I use kerosene for aluminum tapping, turning, milling (talking HSS, not inserts) per old timey recommendations. I do use WD-40 sometimes, if handy, and my kero can out of reach or buried somewhere. But basically they do the same thing to lubrcate and prevent chip welding, etc., one at about a tenth the cost of the other.
ps. kero also is the weapon of choice around here for rust breaking, and dissolving, including freeing stuck tractor engine pistons.
pps. besides the fact that cast iron may be a problem with coolant systems, the plus side of why it's cut dry is that it contains free graphite, a lubricant, and it doesn't gall like chewey metals.
ps. kero also is the weapon of choice around here for rust breaking, and dissolving, including freeing stuck tractor engine pistons.
pps. besides the fact that cast iron may be a problem with coolant systems, the plus side of why it's cut dry is that it contains free graphite, a lubricant, and it doesn't gall like chewey metals.