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When considering building a machine to wave wind coils there are two important aspects. One, you need a heart shaped cam plotted to ensure a linear reciprocal motion. Two, you need a very close ratio retard drive between the spool and the feed arm. The second aspect was the most difficult because I could not obtain gears with the very close ratio required. The problem was overcome by making pulley wheels out of SRBF material. After initial cutting out they were turned using my bench drill and a file. The one on the handle shaft is 34mm dia. and the one on the winding spindle is 34.8mm. The heart shaped cam was plotted using Microsoft Excel but can be done equally well on paper. Below are five close up photos of the mechanism.
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