A Geneva Mechanism (otherwise known as Maltese Cross) is used to turn continuous rotary motion to intermittent motion. It looks like this:

Member A rotates continuously, while B rotates 90 degrees at a time.

We’d like to compute the maximum torque required, assuming b has moent of inertia I.

Setting I and ω to 1, we can graph this:

To find the maximum’s location, we can differentiate:

`>simplify(diff(u,theta));`

Solving (numerically) for θ gives:

`>solve(du=0,theta);`

We can set the numeric value of θ in the variable panel, and look at the numeric reaction torque to get our maximal value (or we could have read off the graph above).

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