RE: [CAD_CAM_EDM_DRO] My Sherline speed

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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