Library › Mechanisms › Pulleys of the first system, 2 movable pulleys

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.

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From the full sheet

Pulleys of the first system, 2 movable pulleys (4 : 1): every size, notes, mating features and sources. How does each movable pulley double the advantage?