Library › Mechanisms › Two single blocks rove to advantage

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, Xem Studio Design License — Xem Studio

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From the full sheet

Two single blocks rove to advantage (3 : 1): every size, notes, mating features and sources. Why does it matter which block the hauling part leaves?