My cheap Harbor Freight mini mill has a variable speed spindle that is controlled by hand with a knob on the front of the mill. This knob turns a potentiometer. I think all mini mills work like this.
Has anyone interfaced the potentiometer to LinuxCNC? I don't have the schematic for the spindle motor controller but I assume the potentiometer imply sends a control voltage to control the duty cycle of a PWM generator. The motor is a simple DC brushed motor It seems I could use the 0 - 10 volt output from a breakout board (with posible voltage conversion) to control the speed of the spindle. Then I place an encoder on the spindle. Has anyone made a simple interface that replaces the potentiometer? I don't want to rplace the spindle moter and use a VFD. I think this shold be very simple and low-cost. -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
