Cycloidal Gears
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A cycloidal gear can be drawn as an alternating sequence of hypocycloid and epicycloid arcs. This Demonstration shows the generating circles rolling along the pitch circle while generating the gear profile.
Contributed by: Erik Mahieu (March 2013)
Open content licensed under CC BY-NC-SA
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"Cycloidal Gears"
http://demonstrations.wolfram.com/CycloidalGears/
Wolfram Demonstrations Project
Published: March 21 2013