Re: small 3-axis micro stepper

--- 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