Well that didn't work out well, cutting 6082 aluminium. The settings were. 12000rpm. Feed rate of 325mm per minute. Plunge rate of 254mm per minute, with a depth of cut 1mm. I used a 3.175mm single flute carbide bit, but as soon as the bit cut in to the side of the aluminium the bit broke, so I tried a cut depth 0.5 mm. The bit did cut through the aluminium of 60mm wide but by the time it was at the end there was a poor shaving curl and when I got down to 5.5mm deep it broke that end mill as well. I did use cutting oil and it was a wash with it, also there was no smoke coming from the bit so it was not getting hot. So what do I do now should I reduce the depth of cut a little more or speed up feed rate. Or is it that I am using to small a size end mill?