Re: Servo-PWM-DSP

In a message dated 09/10/1999 2:50:03 PM Hawaiian Standard Time,
dhowland@... writes:

<< and some discussions I've read suggust that you can tell by looking at the
tooled part if a CNC system was controlled by a stepper based or servo based
controller. >>

Dave,
I have cut many parts on both stepper and servo based systems. I know
speed is the biggest difference, the slowest servo system I've played with
moved at 300 inches a min on a G0. In terms of part quality, I think many
more economy machines were built with steppers. Thus the base machine is
often not as stiff or backlash free as you would desire. Given the same basic
frame of a Bridgeport sized mill, I think one would not be able to tell the
difference in part quality if they were both setup properly.
Peter