T-Case Spline Counts and cuttn' them

[jpboyjeep]

I've got a bug up my butt to build my own 231/d300 doubler just cuz I think I can do it myself.

Anyways, I've got a question regarding the depth of cut on the splines. So, 60 deg cutter, OK, I've got the outside diameter of the splined area, but is there an actual number to shoot for on the depth besides just fitting it until it works? My D300 splines are kinda rusty on my donor, so I'd rather not cut to fit that, I'd rather cut to a number and clean my splines so they fit right.

Same note, my 231 case is still in the Jeep right now (hooking electric up to the garage this week and next) so getting to it isn't easy, anyone know off hand what the spline count is on the planetary section? And the 1.125 at the end, is that supposed to fit into a 1.126 ID? I just notice most of the vendors have that section ground, which I can do, but any idea on numbers?

Normally I'd just do it until it fit right, but this is a major step in my DIY projects and I'd like to get it right the first time cuz steel isn't cheap!

http://www.omnigear.us/technical_information.htm

Thanks,

Lucas

[jnutter]

Machinerys Handbook has the formulas for involute splines. You need to know the pitch and spline count. The formulas plus a little simple math will tell you everything else.

Can't help you on the T-case stuff...

[jpboyjeep]

The New American Machinist's Handbook....my copy is copyright 1955!

A bunch of numbers and symbols....damn, I actually have to read something!?

Thanks,

Lucas

[Shaggygto]

so what is the pitch for the shaft on a dana 300 and np231? i once heard that it is a standard 27 degree automotive spline. honestly, I had the same idea while back and designed up everything except the shaft to link the two together.

[jpboyjeep]

I don't know what happened to my other post!?

Anyways, Involute Functions are totally nuts.

I will have to pull my t-case out to check the splines etc....I don't know if my math is right.... When I find out, I'll post it up, cuz I haven't found it searching or asking....The inputs are 23 spline, but I don't know the planetary part of it...

Lucas