1. Follower Positions

In this example, Fig. 86, a flat-faced follower is carried by an oscillating arm similar to the roll in Fig. 83. The length of travel 06 is divided into six equal parts, as in the previous cases, the positions of the follower being indicated by the radial lines C'1, C'2, C'3, etc.

2. Cam Radii

The original radius CO is drawn through the assumed point of contact, and perpendicular to the face of the follower in its original position. [The radii CX and CB are then drawn limiting the arcs of rise, rest, and fall, and the subdivisions of the arcs of rise and fall properly made.

3. Follwer Rotation

The intersections R1, R2, R3, etc., of the rotating arcs are found as in the previous cases. The rotation of the follower is accomplished by drawing through the points R1, R2,R3, etc., straight lines making the same angle with these radii as the follower in its corresponding positions makes with the original radius CO. For example, the angle a1 is equal to a; the angle b1 is equal to b; and the angle c2 is equal to c.

4. Tangent Line

The tangent line is now drawn to the several positions of the rotated follower, and the arc of rest is struck, thus giving the outline of the cam.

5. Testing

The cam should be tested by the tracing-cloth method.

6. Pressure Line

The pressure lines are drawn the same as in Fig. 85, and it is suggested that the rotation of them back to the positions of the follower in its path be accomplished by the tracing-cloth method, as in Fig. 83.

Diagram of Cam with Flat Follower on Oscillating Arm.

Fig. 86. Diagram of Cam with Flat Follower on Oscillating Arm.