Re: Stepper motors ( giants ) cheap.

Tim, Art,
Thanks for the info, it is sure worth thinking about, since the
motors are so cheap, especially for the Z axis of the RF-45, a large
motor for that is very desirable.
Art thanks also for your follow up with more details.
Terry May

--- In CAD_CAM_EDM_DRO@egroups.com, "Tim Goldstein" <timg@k...> wrote:
> From my understanding there is nothing wrong with this approach
other than
> the fact that the high inductance will limit your maximum rpm. The
4"/sec
> figure will not equate on all systems with the 72 rpm limit that are
> mentioned. When you look at Art's machine you will notice he is
using belts
> to move the visible axis's. There are no lead screws that I can
see. The
> point is Art would have far less steps per inch most likely than a
machine
> with screws. On my Shoptask I have 5 tpi ballscrews and 2:1
reduction belts.
> This means I need 10 motor turns for each inch of travel. At 72 rpm
I would
> only be getting a pokey 7.2 ipm or .120"/sec.
>
> Tim
> [Denver, CO]
>
> > -----Original Message-----
> > From: Terry May [mailto:tmay@u...]
> > Sent: Friday, August 18, 2000 9:14 PM
> > To: CAD_CAM_EDM_DRO@egroups.com
> > Subject: [CAD_CAM_EDM_DRO] Re: Stepper motors ( giants ) cheap.
> >
> >
> > Ok everyone,
> >
> > Is there a down side to this other than the speed??
> >
> > I could sure live with 4"/sec. It would be about 1/10 the cost
of
> > comparable torque steppers.
> > Terry May
> >
> >