I did some research on the 23 frame motors we're using. They come from Shinano:
You can download a data sheet for the 23 frame motors and torque curves are provided. Typical step rates are nowhere near 1200 RPM. Typical values are 800 to 2000 pps. At 200 steps/rotation this is equivalent to 600 RPM tops, and most are closer to 300 RPM.
This makes me think I'm not doing so badly with 3300 pps. I'd still like to hear from anyone getting faster rates from 23 frame motors.
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Bryan Mumford
Santa Barbara, California
