Peter wrote: > You could use a malta cross mechanism to do the movement. This allows the > motor to pick up speed for 1/4 malta cross drive wheel revolution before > the pin hits a slot and some leeway in starting/stopping the motor. Thus > no load on the motor when starting and you could use a smaller motor. I don't understand this. Doesn't an electric motor have its highest torque at 0 rpm (when stalled)? If that's the case, what good would it do to get the motor going first? Gerhard -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist