Re: EMC spindle speed control

--- In CAD_CAM_EDM_DRO@y..., "Marty Escarcega" <escarcega@h...> wrote:

>
> Now the spindle speed control, only think I can think of is to use
> the control input of a VFD. Once set, don't the VFD's remain pretty
> constant? Feedback would be another issue. Only think I could
> think of is a rotary encoder like the one Dan Mauch sells to

provide

> feedback to EMC/Computer.
>

Marty
There shouldn't be any need for feedback. I run two Ahha's that put
out 0 - 10v for the VFD. The machine macro file can be edited so that
you get the right voltage for the speed. On mine I also have a remote
VFD panel that can show amps, speed, volts etc
If I set the machine to say 2500 rpm the machine runs at this speed
and only alters slightly under load VFD display will probably vary
from 2490 to 2520.

John Stevenson