Shaft deflection should be considered when choosing the proper bearing and shaft diameter for end-supported systems. Deflection is directly related to the diameter of the shaft, the unsupported length of the shaft, and the type of shaft end mounting that is used.
"Simple" - the end allows some of the shaft deflection slope through the fastening point.
"Fixed& - the ends are constrained from deflection.
NOTE: Fixed end mounting can be accomplished by capturing the shaft end with a length of engagement equal to or greater than 11â„2 times the shaft diameter.D = N x W x L3
- N = value from the chart below
- W = load in pounds
- L = length (in inches) of unsupported shaft section
|"N" VALUE FOR NOOK SHAFTS|
|Shaft Diameter (in.)||Simple||Fixed|
|1/4||3620 x 10-9||905 x 10-9|
|3/8||715 x 10-9||179 x 10-9|
|1/2||226 x 10-9||56.6 x 10-9|
|3/4||44.7 x 10-9||11.2 x 10-9|
|1||14.1 x 10-9||3.54 x 10-9|
|1 - 1/2||2.79 x 10-9||.698 x 10-9|
|2||0.866 x 10-9||.0220 x 10-9|
|3||0.168 x 10-9||.432 x 10-10|
|4||0.052 x 10-9||.136 x 10-10|