I have designed quite a few gearboxes, two of which have been manufactured by our team.
The general rule of thumb is summarized on WCProduct's Website:
Quote:
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Originally Posted by RC
For a single stage gearbox (custom): +.000 - +.001 backlash
For any other gearboxes: +.002 - +.003 is recommended.
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For our gearbox spacing, we used this gearbox calculator which RC made:
http://wcproducts.net/how-to-gears/
Hope this helps!