RE: [CAD_CAM_EDM_DRO] Re: small 3-axis micro stepper

Part of the problem is the wide range of people represented here. To a
person using salvaged copy machine steppers and driving a Dremel with
threaded rod lead screws, 10IPM rapids are great. Others need or want
100IPM rapids. It all depends on the context.

Speed and accuracy cost money.

I would recommend doing a drawing first. Use pencil and paper if you
must. Don't spend a year designing the machine, just put some things on
paper, look for interferences between parts, and jump in. You may go
through several redesigns while learning, but that's the objective in
some cases. Search the net and read everything you can. Read about high
end systems and distill their ideas down into something usable at your
level. Read about low end systems and learn the things to avoid.

Good luck,
JJ

Be Kind, Be Careful, Be Yourself

> -----Original Message-----
> From: ballendo [mailto:ballendo@...]
> Sent: Tuesday, September 17, 2002 4:08 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: small 3-axis micro stepper
>
>
> Jon,
>
> On my Sherline I get 40-60IPM with a 34v, L297-298 (2A) drive (half
> step modified)
>
> Ballendo
>
> --- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
> > Tim Goldstein wrote:
> >
> > > No offense to Mariss and Gecko as I use his products and think
> they are
> > > great.
> > > <rant>
> > > But, for what ever reason the general thought has become that
> everything
> > > need to run at 20 - 25x rated voltage and have a zillion amps.
> >
> > Where this all come from is the Sherline, with that insane 20 TPI
> leadscrew.
> > This requires the stepper motors to run very fast (for standard 2-
> phase steppers).
> > To get 25 IPM, that requires 25 x 20 = 500 RPM with a direct-drive
> motor.
> > 500 RPM x 200 steps/rev = 100,000 steps/min or 1667 steps/sec.
> While not
> > outrageous, this is getting into the higher performance range of
> many motors.
> > To get any torque at these speeds, your power supply needs to be
> many
> > times the straight IR drop in the windings.
> >
> > > I can
> > > assure you that there are lots of machines happily running on
> Camtronics
> > > controllers that max out at 36 volts and L297/298 setups. Believe
> it or
> > > not I had my Shoptask happily running on 3.? V motors with a 24
> volt
> > > supply and was getting 90 ipm rapids.
> >
> > Well, that's quite respectable! But, I've never seen a Sherline do
> that!
> >
> > Jon
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
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>

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