Re: [CAD_CAM_EDM_DRO] VFD Feedback

Joe Vicars wrote:

> Does anyone know if VFD's have a feedback loop to keep the motor at a
> specific speed under load? If they do then couldn't you use this for
> threading?

No. The feedback is nowhere near accurate enough for threading.
You need to keep the position accurate to within a few thousandths
of an inch, or things will break, not to mention the threads not fitting.

Since there are usually belts between the motor and spindle, an encoder
on the spindle is completely necessary.

Jon