Posted by 1953chevb on September 13, 2020 at 15:36:57:
In Reply to: Internal gears posted by Peter Colman on September 12, 2020 at 11:03:13:
look up broach design on the web, might be able to
push broach a gear if small enough.
no easy task, but it must be tapered and the chip load has to be calculated and the pitch between rows cutting teeth.