Servo motor help

Since this topic just came up while I was trying to get my router drive
going I thought I could get a little help.
I have Cleveland Motion Control Servos that run 6000 rpm when hooked
directly 60Vdc and draw about 300mA, but when connected to my Gecko 320
and apply a step rate of 30000 with TCNC, I only get about 450 rpm out
of the motor and a whole bunch of heat. The only gecko tuning that I
have done is by sound, I will break out the scope this weekend to see
how well I did. My intent was to run them around 4000 rpm into a 40:1
reducer (came with motor) and then to a 1" spur gear to my rack. This
would give about 315 ipm rapids for wood routing. I guess adding the
step multiplier would get me to 4500 rpm but what about the heat? The
motors are MH2630 with a continuous torque of 70 oz/in and a peak of
350 in/oz.

Thanks for the help

Rob Miller
Danville, CA