An analysis of a machine failure can be useful in determining what is and isn't the cause. With so many variables, it's helpful to eliminate some, as shown in this case history.
The input shaft to a gearbox driving an 11,000-hp extruder cracked partially through (Fig. 1). Since there was heavy wear at R, the moment due to misalignment and the friction at these spline teeth were analyzed (Fig. 2).
Fig. 1
Cracked input shaft.
Fig. 2
Coup
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