MC-30 motor controller

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http://forum.allaboutcircuits.com – I am adapting a MC-30 speed controller and a 90v 8 amp dc treadmill motor for a drill press. I tried getting the speed controller to work with the motor and wire the potentiometer. Unfortunately i can not get the motor to run correctly. I used a 50k pot which had 6 pins in which i used 3 this being because i had one at hand. The motor will turn on but will turn off then back on. Is this because of the high resistant poteniometer or just because i wired the pot incorrectly? (Embedded)