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Study of worm-worm drive 3

Input: blue crank to which is fixed a small worm (1 start, lead: t1, pitch diameter: D1).

Output: large worm, 2 starts, lead: t2 = 2.t1, pitch diameter: D2 = 2.D1 The output moves t2 in 1 rev. of the input.

The small worm can be replaced with a cylinder of circular grooves or with a rack.

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