The double-dwell cam of Problem 10.5 is mated with a roller follower, as shown in Figure 10.90. The vertical offset of the follower is 20mm and the radius of the roller is 10mm. The spring has a stiffness of 1000N/m and is compressed 10mm when it is in contact with the base radius. The follower has a mass of 20g. Plot the driving torque for the cam when its speed is 1000 rpm. What is the power of the motor needed to drive this cam?
Problem 10.5
Design a double-dwell cam with the following properties
• Dwell at 0mm for 90°
• Rise to 20mm over 90° and dwell for 90°
• Fall back to 0mm over 90°
The base radius is 100mm and the rise function is a 3-4-5 polynomial. Plot the radius of curvature for the cam profile. What is the minimum radius of curvature?
Figure 10.90
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