Talk:Non-circular gear

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Does anyone else think intermeshing twin screw extruders deserve a mention in this article? Twin screws are responsible for a enormous amount of the materials made in the world and could not work without the fundamental principles of a non-circular gear.

Granted twin screw extruders gears/elements do not transmit torque directly to each other, but they do transmit torque to a material and to each other through this material. — Preceding unsigned comment added by Ben5309 (talk • contribs) 01:33, 31 August 2012 (UTC)

Layman's explanation of the constraints of NCGs?
The math there is useful in answering this, I'm sure, but for most of us, what are the geometric constraints of NCGs? For example would the pointed bottom of a heart shape prevent its use in a fixed-axle gear set?