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 Author: b1ueshift Time: 01/14/04 14:16 PST This is a reply to message no. 13004 by dfischer Reply | Original Message | New Topic | List Topics | List Messages on This Topic
 Current Topic:Gearing formulas I can tell you the answer to number 2, because it's the easiest. Pitch Diameter equals 9.55" Method:  Pitch of worm gear (ie distance between threads on worm) = 3/4" For a single thread worm gear, for each rotation of the worm, the driven gear will move one thread pitch at the pitch diameter (ie pitch circle of the gear will move 3/4"). As the speed ratio of the gears is 40:1, this represents 1/40 of a full rotation of the gear so pitch circle circumference is 40 *3/4" = 30" To get the pitch diameter from pitch circumference, divide by pi. 30/3.1416 = 9.55"