Originally posted by chucketn
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Design by junk box for sure. I've seen several examples online, of people using the bull gear in their lathe to index, thats where the design for the indexing pin and spring came from. As far as everything else, I had some .750 ID bearings, so thats what I used, you could easily use bushings instead. I spaced the bearing centers high enough so that the 72 tooth change gear would clear the milling table. The pin/spring assembly slides in and out in a slot, and locks with a cap head, to accommodate different change gear sizes.
Watch the clearance on the holes in the pin/spring assembly. The only real "looseness" i have in the mechanism is that I bored the hole where the pin passes through the body, nearest the finger knob, a little loose. This causes the pin to pivot up and down a few thou in the front hole. Not enough to worry about for the stuff I'm doing with it, but would be the only thing I'd do different.
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