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Originally Posted by Cory
... I think he means if you only have a choice between brass or plastic. Often small gears with a small face witdth only come in brass or plastic...
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actually, PIC gears go to as small as a 1.58 mm face, with an OD of 6.5 mm (not that i'd personally use anything that finely pitched on my drivetrains)
also, depending on the type of brass/acetal used, the plastic could end up being stronger (i'm not sure which type of brass is used in gear making).
on an unrelated note, i found a pretty good site for looking up this sort of stuff:
matweb