3D model of spline - what tooth thickness?

[R1chJC]

I'm creating a 3D model of an external involute spline in SolidWorks.

The model is to be used directly for manufacturing programming, as such the model needs to reflect as best possible the required geometry at mid tolerance.

I've created the involute flanks with parametric equation curves and produced the minor/major diameters etc.

However, I'm struggling to decide what the tooth thickness should be. The manufacturer would like the teeth at mid-tolerance. Does this mean I should model mid-effective or mid-actual tooth thickness, or something else? Not sure how I accommodate for process variation either. See attached.

Spline standard is Flat Root, Major Diamaeter Fit ANSI B92.1 1996.

Any help would be appreciated.

 

[spigor]

From what you write I'd say you should use the mid actual tolerance.

 

[mfgenggear]

To what Spigor said.

Max effective = no
Between max actual and min actual

 

[R1chJC]

Thanks for the replies.

mfgenggear, apologizes I'm not sure what you mean?

 

[mfgenggear]

R1chJc

to under stand the American versions of splines must read and under stand the Specification.
Max effective is the Go Gage size of the ring gage. The min actual would be the the no go gage size.
so cut your spline between the Max actual & the Min. Actual.
The manufacture must under stand to allow for over burn . from the wire or conventional EDM.
other wise it will be cut under sized.