I have a diy (mdf with steel reinforcement) router machine for wood routing. The cutting area is 20" x 40". I'm running Mach 3, with 425 oz/in nema 23 steppers, C-10 bob, 1/2-10 Acme lead screws, and a 24v power supply. My machine runs smoothly at 35 ipm. When I try to increase this in motor tuning the motors "whine" and the gantry stops moving or "slips". There is not a lot of friction in the machine as it moves quite freely when I hook up my 14v cordless drill to the leadscrews. Does anybody have any ideas as to some good starting settings for velocity and accel? I would like to get this to 80-100 ipm. I was told that a Smoothstepper might accomplish this by changing the connection from parallel port to usb. Is this correct? Any other ideas? How do some of these machines with smaller steppers possibly run at 200-300 ipm and more?

Thanks, Jeff