Chris,
I never had any resonance problems. how about going to exact stop and doing a little testing.
Here is the link to info on CV settings
http://www.machsupport.com/docs/Mach3_CVSettings_v2.pdfA rather general high level explanation on vibration:
Every thing has a natural frequency. When something either mechanical ( like a tuning fork ) , electrical, even
tool cutting ( chatter ), force from unbalanced object, is at the natural frenquency of another object it will cause it to vibrate. Now once it starts to vibrate and if the exciting forces continue to excite or reinforce the vibration, then the piece can go into resonance. Forces from the resonance can be huge.
So the trick is to eliminate running at or near the natural frequncy of the object ( or a harmonic of the natural frequency ) and in passing a natural frequency spot you want to go through it so you dont' have time to induce resonance.
The gecko site has some info on mid-band resonance relative to their steppers. There have been some posts on CNC
zone which talk about adding a harmonic balancer to stepper motor.
Exactly which CV setting are you talking about in the Mach3 general configuration?
RICH