Re: [CAD_CAM_EDM_DRO] Controlling VFDs from your PC?

audiomaker2000 wrote:

>
> Hi again!
>
> Could someone give me a quick rundown on how spindle speeds are
> controlled from your PC via VFD or Spindle drive?
> What are the components and what sort of signals are used
> (step/direction?).
> I'm getting ahead of myself in this Bridgeport conversion, but down
> the road it would be nice to have the spindle motor under PC control.

Depends on the VFD, but they might take any of the
following:
- analog 0 to 5V
- analog 0 to 10V
- analog -10 to +10V
- digital (serial) control

You could even attach a stepper motor to the potentiometer
if you wanted to be different!

Doug Fortune
http://www.cncKITS.com