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Old 21st February 2012, 02:12 PM   #1
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Default Cutting Fluid - What do you use?

I think we can all agree that cutting fluids are a necessary tool in a DIYer's arsenal, making the boring metalworking/machining stuff so much easier...

People have been using from WD40 to purpose-made products like Tap Magic and alternative ones like coconut oil, but what's your favorite?
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Old 21st February 2012, 02:16 PM   #2
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What are you cutting?
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Old 21st February 2012, 02:20 PM   #3
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Mostly aluminium.
My favorite so far is coconut oil (an idea I got from a friend) which is easy to get, cheap and beats stuff like WD40. Haven't tried specialty products like Tap Magic though.
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Old 21st February 2012, 02:22 PM   #4
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For aluminum we use either plain water or the milky oil-water mix.
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Old 21st February 2012, 02:31 PM   #5
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Originally Posted by Cal Weldon View Post
...the milky oil-water mix.
Hmm, yeah, I can get that sort of stuff locally and it's not expensive either.

By the way, before going for the coconut oil idea I had a look around and was surprised to see that it's use as cutting fluid is documented in the literature (e.g. here). Other people suggest groundnut oil or even sunflower oil based products.
I'm not sure about the long term effects such residue can have on the metal, though.
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Old 21st February 2012, 03:28 PM   #6
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I use WD40. And once used IPA (which seemed to work fine) when I didn't want any oily residue on the workpiece.
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Old 21st February 2012, 03:39 PM   #7
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IPA
You used beer?
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Old 21st February 2012, 04:15 PM   #8
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WD40. It's cheap and comes in handy can with straw nozzle.
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Old 21st February 2012, 04:15 PM   #9
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for aluminium I was thaught to use spiritus. Of cause there may be a safety issue...
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Old 21st February 2012, 05:13 PM   #10
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first cutting lubricant I ever used was regular soap.
when manually tapping threads I use plain 10W40 motor oil. it does an incredible job.
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