Our frequent contributor Mark Grizotsky writes with additional information on the subject of straight-sided spline shafts.

“When we find a trapezoidal profile or form for the angle of the tooth of a roughing hob, we have a more simple and technological way of producing these hobs. Instead of grinding after heat-treating the curves on the tooth, we grind a simple trapezoidal profile. It gives us an advantage, and a profit.

“But, after some research of the milling splines we understood that the angle of the teeth of a hob can be changed and give us different curves of grinding allowance on the splines depending upon elements.

“These elements are included in this formula:

Formula MLG-2 (empirical)

A = G/N (cos 3.14159/Z)

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