上海交通大学：《Design & Manufacturing II and Project》课程教学资源（作业）08 solutions Homework CAM

DESIGN OF MACHINERY SOLUTION MANUAL 8-3-1 PROBLEM 8-3 Statement: Figure P8-2 shows the cam and follower.Using graphical methods,find and sketch the equivalent fourbar linkage for this position of the cam and follower. Solution: See Figure P8-2 and Mathcad file P0803. 1.Draw the cam and follower to scale. Common Normal 2.As described in Section 8.1 and Figure 8-1,find the centers of curvature ofthe cams,which are located on the common normal(axis of transmission).They will be the locations of the moving pivots ofthe effective pin-jointed fourbar linkage. 04 B 3 皮A 2

DESIGN OF MACHINERY SOLUTION MANUAL 8-3-1 PROBLEM 8-3 Statement: Figure P8-2 shows the cam and follower. Using graphical methods, find and sketch the equivalent fourbar linkage for this position of the cam and follower. Solution: See Figure P8-2 and Mathcad file P0803. 1. Draw the cam and follower to scale. Common Normal 2 4 3 2. As described in Section 8.1 and Figure 8-1, find the centers of curvature of the cams, which are located on the common normal (axis of transmission). They will be the locations of the moving pivots of the effective pin-jointed fourbar linkage. 3 A O 2 4 2 B O4

DESIGN OF MACHINERY SOLUTION MANUAL 8-4-1 PROBLEM 8-4 Statement: Figure P8-2 shows the cam and follower.Using graphical methods,find the pressure angle at the position shown. Solution: See Figure P8-2 and Mathcad file P0804. 1.Draw the cam and follower to scale. 4 Common Normal 2.As defined in Section 8.6 and Figure 8-41,the pressure angle is the angle between the direction of motion of the follower and the direction ofthe axis of transmission.Establish those two directions and measure the angle between them. Direction of motion,link 4 Common Normal 4.9 4

DESIGN OF MACHINERY SOLUTION MANUAL 8-4-1 PROBLEM 8-4 Statement: Figure P8-2 shows the cam and follower. Using graphical methods, find the pressure angle at the position shown. Solution: See Figure P8-2 and Mathcad file P0804. 1. Draw the cam and follower to scale. Common Normal 2 4 3 2. As defined in Section 8.6 and Figure 8-41, the pressure angle is the angle between the direction of motion of the follower and the direction of the axis of transmission. Establish those two directions and measure the angle between them. 4.9 2 4 3 Common Normal Direction of motion, link 4