found out my belt speed was so slow that it was perfect for wood but horribly slow for steel. Getting a new pulley made the is sized to run the belt at its maximum speed so the need for a speed controller is apparent. Son in law talked with a electrician and he said not all 220 volt single phase will survive being hooked up to a speed controller. Current motor is a capacitor start model C319 TEFC 220 volt single phase. No luck finding the answer one way or the other. So what type of speed controller motor combination are people using?