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  • Rapid Tap cutting oil

    Anyone ever use Rapid Tap. I noticed today that anything which was coated with the oil has now turned a weird brownish color. Its not rust as it wipes off with a cleaner like WD40.

    Anyone run into this. Is it some sort of rust inhibitor or something.

  • #2
    Rapid Tap is to be avoided.
    For a few reasons.

    What you are describing is one of them.

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    • #3
      Rapid Tap is among my favorite machining goos and glops. Great stuff for most any metal but expensive for any but dab at a time use. So the residues cling and turn brownish. As you say they wipe off. But so should all machining aids some of which harden to a film, corrode, rust, tarnish, smell bad etc.

      When you're done with a part you clean it up, deburr it, touch up, fettle and tittivate, whatever but you don't leave finished machined parts covered in coolant residues.

      Every beneficial thing has downsides, side effects, disadvantages. If Rapid Tap residues after some days of neglect results in an ugly brownish film, it's no big deal. Clean it up and go on with life.

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      • #4
        Your skin is an organ.
        Avoid extended exposure to compounds that have in them,
        agents that seep deep into your skin.

        One way to "get on with life".
        Last edited by Old Hat; 01-24-2015, 11:23 PM.

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        • #5
          It hasn't been the "old" rapid for a long time... has none of the good stuff (for tapping) anymore - trichloroethylene

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          • #6
            smells good but wives do not like
            https://www.flickr.com/photos/csprecision

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            • #7
              In the day, girls liked the smell on a guy, of the cutting oil used in screw-machine shops!

              Ya know...... looking back, I may have miss-read that, hmmnnnn?

              Screw-machine shop = job. Job = money. Guy with money = upward mobility.

              HEY!

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              • #8
                Originally posted by lakeside53 View Post
                It hasn't been the "old" rapid for a long time... has none of the good stuff (for tapping) anymore - trichloroethylene
                trichloroethylene, makes it all the way to your liver.

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                • #9
                  I still have a small can of the old stuff.

                  JL................

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                  • #10
                    Okay, so riddle me this. Will the remaining brown finish prevent or cause rust. I dont like the brown finish but it does wipe off, so its not that big of a deal. I however dont want to find that it eventually rusts parts or tooling. If so ill switch to something else.

                    I havent been using it that long but noticed that my drill chuck and lathe handles turned brown and I couldn't figure out why.

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                    • #11
                      Originally posted by Old Hat View Post
                      trichloroethylene, makes it all the way to your liver.
                      Yes, but it hasn't been in Rapid Tap for a decade or more, maybe 2.

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                      • #12
                        Originally posted by Axkiker View Post
                        Okay, so riddle me this. Will the remaining brown finish prevent or cause rust. I dont like the brown finish but it does wipe off, so its not that big of a deal. I however dont want to find that it eventually rusts parts or tooling. If so ill switch to something else.

                        I havent been using it that long but noticed that my drill chuck and lathe handles turned brown and I couldn't figure out why.

                        I use it often. It won't cause rust. Probably won't prevent it any more then a light oil will.

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                        • #13
                          Originally posted by JoeLee View Post
                          I still have a small can of the old stuff.

                          JL................
                          Cherish it above all others.
                          The shortest distance between two points is a circle of infinite diameter.

                          Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

                          Southwestern Ontario. Canada

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                          • #14
                            Originally posted by Forrest Addy View Post
                            When you're done with a part you clean it up, deburr it, touch up, fettle and tittivate, whatever but you don't leave finished machined parts covered in coolant residues.
                            Don't leave cutting oil, especially water soluble on your machine either, it will stain them.

                            Old hat, to prevent trichloroethylene, or other harmful chemicals, from getting into your liver you have to keep the liver completely filled with alcohol residue. This will block the liver so new chemicals can't enter.
                            The shortest distance between two points is a circle of infinite diameter.

                            Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

                            Southwestern Ontario. Canada

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                            • #15
                              I bought Rapid Tap to see what so many people rave about. Not impressed.

                              I find Ridgid cutting oil works better. It does stink, but not a problem unless I have to wash up and comb my hair and deal with polite society.

                              For small taps and dies, castor oil works better than either. And just recently, I found that using neat's foot oil results in the lowest threading torque of all.

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