Drilling a square hole

Ok so I have too much time on my hands :LOL::LOL:

Educated Earth // Videos - Tech & Gadgets - Machine Drills Square Holes in Metal

yep the quill is moving to make that hole square hole :)

That thing is fun to watch in slo-mo! Not something you're going to run in your drill press or old milling machine - the rpm has to be dead on for the designed quill movement, seems to me.

yep it a speed= timming thing .i would think there would be a way to phase the cutter end mill .the cutter running off set and cutting rake is off center of quill at just in itself is not making the hole square