Hi Andy.

Sorry for the late reply, lol. I am in Thailand cruising. I used a DC 1/2 hp industrial surplus motor, with a 90 degree gear drive. its 90 VDC brush type motor. Those are common on industrial machinery, like milling machines, and variable drive systems. It uses a simple Pulse Width Modulated driver to set the speed, and the foot pedal turns a 5k potentiometer. Hope you are following... its a bit of engineering, but a straightforward app, the only creativity needed is fabbing brackets and fitting it all into the box.

Best luck, let me know how it works.

I'd be curious to learn more about your motor conversion on your pfaff sewing machine. What motor did you go with? I just bought a 230 with the external motor so am thinking of changing it around to a DC motor. Fair Winds, Andy