[LieAfterLie]

Thanks. 12 it is, that's what I got too. Is the pressure angle 12.5 or 20? Does it matter? How do I tell? Would it matter if it's a stub gear? How do I tell? Anything else that would make it incompatible with a normal spur gear?

Could someone tell me some good sites to find aluminum or brass gears? I need 2 12 DP gears with about 36 teeth. McMaster, Grainger and RobotCombat only have steel ones that I could find, wich weigh about 2.5 lbs each with 3" pitch diameters, which is way too much. I don't want to have to drill out a whole lot.