Library › Mechanisms › Internal gear and pinion, 60 : 20

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")

Dimensions

parameter	pinion
value	20 T

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From the full sheet

Internal gear and pinion, 60 : 20 (3 : 1, same direction): every size, notes, mating features and sources. Why does an internal gear turn the same way as its pinion?