Get a HobbyCNC drive, run at 36V, go back to the smaller motors, and switch to acme screws, preferably 1/2-8 2 start or similar, and you may get 150-200ipm. Hard to say without seeing the machine. You're probably getting resonance from full step drives. Microstepping will help minimize it and give you more speed. Also, on larger motors, torque drops off very rapidly as rpm's increase. It's very possible that at ~300rpm, that the 282oz motor would have more torque than the 1200 motor.
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Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |