I am looking for a female spline that will fit
  the output shaft on the TC gear box.
  It is 25 mm OD with 18 splines.

  It is about the same OD as Tracy's spline plate but
  far fewer splines.

  Anybody know their splines ? :)

  Paul Lamar

Paul,  I would call Hayes  Mfg Co at  231-879-3372  and ask for a code
99 (special spline or bore)  jaw type steel  shaft coupling sized for
 about
40 HP. A Hytrel insert and the metal ring external retainer. You will also
need the bore and key measurements for the E-shaft nose.
george grimes

The screw in the end of the e-shaft is high torque. I'll weld
a socket on the end of the coupling shaft and connect it that way.

The spline was a press fit so I am sure it is a custom
spline.

I have decided to use the gear as part of the coupling.

I want to get that gear normalized tomorrow and turn it down.
If I get it up 1650 F or so and let it cool slowly will that do it?
I have a small electric oven. Less than a cubic foot. What
is the best way to let it cool. Can I just turn off the oven?
Will that cool slowly enough?

Max torque will be about 50 foot pounds at 6000 RPM
What kind of mcmaster carr coupling do you recommend?


A "Multi-Flex Shaft Couplings" looks good.
6,000 RPM but only 450 inch pounds.


Paul Lamar

 On second thought I'll  never get the TC gear box and 3 rotor engine
 aligned well enough to use a simple coupling. Plus they will
 move around slightly while running.

 I am going with a double u joint shaft like this.


 Paul Lamar


 Paul air cooling is too fast. You might put it in a box of granulated
 garden lime for a day after you get it hot.
george

Now you tell me. I just paid $50 to the heat treater :)

I have decide to use AN24 SS braided hose as a coupling.
Held on with shaft collars.

Much cheaper than all the other options I have looked at.


Paul Lamar