Terry,
I will be able to tell you tomorrow with 100% certainty but I am sure it doesnt go any deeper. I can easily check tomorrow as the axis DROs are updated from the axis encoders so I will be able to see if they do go to the depth specified in the code.
I believe even with a VFD spindle control is closed loop (assuming you have an encoder on it) I have never tested it as I dont have a VFD spindle on any of my machines, but there is PID tuning for the 0-10v analogue out for VFD spindles.
Hood
Hood