1) A rotary disc cam with central translator roller follower has following motion. Forward stroke of 25 mm in 1200 of cam rotation with SHM motion, Dwell of 600 of cam rotation and return stroke of 25 mm in 1000 of cam rotation with SHM. Remaining dwell to complete the cycle. Mass of the follower is 1 Kg and Cam shaft speed is 500 rpm. The maximum pressure angle during forward stroke and return stroke is limited to 250. The external force during forward stroke is 300 N and that of return stroke is 50 N.

1. Draw Displacement, Velocity and Acceleration time diagram
2. Find prime circle radius, Base circle radius
3. Calculate radius of curvature of pitch curve and Cam profile
4. Determine width of the cam.

(May 2019, 10M)

2) A rotary disc cam and central translator follower has following motion:- Forward stroke = 20 mm in 100o rotation of cam with SHM, dwell to complete the cycle. Return stroke = 20 mm with SHM in 100o of cam rotation remaining dwell to complete. Mass of follower is 1 kg and cam shaft rotates at 500 rpm and maximum pressure angle is 25o during forward stoke. The external force is 310N during forward stroke and 55 N during return stroke.

Determine

1. Base circle radius
2. Design the cam
3. Design the spring
4. Calculate maximum cam shaft torque.

(May 2018, 20M)