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Doc's Machine- the Mad Scientist of Paintball
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Spline cutter

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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Information contained in these pages is for reference and entertainment purposes only.  Our methods are not always the best,
quickest, safest, or even the correct ones. It's up to you to know how to use your own machines and tools.
Keep your fingers away from the spinny blades o' death and you should be all right.