Interesting design a kind of 2 step....I've thought of something like this..
only mine was 2 seperate blades with the short high speed blades
on round extensions past the tips of the shorter broad blades....yours might
work well or not unless it is a copy of a tried and true version....at any rate
it will give you an idea of where to go from there.....all fun.....Good Luck on
your project...
BTW Wouldn't mind having your drill press.
Norm