I had a project to do with G-10 1/2 in. thick and I started with 3/8 carbide and the stuff just laughed at that tool and destroyed it with in 3 in. of travel. I tried 1/4 and 3/16 but got same results. I had to go to a diamond coated bit Onsrud #67-254 @ $110.00. It's a 1/4 in. 3 flute downshear with diamonds all over it with some room for chip removal. It works great @4,000 RPM @ 20 ipm without coolant. My Router does not use coolant so you might be able to run it faster. My concern was heat and it do get hot. So you might have better luck there. As far as drilling I used HSS drills and compressed air to cool the drill bit. It produces a nasty powder that you won't want to breath so coolant will help there too keeping the dust down but it might contaminate your coolant and be undesireable. You can decide there. But that bit is GREAT for doing the cutting.