The worm shaft shown in part a of the figure transmits 1.2 hp at 500 rev/min. A static force analysis gave the results shown in part b of the figure. Bearing A is to be an angular-contact ball bearing mounted to take the 555-lbf thrust load. The bearing at B is to take only the radial load, so a straight roller bearing will be employed. Use an application factor of 1.2, a desired life of 30 kh, and a reliability goal, combined, of 0.99.

Specify eachbearing.

Transcribed Image Text:

Worm pitch cylinder Gear pitch cylinder 36 67 212 36 72 555 T 145