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What cutting oil do you guys use ?

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Old October 16th, 2012, 05:26 PM   #1
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What cutting oil do you guys use ?

OK
My pull through reamer finally showed up, what cutting oil do you guys use?
I have a can of "Tap Magic" and some good old Ridged dark threading oil, Is there something better? I also have some Mobil water soluble oil.
The drive rod I got with the reamer [from Midway] is not perfectly straight, It only has a slight wobble to it, should I lube it up with some grease?
OK when I hook up my drill should I spin it ...
just kidding Tap handle only.

Do any of you guys shorten the drive rod? It seems to be awfully long, its a good thing I have long arms.
Thanks for any help.

Casey

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Old October 16th, 2012, 06:48 PM   #2
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read the ptg website it recomends several good fluids. I myself use rigid cutting oil with 20%atf added.

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Old October 16th, 2012, 09:31 PM   #3
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Gosh, I think I have tried ALMOST everything out there. Here is the ABSOLUTE best stuff I have ever forund. It is almost REQUIRED when you cut chambers on M1903A3 barrels as even though they are not chrome lined, they were work hardened so much this is the ONLY stuff that works well on them. Machinists who have worked in the trade for years absolutely LOVE this stuff. You may be able to buy smaller size bottles and tubes from your local Fastenal dealership.


http://www.fastenal.com/web/products...ex?sku=0316633

Thanks from stoky
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Old October 17th, 2012, 10:45 AM   #4
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I like Tap Magic, but I think I will order some of the stuff Gus posted about. I don't rmember ever trying it. I use Tap Magic pretty much daily for drilling,reaming, tapping and general machining. It will help you get a nice finish on a lot of soft material.

Unrelated tip: For plastics use soap as a cutting fluid. I use some pink stuff they used to put in the bathrooms here.

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Old October 17th, 2012, 11:21 AM   #5
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High sulfur oils always have worked well for me. I would use the Rigid oil of the ones you listed. I use Mobil 1 a lot for general use but prefer the heavy / dark oils for reamers or heavy tapping.

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Old October 17th, 2012, 02:10 PM   #6
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Mike o cut

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Old October 17th, 2012, 02:41 PM   #7
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LOL. I've used WD40 and 3 in One when tapping clip guides, recrowning M1s, and reaming FHs.. I've used dark raw Tung Oil for carburizing small parts. Heat em up and quench em can of Real Milk Paint RTO. Keep a fire extinguisher close by just in case of any combustion...

I'm a cheap bastardo with a smoked up basement....

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Old October 17th, 2012, 05:09 PM   #8
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Thanks guys,
I ordered a 16 Oz bottle of the "Mike O Cut" Gus recommended, we have a Fastenal store here in town and I had them order it for me and it should be in Monday. This will be my first chamber I cut and I want to do it right, Its funny, I will jump right in there and cut holes for the side pipes in a $40,000 aluminum Cobra body but cutting a chamber in a $140.00 barrel worries me.

Casey

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Old October 17th, 2012, 08:14 PM   #9
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Lube the pilot well, have a good supply of oil and a chip / paint brush for chips and you are good to go.

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Old October 17th, 2012, 08:45 PM   #10
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kerosene for aluminum
ATF for steel or iron

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Old October 17th, 2012, 09:36 PM   #11
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I use beeswax to tap brass and to cut aluminum on a miter box and table saw, it helps keep the teeth from loading up.

Casey

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Old October 17th, 2012, 10:58 PM   #12
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Crisco ( white stuff) works well for plastics, nylon drilling.

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Old October 18th, 2012, 10:04 AM   #13
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Quote:
Originally Posted by MemphisMachinists View Post
I like Tap Magic, but I think I will order some of the stuff Gus posted about. I don't rmember ever trying it. I use Tap Magic pretty much daily for drilling,reaming, tapping and general machining. It will help you get a nice finish on a lot of soft material.

Unrelated tip: For plastics use soap as a cutting fluid. I use some pink stuff they used to put in the bathrooms here.
You may find the consistancy of Mike o Cut a bit strange when you first use it. Though basically clear, it is THICK for a cutting fluid.

Unrelated tip: Back in the days you could still get it or render it yourself, lard was also used quite successfully as a cutting fluid. However, Mike O Cut has it beat hands down.

Of course if you go back early enough in the trade, flax seed oil and olive oil were also used as lubricating or tapping fluids. The problem with them is you don't want to use them in the summer as Bee's are REALLY attracted to them.

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Old October 18th, 2012, 10:22 AM   #14
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A vendor told me Tap Magic had to change it's formula to meet an EPA spec a few years ago and further stated the new didn't work as well.

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