Several company’s manufacture flex shafts that adapt easily to various electric motors the small tools and drill bits require some serious RPM the perfect candidate here would be a high speed vacuum motor that cranks out a whooping 20.000 rpm. Since the vacuum motor is a brush type motor called a Universal motor a simple light dimmer switch would adjust the speed up or down.
A foot pedal from an old electric sewing machine would probably serve two purposes, to control speed plus start and stop your motor leaving your hands free. The sewing machine motor may also be a candidate for the flex shaft adaption.
If your carving stone wear breathing protection especially soapstone as it is also a carcinogenic
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