Universal joints require a small angle to work. If they a aligned and
do not move they will wear in the one spot and fail prematurely. One
to two degrees angle is all that is required. The angle of both
joints needs to be the same. One angle can be "left" and the other
"right" or they can both be "left or right". to prevent vibration.

Dale Davies

It is also important that the pivots of the coupling member (shaft) are on
the same plane, as Paul has shown them on the turbo compound test rig.

Gary Knutson


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