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Originally Posted by

**oldtiffie**
A spline is very similar to a spur gear in many respects - as are the calculations.

It will have a pitch circle, addendum, dedendum, tooth depth (includes clearance below the base circle) as well as pressure angle, clearance/back-lash etc.

Depends on the spline.

A common spline has straight sides -- there are no involute curves involved.

If you're talking about an automotive involute spline, they almost always use a stub form, typically 12/24 DP, or 16/32DP. The numerator defines the diametral pitch, and the denominator is the stub pitch. Involute splines are almost always 30° pressure angle.

By the way, involute splines support a lot more torque than a straight-sided spline, because of their self-centering behavior.

**Edit**: DP = (Num Teeth + 2)/OD, so I'm getting 26/1.264 = 20.57 DP, which probably means it's not an involute spline.

Last edited by lazlo; 07-30-2009 at 10:15 AM.

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