Re: USB and ncPOD system

> On Thu, 24 May 2007 20:21:11 -0000, you wrote:
>
>
> >What most users of fractional hp lathe spindles don't realize is that
> >steppers can't keep up with the needed feedrates to accomplish
> >effective metal cutting during threading.
>
> That's a blatantly misleading generalisation.
>
> My stepper driven Z axis can move at 90 ipm if required, most of my
> threading is done at 500-1100 rpm and I've not had it "fail to keep up"
> yet...
>
> Steve Blackmore
> --

The main limitation to threading is the speed at which it can process the encoder signals versus the spindle speed.
Many of the cheaper options cannot get courser than 12 tpi because of this limitation.
The greater the encoder count on the spindle the worse it is and in some ways Mach with the 1ppr encoder is better on course threads.

John S