Construction of radial plate cam to give simple harmonic motion to a knife edge follower |
| Step one: | Draw two circles with the following radii: the minimum cam radius and the maximum follower displacement. |
| Step two: | Divide these circles in 30° divisions. |
| Step three: | Construct the displacement diagram as shown. Note the displacement diagram is aligned with the intersection between the minimum cam radius circle and the 0° division. This represents the line of intersection between the knife edge follower and the cam profile. |
| Step four: | Index the 30° divisions. |
| Step five: | From the displacement diagram project the displacement of the follower at 30° to intersect the 30° division. Then from the displacement diagram project the displacement of the follower at 60° to intersect the 60° division. |
| Step six: | Project all the other displacements from the displacement diagram onto the corresponding divisions. |
| Step seven: | Join all the intersections to complete the cam profile. |