Spline-Holes are machined by
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In the broaching process, a long tapered tool called the broach is passed across the stationary workpiece. There are a number of teeth on the broach, each of successively greater height. Linear cutting speed is provided to the broach.
Broaching is classified into internal broaching for machining holes (finishing the hole or making splines and internal gears) and external (surface) broaching for machining an external surface. The broach may be pushed or pulled over the job. The pull-type is more common as it places the broach in tension and avoids buckling of the broach.
Broaching is used when precision machining is required, especially for odd shapes. Commonly machined surfaces include circular and non-circular holes, splines, keyways, and flat surfaces.