RE: [CAD_CAM_EDM_DRO] Re: Stepper on a spindle

Hi Mark,

Good to hear from you! If the spindle is driven by belt or gear, he can
probably cut down on some of that microstep reduction needed.

Dave M. and I have been working on a "stepper pulser" that might be helpful
to those wanting a stepper driven spindle as well. It's just a little PIC
to generate ramped steps for a stepper. It's also useful for a "power feed"
for a lathe. The little side project was inspired by discussions on the
E-leadscrew list recently started.

Alan KM6VV
'been thinking about a stepper driven spindle.

> Big problem is when you want to run "normally", that is, set
> the spindle turning and keep it going forever while the other
> axes follow instructions. But if it is supplied with steps from
> an independent source, should be no problem.
>
> You'll want to think about steps/revolution...
>
> If you want resolution of .001, on a 10-inch diameter workpiece,
> you'll need roughly 31,000 steps/rev; at 10-microstepping using
> motor spec'd at 200 full steps/rev, you'll need a 20:1 reduction
> ratio. Using Mach3 with 25,000 step/sec pulse rate, you'll get
> spindle speeds in the area of 1/second or 60rpm.
>
> /mark who has been there
>