How to model a face cam (or) drum cam? pl's post a step by step tutorial

Try this. Request : Drum cam .
Steps are here.
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Step 1:
1. Draw 150mm dia circle on top plane.
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Step 2:
2. Extrude it to 100mm.
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Step 3:
3. Create a reference plane, tangent to the cylinder surface and parallel to the front plane.
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Step 4:
4. Start a sketch on the new plane. Draw a horizontal construction line with a length of "100Xpi".
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Step 5:
5.Draw the sketch shown, using Lines and Tangent arcs.