Re: [CAD_CAM_EDM_DRO] Re: Stepper on a spindle

A simple schmitt trigger will "square up" most any "wave"

- jim

On Thu, 12 Jan 2006 12:34:03 -0800
Vlad Krupin <vlad.cnc@...> wrote:

> 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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> [Non-text portions of this message have been removed]
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>
> Addresses:
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> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
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