Re: Power Supply

--- In CAD_CAM_EDM_DRO@y..., "studleylee" <indigo_red@q...> wrote:
> Hi,
> I would shoot for a supply in the 50vdc-70vdc range. The higher
> the voltage, the faster the drive can get the stepper coils up to
> the current limit(slew rate) and so you'll get higher potential
> speed. If you run too near the upper supply limit of the gecko,
the
> inertia of the table may cause the stepper to 'pump-up' the
voltage
> during coasting, and could exceed the 80vdc. Then you'd need to
add
> a power-dump circuit.( there on in the files from Mariss )
>
> 1070 oz-in is more than enough for most machines. My mill has a 1:2
> ratio on the steppers(1100oz-in)to the leadscrew, but it also
could
> move a truck and is overkill. Your going to have more friction and
> backlash with regular leadscrews vs the more desirable ballscrews.
If
> you just need these motors for power feed that will be ok. If your
> trying to do precision( repeatable) work, its not so good.
> Hope this helps,
> Lee
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., "bdrmachine" <bdrmachine@h...> wrote:
> > I need a good source for a power supply to drive three
GeckoDrive
> > G201A's, driving three Sanyo Denki 426-1070-DB steppers. The
> > steppers are 1070 oz-in, 6 amp, 2.4 volt, .4 ohm motors. The
> driver
> > take a input voltage of 24-80 volts. Is it better to stay in
the
> > upper range of voltage, 75 volts instead of 24 volts? If so
why?
> >
> > Are these motors large enough for direct driving a Bridgeport
clone
> > with standard lead screws? If not would they work if I up grade
to
> > ball screws?
> >
> > Thanks
> > Brian
> >
> > P.S.
> > I can't close without saying THANKS for the past replies / help.