Re: [CAD_CAM_EDM_DRO] Re: Stepper on a spindle

In a pinch, one could use a 555 timer with a pot to adjust frequency. Very
small and cheap circuit. Yes, it won't really generate "pulses" as such, but
"waves", but that's OK for many controllers, because they'll be happy with
just detecting a rising or a falling edge. That's how I drive the leadscrew
on my lathe, by the way. A little primitive perhaps, but works well enough
for me.

Vlad

On 1/12/06, Alan Marconett <KM6VV@...> wrote:
>
> 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
> >
>
>
>
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--
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http://www.krupin.net/serendipity/index.php?/categories/2-metalworking


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