindle ( Mitsubishi / VFD, motor has internal encoder and external encoder attached directly to the spindle for real spindle position. ) I went trough the posts and saw a post from Andy about it.. any news?
regards
Peter
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06 Jun 2018 17:15 #111771
by andypugh
Replied by andypugh on topic Lathe C -Axis
Yes, it shouldn't be too hard. I nearly managed it with an ordinary induction motor spindle.
You might want to decide if you want to use it as a full C axis, or use M19 spindle orient.
You might want to decide if you want to use it as a full C axis, or use M19 spindle orient.
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06 Jun 2018 18:37 #111778
by dextaca
Replied by dextaca on topic Lathe C -Axis
Hi Andy Nice to hear from you.. Full C axis with french fries please..
If possible. Could you shed some light on how to?
Thank you Peter
If possible. Could you shed some light on how to?
Thank you Peter
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07 Jun 2018 00:20 #111805
by andypugh
Replied by andypugh on topic Lathe C -Axis
Well, first you have to decide on how you want to switch between C-axis and normal spindle control.
One way might be to always drop back to C-axis closed-loop when the spindle is turned off. That could probably work, but might make getting the chuck key in difficult, or clocking up work in the 4-jaw chuck. So to make that decision requires consideration of how you expect to work. (Those considerations are irrelevant with a power chuck and bar-feeder.)
If switching that way then I think I would be looking at writing a custom HAL component that feeds the PID with a target position 2 full revs in the future when the spindle speed drops below a threshold.
One way might be to always drop back to C-axis closed-loop when the spindle is turned off. That could probably work, but might make getting the chuck key in difficult, or clocking up work in the 4-jaw chuck. So to make that decision requires consideration of how you expect to work. (Those considerations are irrelevant with a power chuck and bar-feeder.)
If switching that way then I think I would be looking at writing a custom HAL component that feeds the PID with a target position 2 full revs in the future when the spindle speed drops below a threshold.
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