Blackalloy model 252S-30TPK10 drill units 3" stroke with 1" stroke Deschner feed control cylinders. The motors are Leeson 3/4 HP @ 3425 rpm inverter duty motors. The units are handed for horizontal mounting , opposing each other and used in pairs. The variable frequency drives are for controlling speed . The drives are very cost effective to purchase and are recommended over going with DC motors and controllers , there is virtually no maintenance with the AC motors.
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