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Circle cutting tool

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Started gathering bits for this today. All told I’m out $7 and some fuel in the pickup.

The cutting torch tip doesn’t fit in either chunk of round tube, so I’ll have to chuck the thick walled one in a lathe and punch it out. I’m thinking 1/2-3/4” total length when done, then weld it to the end

The piece that slides on the rod I think I’m going to find something thick wall, or solid stock, that I can tap threads into directly. Then I can use a bolt and a jam nut

I think I need to figure out how high I need the torch tip to be off the material being cut, then the two support legs get cut a little longer to give me that clearance

Feel free to chime in, I’m just winging this, I don’t feel there’s a right or wrong way to go about this