![]() ![]() Would two ellipses rotate together in contact with fixed centers? If not, what curves would do so? Ovals? The question is complicated by the fact that the poing of contact between two such curves may not necessairly be on the line between their centers at all points in the rotation. I am not even sure that the shape of the pitch line is even an ellipse. Probably even the two flanks of a single tooth (or space) are different. What I wonder is how are such gears cut? I would think that each tooth is a different shape from the ones next to it. I saw an ad in the latest HSM with a drawing of such a pair of gears and it brought back the fascination. The driver was turning at a constant speed and the driven gear would cycle from faster to slower twice each revolution. They were the same tooth count and were meshed with the high spots on one matched to the low spots on the other. The pair that I was most fascinated by was two that were cut on blanks that were probably elipses instead of circles. They were all meshed together and a motor drove the exhibit to demonstrate the actions of the various types. It contained almost every type of gear from simple spurs on up. ![]() ![]() Years ago I observed an exhibit in a showcase that was placed in the main lobby of the New Orleans International Airport by a local shop that made gears. ![]()
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