I would observe that I think second guessing is a healthy part of any well controlled process and the goal of this framework is certainly not to restrict second guessing, rather itâs to improve judgment quality and thereby the acceptability and credibility of the judgment with those charged with second guessing them.
They can be flat root, fillet root, or major diameter fit. The purpose of this type of spline is to allow for angular misalignment between the shaft and mating detail. This is accomplished by crowning the male tooth. The tooth (usually) has a symmetrical crown about the centerline of the spline face-width.
The fillet root side fit spline exhibits a full radius in the trochoid area between the teeth on both members. This full radius is tangent to the involute sides of adjacent teeth, providing maximum strength. The major diameter fit spline has a tightly controlled outside diameter (male) and major diameter (female).