Router Bits are Not Drill Bits
/Routers spin bits too fast to use them for drilling holes. They are just going to overheat and burn. A smaller bit in a pocket toolpath can make the hole needed with better chip clearance and far less friction heating. And this allows for a range of hole sizes all made with one bit rather than changing tools.
This is part of a series of videos with progrmaming tips to get the most from your CNC bits. You can find much more like this in my Beginner’s Guide to CNC Machining in Wood from Fox Chapel Publishing.