Hi,

Is there a way or trick to reduce the chatter when turning large diameter pieces on a lathe? Like what they call Spindle Speed Variation in the video.

https://www.youtube.com/watch?v=7sMtUlyQFA4

I've looked into doing this before but gave up on the idea since it really wouldn't make a difference in our shop.
However, since it is dealing with the spindle speed while it is running; it would have to be a motion controller thing and not something from Mach.
I could be wrong and there might be a way to do it in Mach; I'll let others chime in, but I really think it is a motion controller thing.
I was going to do it with a PLC that sent the analog voltage to my spindle drive.  That would be out of the Mach4 loop and I could do whatever I want with the Analog output going to the drive.  You could still set up DROs that would give you the time to change the speed and the range of the speed and let a PLC read those and make the adjustments.