If you look at torque curves, you'll see that generally the larger size motors lose torque faster as rpm's increase, so larger motors usually don't spin as fast.
They shouldn't spin only half as fast, though. What drives and what voltage are you using?
__________________
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
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