On Thu, 22 Apr 1999 22:13:55 -0400 Your Name writes: >.... and the motor runs fine, except >that it gets really HOT in about 3 minutes. What am I missing? It's the nature of a stepper motor. The constant DC current needed to hold the rotor in position while the motor is not stepping causes a lot of resistive loss. Small motors are designed to just waste this power to heat (in this case, about 2.5 Watts, 12 V x 240 mA). Larger motors are driven with constant current instead, using a switch-mode driver to keep the driver from dissipating a lot of power. Even so, the motor gets hot. Maybe in your case it would be possible to just reduce the motor voltage some when it is not stepping. If the mechanism drivem by the motor will allow it, you could even turn the motor fully off when it's not in use. But it will very likely miss a step or two when restarting. ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866]