.....

There is also the advantage to the built up e-shaft.
It will allow for the
installation of a stationary gear on both sides of
the rotor.

Thank again

Kenneth McKenzie

Kenneth
Did a little more study of splines and find that 24
pitch is standard. That dictates a shaft diameter of
1.125 with 27 teeth or 1.25 with 30 teeth. Do you
think it feasible to shape internal splines in lobes
using EDM to minimize distortion and stress? Also did
a quick calc of torsion and find a 1" shaft with
active length of 8" will windup about 1 deg under
500#' torque. Don't know what's acceptable or if I
analyzed correctly. What do you think.
regards, Robert

Kenneth,
The section modulus of a solid shaft is .196 * D^3
For 1" dia = .196 in ^3
Torque of 500 ft lbs is 500 *12 = 6000 in lbs.
Stress is torque over section modulus = 6000 / .196 = 30,600 psi.
That is about 4 times too high. Usually for line shafting 8000 psi
maximum is recommended.
You need at least a 1.5 " diameter shaft to carry 500 ftlbs of torque.
If it splined you should calculate the root diameter of the spline.
1 5/8 dia shaft should be used as a minimum.
If the shaft becomes too long an intermediate bearing is necessary, but
6 '' would be ok for a 1 5/8 shaft.

Besides DP 24 there are also DP 32, 48 or 16, even DP 20 might be
available.

Rolf



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