Library › Mechanisms › Spur gear pair, module 1, 20 : 40 teeth

Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

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From the full sheet

Spur gear pair, module 1, 20 : 40 teeth (2 : 1): every size, notes, mating features and sources. How do two spur gears change speed and direction?