I need to make a couple of 3mm holes in this 0.75" 6063-T52 Aluminum Square Bar. I grabbed a 3mm drill bit, and consulted this chart. My drill press only goes up to 3200, so I set it to that and tried to make a hole. The above was the result.
I've never worked with metal before, let alone aluminum, so I'm sure I did something stupid. Did I have the wrong kind of bit? I'm not sure if it was a 135° or 118° bit. I'm extra confused because I had previously managed to make an even smaller hole at an even lower RPM, could I have had it too high?