Cutting oil vs Old motor oil and non-detergent oil

I have very limited exposure to lubricants, but here is what my experience is in words. For anything that will be exposed to ultra high vacuum or food grade, use non sulfur based oils. For thread forming, tapmatic or moly D. For most all other, water mulsified vegetable oil type coolants if I understand the jargon which I heard is correct.


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An interesting thread.

My 42 year old restored Honda requires Non Detergent Oil specifically for WET CLUTCHES.
It has a Centrifugal Oil Filter which (commonly called a SLINGER), the oil is SPUN and the solids accumulate on the surface of the spinning drum.
It works quite well - every time I change the oil there is always a gooey film of debris on the spinning drum inner surface.

Now back to where this thread was going, I think I might just save some of the old oil the next time I change it a see how it works.
It only hold 2 qts so I can store in in an old 1/2 gal. milk bottle.
 
I use clear cutting oil for steel, not because it is the best, but because it is adequate, fairly inexpensive, doesn't stink, and cleans up very easily when I am done. WD or kerosene for AL
 
I've taken to using rubbing alcohol on aluminum, it (is claimed to) adheres to the cutting edge keeping the aluminum from sticking. I have it in a plastic squeeze bottle which I've fitted with a brass tip, with a 1/32 hole in it. I use just enough, no flooding. I use it for drilling, tapping, cutting off, turning. whenever I'm machining aluminum.
 
Must be the glycerin in the mixture that is giving the lube.
Pierre
 
For Aluminum I have used WD-40, kerosene or unscented lamp oil, which behaves just like Kerosene but no smell, price about the same. For threading I like Tap Magic, especially the old stuff with TCE in it, but the new formula works okay. In my mist set up for milling I use Rust Lick with good success. Lathe work I usually cut steel dry with carbide or a little oil with brush, either Key Cut or Mobil Sulphur cutting oil or lard Oil.
 
Cutting fluids and lubricating fluids are two totally different animals. One is to get under the metal and help it cut, the other is to keep the metals sliding on each other with a film of oil keeping them separated. Using lube oil for cutting is like using gasoline to put out a fire. Use cutting fluids for cutting, or cut dry.
 
I have used old motor oil before but have not been able to tell that it cut better, in fact dark threading oil seems to cut better. I have noticed when using old motor oil it smokes quicker and my lungs hurt at the end of the day so I dont use it anymore.
 
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