Details

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Floating Shaft/Selections
Introduction — Floating shaft diameters have been preselected to transmit the coupling 
torque and need only to be checked for allowable speed.
Construction — Standard shafts are solid, AISI 1018 or 1020 cold rolled steel. Also 
available is an optional solid, AISI 1018, fully turned, hot-rolled steel shaft.

Determine the Allowable Shaft Length

1. Select the coupling size per page 6 and 25.
2. From page 25, determine shaft diameter (Dimension SD) for the coupling selected.
3. From the Table 12, locate the floating shaft diameter (Dimension SD) determined in Step B.
4. Determine the allowable shaft length for the required operating speed.
   For speeds under 540 rpm — Read the maximum allowable shaft length to the left of the required shaft diameter.
   For speeds over 540 rpm — Trace right from the shaft diameter determined along the diagonal line to the point of intersection with the required vertical operating speed line. Trace right along the horizontal line to the right and read the maximum allowable shaft length.
5. Determine if shaft requires balancing. Locate point where operating speed and floating shaft length cross. Balance is required when point is located to the right of bold line.
6. If a longer shaft is required, reduce the operating speed if practical, or select the next larger size coupling.