The Shaft That Failed A single diameter shaft, having no steps or shoulders, drives a machine with a fairly heavy load. The shaft rotates at 1200 rpm and extends from the bearing several times its diameter. A vee-pulley is mounted on the shaft. Belts drive the pulley from a motor, causing a considerable side stress. The bearing is kept in place with a snap ring that is in a narrow groove around the shaft at the edge of the bearing. The shaft has to be replaced several times a year at considerable cost in lost man hours and material. Every time the shaft is severed, the millwright notices that it is at the location of the snap-ring groove. The break has a rough crystalline surface. Can you identify the problem and name the type of failure? Name as many changes that could be made to correct the problem.
The Shaft That Failed
A single diameter shaft, having no steps or shoulders, drives a machine with a fairly heavy load. The shaft rotates at 1200 rpm and extends from the bearing several times its diameter. A vee-pulley is mounted on the shaft. Belts drive the pulley from a motor, causing a considerable side stress. The bearing is kept in place with a snap ring that is in a narrow groove around the shaft at the edge of the bearing. The shaft has to be replaced several times a year at considerable cost in lost man hours and material. Every time the shaft is severed, the millwright notices that it is at the location of the snap-ring groove. The break has a rough crystalline surface. Can you identify the problem and name the type of failure? Name as many changes that could be made to correct the problem.
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