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Originally Posted by Andy Baker
For you drivetrain gearbox designers, hear is a question for you: what is your preferred gear pitch?
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Just one preferred pitch? With these 3-motor monstrosities I design, and the fact that we (at 188) never figured out exactly how to replace the gears (nor really tried), gears of all types find their way into my designs.
Older Woburn gearboxes used mostly 20 pitch, 14.5° pressure angle gears from Boston, because they were easily available, machinable, reasonably durable, pretty cheap, and featured in the Small Parts catalogue (back in the day...).
And the current Woburn design still uses 4 of them. But I was introduced to SDP/SI's line of hardened steel gears last year--and they're pretty neat too (hard to machine without an EDM, though). If cost were no object, I'd like to make greater use of them. I used the 24 pitch, 20° pressure angle ones, but they also come in 32 pitch, if my memory serves me correctly.
I don't like metric gears, because PIC Design sells them....
Edit: To clarify, last year's Woburn gearboxes contained 0.7 M/20° PA, 32 P/20° PA, 24 P/20° PA and 20 P/14.5° PA gears.