Cutting Oil Recomendations?

[Soundguy]

I use whatever the hardware store has in the plumbing section that is marked as "Cutting Oil". It's cheap and readily available.

Same here.

Soundguy

 

[Danno1]

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You can't beat A9 if you're drilling or tapping aluminum.

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[travis potter]

try uni-bit for the holes much faster and cleaner you can get a set of 3 at HF for 15.00 or less i think the set goes to 3/4 " for the bigger hole you can get one that will go to 1" at lowes or HD i drill holes all the time with mine. I tap8/32,12/24 and 1/4/20 ever day and use Door-Ease from NAPA it works beter than any taping fluid i have tried, but only the NAPA brand works.

 

[hill]

Rigid Dark or any dark high sulfur content oil is good for general cutting in steel, and I've found the one on the Ace hardware store shelf to be great stuff.
Brownell's "Do-Drill" is their version of 'Tapmatic' specialized for fine threading and/or hole reaming (particularly firearms barrel "holes" i.e. chambers)

 

[3RRL]

I use "Moly Dee" for drilling and tapping pre-hardened tool steels and general dark cutting oil for the rest. I like to use air instead of oils when I can, or a spray mist. It's much cleaner and I'm set up for it. For Aluminum drilling and tapping I use either A-9 or Rapid-Tap. For grinding, sawing and submergeable milling I use soluble oil such as ValCool. For milling aluminum I use kerosene or a spray of WD-40. For grinding aluminum or non ferrous metals I use wax or grease.