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I needed to cut some relatively fine splines in a shaft of 4140 steel, and the
customer had already burned up one HSS cutter in the attempt. I decided to try and make
a cutter that holds carbide inserts- a triangular insert with the tip lightly ground flat was a nearly
perfect match for the spline shape. I started by taking a chunk of 1-1/2" cold-rolled and
turning a basic shape. The flared end is absically just a raised 60-degree triangular point.

See the little arrow? Yep, I've accidentally made "left handed" cutters before.





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