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Old 21st February 2012, 07:09 PM   #11
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Using Tap Magic I have gotten more than 25,000 holes out of a standard 10-32 tap.

The old books I have suggest lard mixed with kerosine. Tap Magic works much better.

The white water/lube mixture also acts as a coolant to extend bit life at higher cutting speeds. You can get more work done in an hour at the higher speeds but you get fewer pieces per bit.

But whatever works for you should be fine.
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Old 21st February 2012, 09:02 PM   #12
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Turpentine - the real stuff, made from pine sap, not the synthetic imitations - is hard to beat for thread cutting taps and dies. I can still get it at genuine hardware stores (a breed on the edge of extinction) as well as the national "home center" chains, without going to a specialty machine shop supplier.

Ever since an old machinist showed this technique to me decades ago, I have wondered why it works. The best theory I have is that the low viscosity, low surface tension turpentine can get right to the very point of cutting contact, where the heat of deformation vaporizes it and leaves behind a microscopic trace of pine resin. No way to test that theory, but if it's true there are probably other combinations of slick solid materials and suitable solvents that could give the same effect.

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Old 21st February 2012, 11:39 PM   #13
tvrgeek is offline tvrgeek  United States
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The can says "cutting oil." WD 40 is just what the name says "Water Displacement". It is not a lubricant. I also have used soapy water or anything at hand. I don't like really thin fluids that can flash. When tapping, I tend to use a heavier grease.
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Old 21st February 2012, 11:56 PM   #14
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The smell of WD40 gives me a nasty headache.
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Old 22nd February 2012, 12:09 AM   #15
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For tapping I use neat engine oil.

For latheing I use a mixture of water and oil.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 22nd February 2012, 11:53 AM   #16
marce is offline marce  United Kingdom
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ISO and water mix will work for Ali
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Old 10th November 2014, 02:52 PM   #17
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Originally Posted by TheShaman View Post
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.
This is the best tip I have ever seen on cutting fluid! I've been trying to get Tap Magic Aluminum in France, but to no avail. I will try using the coconut oil. Cheap and non-toxic

Btw, I found this paper also:
Experimental Investigation on the Performance of Coconut oil Based Nano Fluid as Lubricants during Turning of AISI 304 Austenitic Stainless Steel
which states at the end of the paper:
In all the cases, coconut oil with 0.5% Nano Boric acid suspensions showed better performance compared to other Nano fluid in terms of cutting temperatures, tool flank wear and surface roughness.
The Great Saiyaman
Siapa bertelinga hendaklah ia mendengar... (Mat 13:9)
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Old 10th November 2014, 02:56 PM   #18
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I keep the used engine oil from my car in a container and use it as cutting oil.
Just don't touch it with your fingers as it is carcinogenic.
I keep dipping my drill bit in the oil.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 10th November 2014, 03:11 PM   #19
SY is offline SY  United States
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Rustlick Ultracut Pro, diluted with water 10:1. I think Grainger carries it.

(disclaimer- my company sells that stuff)
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 13th November 2014, 05:10 PM   #20
phase is offline phase  United States
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This stuff;
Aircraft Tool Supply Boelube Paste (4Oz Medium Blue): Industrial Hardware: Industrial & Scientific

The coconut oil sounds like it may be a winner also...
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