How Bad is it to Drill on a CNC Router?

I had long heard (and myself repeated) that drilling on a CNC router was less than ideal. But just how bad is it to drill materials at 10k RPM? That’s what I wanted to find out for myself.

I’m using Short/Stub Length drill bits from McMaster ( but there’s nothing special about them. Shop around!

PCB drills I’m using:


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