I use broken PCB drills, with just a tiny bit of flute remaining. One single gash at the correct angle, about 5-7 degrees, and a flat just to center works fine.
I end up with a square end ended cut. Not much burring. I often use a 0.3mm bit.
I have a tiny polishing wheel on my dremmel, that is some sort of of soft stuff, that will polish off the burrs without wrecking the copper.
I have just done a 28 pin SMD IC with 0.65mm pitch. That is 0.35mm wide pads, with 0.1mm thick copper. 1/3 cutter diameter depth of cut.
Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.