Easier said than done:)binbin wrote:Probably easier to start from scratch. Thread a bar. Form the required steps for the movement. Part off and finish.
Making an internal threaded tube to hold it would work also, but the steps involved are more than starting from scratch.
You could also try to protect the threads and install the piece in the lathe chuck. I would use a four jaw as opposed to a three to spread the load around . (Less pressure on four points instead of three). There might be a little damage to the threads at four points, but you can clean that up and they will still work. I would try some thicker plastic on the jaws of the chuck. Heat it slightly before tightening down. I have also got lucky with stuff like this using large heat shrink tubing. I used two layers and not a scratch on the threads.
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