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# Elliptical trammel

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### Elliptical trammel

1. 1. Introduction The Elliptical Trammel (also known as the Elliptic Trammel, or the Trammel of Archimedes) is a simple mechanism which can trace an exact elliptical path. It consists of two shuttles which are confined (trammelled) to perpendicular channels or rails, and a rod which is attached to the shuttles by pivots at fixed positions along the rod.
2. 2. Introduction As the shuttles move back and forth, each along its channel, the end of the rod moves in an elliptical path. The semi-axes a and b of the ellipse are the distances between the end of the rod and the two pivots. An ellipsograph is a trammel of Archimedes intended to draw, cut, or machine ellipses, e.g. in wood or other sheet materials. Usually the distances a and b are adjustable, so that the size and shape of the ellipse can be varied.
3. 3. Inversion Elliptical Trammel is an inversion of double crank chain mechanism. A double slider crank chain consists of four links forming two sliding pairs and two turning pairs. Link 1 Frame Link 2 Slider –I Link 3 Coupler Link 4 Slider - II