Here's the description and a detailed drawing:
A Simple, Compact Rotary Broach | The Hobby-Machinist
A question about the choice of some dimensions, you have a relative short length to support the broach, on a too high speed accidently, it makes some vibrations and a less good interior finish with waves, when I made one time ago without your measures, with a longer distance between the ball and the set screws, it have a more stable use than the one made shorter now.
What rpm speed do you use please ?
It's really not to criticize your construction, just an observation in workshop use.
Have a niice day.
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