Thread: Gear Spacing Help
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Unread 07-01-2007, 00:15
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Re: Gear Spacing Help
You the "pitch diameter". Like you said, A rough rule is to use the sum of the two PD's and divide by 2. In some cases you need a few thousands of an inch more, but as long as you lube it properly, it willwork just fine with your formula.

Raul

I forgot to mention that you can find PD if you now the "Diametral Pitch" of your gears - DP's come in standard sizes such as 32, 20 or 16. This represents the number of teeth / inch of diameter. So, you can find the PD like this:
PD = Nt / DP (where Nt = number of teeth on a gear).
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Warning: this reply is just an approximation of what I meant to convey - engineers cannot possibly use just written words to express what they are thinking.
Last edited by Raul : 07-01-2007 at 00:21. Reason: Added formula to figure out PD