Internal broach for cutting splines as following.
Involute Spline
Broach splines where the sides of the equally-spaced grooves are involute.
Parallel Key Spline
Broach splines where the sides of the equally-spaced grooves are parallel in both directions, radial and axial.
Crowned Spline
Broach crowned where the sides of the equally-spaced grooves are usually involute, but the male teeth are modified to allow for misalignment.
Serrations Spline
Broach splines where the sides of the equally-spaced grooves form a "V". These are usually used on small-diameter shafts.
Ball Spline
Broach splines where the teeth of the outer part are implemented with a ball bearing to allow for free linear motion even under high torque.
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