What's evryone's favorites for steels... just an all around fluid? I've got tap magic or some such nonsense, and the stuff stinks like hell, especially if it gets too hot. Do C. Fluids have differing smoking temps?
That depends on what kind of operation you're doing on steel. When heat buildup is a big problem, it needs to reduced by using something to flood it with, like your typical water/concentrate mix (valcool, water-soluable, ect.) Other operations involving high cutting pressures like tapping and reaming, lubrication is more important..... Coolants usually don't lubricate well, and lubricants usually don't cool well.
Everthing from lard oil,Thread oil, Castrol moly D, to The 111 stuff can be mixed with Bees Wax to an applieable paste.
Bees Wax will go toward heat and carry cutting compounds to the cut.
Cutting with flood coolant is the by far the best but really messy.
We ran a test on a repeat job using pure lard oil and a name brand cutting oil. We got 25 percent better production with the cutting oil. Tools and drills lasted longer. But in a home shop I don't think you would notice any difference.
Jims, I would love to see more reports of this sort of test. Do any of the machining magazines do this kind of testing?
Because it is the easiest for me to get, I use pipe-cutting oil -- I can buy it cheaply, in 1 qt or 1 gallon or larger quantities, from my local old-fashioned hardware store. I don't mind the smell, but my wife does!