Xerxes-
Thank you for the distinction between s/d and velocity modes.
My next two questions are:
1) I assume velocity mode is the desired mode for a lathe spindle control, but what about cutting threads? There will be a 500-1000 count encoder on the spindle motor, but if velocity mode allows slipping, and the software is out of the control loop, how is thread accuracy held?
2) When I want to use the spindle as a rotary axis, I assume I need to use s/d mode again for position accuracy, correct? Can the VSD-A change between velocity and s/d modes on the fly?
Thanks for the information. The spindle control is still the hazy part of the project for me, especially since I am needing C-axis positioning on the spindle. I am open to any comments and suggestions.
mkuivamaki- have you made any progress on setting up Mach for your spindle? |