This is a elliptical trammel made by my friend Hardik, Yagnik, Parth, Sagar and me. For the first time we designed and manufactured by our own. The elliptical trammel or ELLIPTOGRAPH is a device which is used to draw ellipse shape having its major and minor axis. Ellipse is type of engineering curve which is used in different engineering structure such as the shape of the end of the front axle has elliptical shape, because it can withstand axial force without buckle.
Elliptical trammel is an inversion of double slider crank chain mechanism. There are 2 slider link which slides in the slots as shown in the figure. There is a link called crank which is connected to both the sliders.
The length between the 2 slider and end slider to pencil is adjustable. The linear distance between upper slider and pencil is half major axis where as the linear distance between lower slider and pencil is half minor axis...
