So you want to put a square peg in a round hole

[TSOTSI]

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[Bailey Guns]

Did that thing just drill a square hole? That is cool!

[baglock1]

Ahh, the good ol' Reuleaux triangle. I made the comment of drilling square holes a few years ago to one of my college professors at the time. He scoffed at me until I showed him the geometry.

Those bits are pretty cool. I've used them in CNC lathes before. The first time you use one, they blow your mind.

[TSOTSI]

All previous cutters I had seen using this principle left a radius in the corners, but this one seems to cut the corners at right angles, or is that an optical illusion from the camera?

[BPTactical]

Very slight radius.
CNC is amazing critters.