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A couple of suggestions:
Windshield wiper motors have a lot of torque. I have used one successfully for the over arm on a small grinding machine.
A motor from a treadmill would be ideal.
A small drill press has a good AC motor. You can vary the speed with the pulleys.
I do have an old DC motor. I think it is 1/3 hp. If you want to PM me I would be happy to sell it to you. It doesn't have a gearbox though and would be heavy to post.
Rod.
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