Reading another thread on here, it was recommended to use "cutting oil" for drilling steel. I'm sure there is a specific oil made for this use, but is it really necessary, or can just plain motor oil or WD40 be used? I usually dont use anything if the metal is less than
1/8" thick, but the few times I had to drill in thicker metal, I just spray WD40 a couple times a minute, or have squirted some used motor oil from a pump oiler can. Is there any reason to spend money on a special cutting oil? If so, where does a person get it? And what makes it different than plain oil?
Jakester