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Originally Posted by Smrtman5
Im a fan of Cool Tool II, its not water based so it doesnt rust the machines if not cleaned up right away. It does have an odd odor- it smells kinda like chicken to me, but its not dangerous. Ive known old school machinists to recomend kerosene for aluminum, never having tried it, i wouldnt know- but acetone works for tapping. Im not a fan of the oils for tapping Al because the chips just get stuck to the tap and i get stuck with a sticky dirty mess. I usually machine Al dry anyway unless im making a large hogging cut or drilling an excessivly large hole. If youre making the Al extrememly hot, youre probably feeding too fast- thats my theory.
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While thats genrally true, especially for manual milling, CNC milling with streaming coolant, the coolant does more than cool the tool and the workpiece, and flush chips. Chemical reactions occur under the pressure and heat at the cutting edge, that help preserve the tool edge and many other things.
http://www.blaser.com/download/Publication_Sept02.pdf is a good read on the subject. So using the coolant/lubricant can let you go faster not juts because the cooling properties, but because of other things also.
Its not just a case of if something is slippery it makes a good cutting fluid.