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