I have a friend that has a big wood cutting bandsaw. The mechanism that cranks the guard up and down uses a rack and pinion. Well, the rack is a round shaft that has teeth cut in it, the pinion is a Delrin gear that is stripped out more or less. I'm trying to help him replace it.

So the pinion OD is 1.150", the 'inner diameter' is 0.796". If I guess that splitting the difference gives me an approximate pitch diameter of about 0.973", divide that by the 14 teeth, it gives me approximately a 14 pitch. I havent found an easy way to measure pitch diameter.

I also haven't found a way to determine pressure angle. So I'm making an assumption that it's 14 1/2 degrees.

The face is 0.75" and the overall length is 1.1". The ID bore is 0.422" (this doesn't equate to metric.)

I can't seem to find a 14 pitch 14 tooth gear in any material, much less Delrin. I only have a indexer that will do 24 divisions, and spending $300 on a divider, plus an involute gear cutter seems excessive (though I've done stupider things and ended up with more tools! I have a shaper if I had a divider that could do 14 steps.)

So, long story short, I'm looking for spur gear stock, or a gear that's too long or hole too small that I could machine to size, and in some kind of soft material (nylon, Delrin, brass, etc). This has not been easy. Any gear experts out there?

Thanks for any help.

So the pinion OD is 1.150", the 'inner diameter' is 0.796". If I guess that splitting the difference gives me an approximate pitch diameter of about 0.973", divide that by the 14 teeth, it gives me approximately a 14 pitch. I havent found an easy way to measure pitch diameter.

I also haven't found a way to determine pressure angle. So I'm making an assumption that it's 14 1/2 degrees.

The face is 0.75" and the overall length is 1.1". The ID bore is 0.422" (this doesn't equate to metric.)

I can't seem to find a 14 pitch 14 tooth gear in any material, much less Delrin. I only have a indexer that will do 24 divisions, and spending $300 on a divider, plus an involute gear cutter seems excessive (though I've done stupider things and ended up with more tools! I have a shaper if I had a divider that could do 14 steps.)

So, long story short, I'm looking for spur gear stock, or a gear that's too long or hole too small that I could machine to size, and in some kind of soft material (nylon, Delrin, brass, etc). This has not been easy. Any gear experts out there?

Thanks for any help.

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