SAE Joint Selection Graph

Graph F

graph_f

CRITICAL SPEEDS

All cardan shafts have a critical speed at which they become rotationally unstable.
Therefore the following calculations have to be applied to ensure safe operation of the system.

sae-joint-selection-graph-math-grey

The max safe operating speed should include a safety factor as below.

AUTOMOTIVE APPLICATIONS

Max safe R.P.M. = η MAX x 0.7

INDUSTRIAL APPLICATIONS

Max safe R.P.M. = η MAX x 0.65

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