Lathe Blanks

has anyone made a worm gear on a lathe?

looking to make a 50:1 worm gear and need to know how big the blank needs to be for a 1/2-20 thread

1/2-20 threads call for a 1/2" blank. Be easier to buy a piece of 1/2-20 all thread and use. Cutting threads on a manual lathe is not easy to do.

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