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Now, here's the trick to a rotary broach:
Using a sine bar, I mounted the shaft of the tool holder at 1° off vertical and
clamped it to a large Vee-block on the magnetic chuck. I then ground the mounting
face all the way across, which gives the spindle portion its angle to the workpiece.

I could have ground the front/spindle portion instead, but doing it this way
gives the rear spindle bearing, which will take the most thrust when in use,
a flat, square face to push against.





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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.