SOLID MECHANICS TUTORIAL – GEAR SYSTEMS
direction of rotation. It has no affect on the gear ratio. The teeth on the gears must all be the same size so if gear A advances one tooth, so does B and C. t = number of teeth on the gear. D = Pitch circle diameter. m = modem = D/t and this must be the same for all gears otherwise they would not mesh. m = DA/tA = DB/tB = DC/tC DA = m tA DB ...
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