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Thanks for the update Bob.
That is what I am trying to figure out. The revs can be quite slow and I am wondering how to drive such slow revs. You indicate about 7.5"/min is good for TIG. So welding a 2.375" dia. tube would be about 1 rpm but if you were welding a 14" dia. car rim then the rpm is slowed down to about 1/5 RPM. That is a 5:1 ratio and I was wondering how to get that kind of range in a power supply and still have torque at such a low voltage.
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Clever use of the worm drive winch; nice work.
How do you manage the ground connection from the rotating platen / workpiece to the welding rig?
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I'd use a pulse width modulated (PWM) motor control: https://www.amazon.com/Controller-Mo.../dp/B08GC7KDKL with a fixed 12V DC power supply. For anyone not familiar, there are lots of resources for PWM online.
