Originally posted by Jellyghost
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Generally speaking, for day-to-day one-off stuff, I use simple, inexpensive motor oil as a cutting oil. I have more exotic stuff, like dark sulfurized cutting oil, Tap Magics, way oils, etc. that I use as needed, but if I'm just tapping a hole in mild steel with a good sharp tap, a dab of motor oil does the job just fine.
I'll also use that, on a rag, to mop a bit of oil on something I don't want to rust, like parallels and sine bars.
There is absolutely nothing wrong with using it on exposed cast iron- like a tablesaw top- to help prevent rust. (Apart from, of course, having to clean it off before use.)
That said, most of my machines get regular use, and thus regular distribution of normal lubes. Between that and a relatively low local humidity, flash rust isn't generally an issue for me.
Doc.
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