So I have a Tormach 440 with Power Draw Bar. I have been teaching my self how to use the machine and have been finding recipes that seem to work. One that I have been using for drilling #37-39 holes in aluminum was 6 IPM at 10000 RPM. This was cutting through like butter up until today where I broke 3 bits. I have not changed anything that I know of and the drilling operation is pretty similar. Anyone know some common things that could cause this sudden change?
Thank you in advance