Library › Mechanisms › Shaft carried on the rims of two pairs of wheels

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

Shaft carried on the rims of two pairs of wheels (anti-friction bearing): every size, notes, mating features and sources. What is a friction-wheel bearing?