What is the best way to drive a 4hp, 90VDC, 40A spindle motor on a Hardinge CHNC? Some of the large DC motors I have seen, look like universal motors which would operate on AC or DC. Does anyone know if the CHNC spindle motor could work on AC? I'm thinking, a few dimmer switches in parallel and a stepper to turn the dials ;). I wonder if it would be cheaper to go with a 3-phase motor and VFD. Thanks. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending)
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