Machine Design – II (ME – 308) Lab
Spring 2000 – 2001 (002)
Project # 1: Design of Shaft and Selection of Bearings
Summary for Class # 1
PA = 600 lb
Mass of gear # 3 ( M3 ) = 500 lb
Mass of gear # 4 ( M4 ) = 300 lb
STEP # 1
Calculate the resultant gear force Pc which is acting on gear # 4 by equating the torque on the different locations of the shaft, as the torque on all the locations of the shaft must be equal.
STEP # 2
Calculate the reaction forces on the bearings in the y-axis and the z-axis respectively. Free body diagrams have to be drawn and all the forces have to be resolved in both the y-axis and the z-axis respectively. By performing
S Fy = 0 and S My = 0
S Fz = 0 and S Mz = 0
calculate the reaction forces on the bearings.
STEP # 3
Draw the force diagrams and the moment diagrams in the y-axis and in the z-axis respectively.
Note: On a graph sheet draw the shaft diagram, torque diagram and the resultant moment diagram to scale as shown in the class.