AC to DC conversion. - Woodworking Talk - Woodworkers Forum
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post #1 of 5 Old 12-28-2009, 02:03 PM Thread Starter
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AC to DC conversion.

The motor on my old craftsman lathe bound up on me last week. I thought this would be a good time to try and swap to an DC motor so I can have a variable speed motor. I've heard it's common to use a treadmill since it already has the AC to DC converter, motor, and speed controller. Has anyone here done this swap? I have a buddy that has a treadmill he's going to give me for this, but I want to get as much info on the swap before I start tearing into it.
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post #2 of 5 Old 02-08-2010, 08:14 PM
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DC conversion

This might not be worth it, but you can get an AC VFD for your lathe. sells a 1/2HP VFD for less than $120. You need a 3phase AC motor, but if you can scrounge one, worth it from my experience.
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post #3 of 5 Old 02-21-2010, 10:30 PM
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Not sure if you have or haven't done this yet since this is an older post(and I don't get on here as often as I should), however I just did the treadmill conversion to my Shopsmith in January.

It went very well, I was able to find a treadmill for free that had a 1.5hp DC motor in it. I stripped the entire treadmill of its components and basically all I did was shorten up the wiring and move the components to a different box. I left the flywheel on the motor and decided to use it for my pulley. I clamped the motor to my bench, hooked all the wiring up and turned it on and ran it slow while I took a bastard file and cut a groove into the pulley. It took a little while, maybe 30 min or so to get it where I wanted it. The control board had 4 POT adjustments on it, 2 were for speed(low and high end) the others I figured out were for torque and governor response to a load.

Overall I have to say that I love the results, especially considering the conversion cost me a whole $15. I have the speed range set from roughly 100rpm -3000rpm with good response to loads. I have another old Shopsmith that is waiting for its overhaul and I will be doing the same conversion to that one as well. I have only 1 complaint, and that is it has a built in time delay on start up. Turn it on and count to 5 then it starts nice and slow. Not really much of a pain just takes some getting used to.

The gray box with the dial is my control box.
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post #4 of 5 Old 02-22-2010, 09:19 AM Thread Starter
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Thanks for the reply! Your the first person I've been able to find that has done this to their lathe. I haven't had time to do the swap yet since I've had to much to do on the house and other projects. Hopefully I'll be able to work on it soon.
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post #5 of 5 Old 02-24-2010, 09:14 AM
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Back on Woodcentral several years ago there was a discussion about using treadmill motors. You might be able to do a search there and find the info. go to the turning messageboard.
There was also a way to bypass the slow start function. I bought 3 of the motors and controllers but was only successful in getting one of them to work. I had controller problems with the other 2 and have never been able to even get the motors to work.
If you use one straight from the machine without modification It should work fine.
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