Conservative. Idaho. Software engineer. Historian. Trying to prevent Idiocracy from becoming a documentary.
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"And we know that all things work together for good to them that love God, to them who are the called according to his purpose." -- Rom. 8:28
I put some oil on the surface to cut, and now I can drill at 1 IPM without any problems. I thought the center drill needed lubrication or cooling, but I can also see aluminum chips ejected to the surface of the oil.
One of the problems with aluminum is it tends to stick to cutting tool surfaces. This can stop the tool from removing metal. With a drill bit, it only has to clog one flute, and it will stop moving through the metal, as the cutting edges can no longer reach the parent metal. Side cutting with a mill bit works a little better in that case, but gets erratic in path, and will vibrate. Small diameter bits will break easier in this situation, due to flexing stress.
One of the problems with aluminum is it tends to stick to cutting tool surfaces. This can stop the tool from removing metal. With a drill bit, it only has to clog one flute, and it will stop moving through the metal, as the cutting edges can no longer reach the parent metal. Side cutting with a mill bit works a little better in that case, but gets erratic in path, and will vibrate. Small diameter bits will break easier in this situation, due to flexing stress.
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