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my question what what benefits does this have vs not broaching?
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If you want the raceways you need to cut them.
They are cut by broaching since there is not actually any other practical way to cut long grooves on the inside of a cylinder the length of the cylinder.
you might be able to figure out a way to EDM them, but that s likely to be just as hard to do on a hobby budget as broaching.
And the 'cut and advance' method described earlier is what a shaper does.
They are rarely used outside of small hobby use.
A cut rifling machine is similar in concept.