GearHeads Corner

Making and outputting an internal spline is what I needed as well.

They can be made. There is a post which shows the formula for a standard spline, it is just a ring gear with a stubbed
profile. Ill see if I can find it..


Art

Hi:

For the life of me I cant find the post for the making of a spline.

But heres generally how it goes. A Spline is specified as a
20/40 spline for example. This means its a DP20 toothing with a
depth of a 40DP gear. To get the profile you set up for a DP20
gear and select a profile shift of 0.5, and a pressure angle of 30
for most splines. This profile should match a 20/40 spline, its the
same type of calculation for a 16/32 etc..

  Ill see if I can find the original thread, it had more information I think...

Art

Several months ago I needed to make an internal spline to mate with the spline on the output shaft of an RC servo.
I was able to find info on this particular servo spline that gave me the root diameter so I was able to get some idea as to tooth depth.
From there I ground a HS lathe bit into a profile that fit into the spline OK, the teeth were more triangular than gear tooth shaped
and using a fly cutter and dividing head I cut the spline into a piece of steel. I used this as a broach to cut the internal spline into
some aluminum, was a blind hole so had to make sure the blank hole was deep enough to take up the swarf from broaching.
It all worked OK and for the second time doing this I made some fixturing to hold everything in line while using the arbor press to push home the broach.
Since then I have bought some oil hardening tool steel so the next broach I make I can easily harden.
Any who that's my spline story.
73's
Bruce