Re: My Sherline speed

--- In CAD_CAM_EDM_DRO@y..., Tim Goldstein <timg@k...> wrote:
> I would suggest trying another software package. Knowing that
DeskNCRT is
> based upon EMC and that ragged steps are an issue with EMC I would
guess
> that is what you are experiencing. You may want to try CNC Pro
> (www.yeagerautomation.com), Master Control
> (http://users.andara.com/~fenerty/master.htm), or even DanCAD just
to see
> how the speed plays out. You may also want to consider trying full
coil.
> That is how I ran mine and max RPM was not an issue.
>
> Tim
> [Denver, CO]
>
> > -----Original Message-----
> >
> > Thanks for the replies, Chris and Al and Tim
> >
> > The Sherline stepper motor is a Shinano Kenshi SST57D3201.
> > Data sheet is at
> >
> > http://www.shinano.com/pdf/SST57D.pdf
> >
> > It is a 3.2V, 2-amp size 23 motor, double 1/4" shaft, 134
> > oz-in holding
> > torque and about 95 oz-in pull-in torque. I have it hooked
> > up using half
> > the coils (one end plus center tap) and the resistance is
> > called out as
> > 1.6ohm per phase. The chart shows it keeping its full torque
> > out to about
> > 1200pps with a 24V, 2A chopper drive.
> >
> > The computer is a P100, with no provision physically in the case
for a
> > CD-ROM, and I don't plan to use one.
> >
> > The Sherline leadscrews are 20tpi, so 8000 half-steps are an
inch. I
> > should have full torque at 9ipm, and it feels like it. I'm
> > nowhere near
> > maxing out the speed that DeskNCrt is capable of with this
> > processor, but
> > at say 12ipm the mill will miss steps occasionally and
> > randomly. Maybe I'm
> > just hitting a resonance at that speed? I've been sneaking
> > up in speed,
> > but this weekend I'll just try a significantly higher rapid
> > speed and see
> > what happens.
> >
> > But from your post, Al, it sounds like CNCPro would be a good
> > and tested
> > choice. :-)
> >
> > Best regards,
> >
> > Randy
>
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