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Apparently the tang does NOT drive the tool....

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  • Apparently the tang does NOT drive the tool....

    I know, controversial subject.......

    Views of the tang on an MT3 shank 1.187" reamer which apparently was at some point driven by the tang.....



    1601

    Keep eye on ball.
    Hashim Khan

  • #2
    Yep, that's right, it will shear off many times if the taper slips. It don't look like the tapers were matching up well on your tool.

    Stuff happens.
    It's only ink and paper

    Comment


    • #3
      Originally posted by Carld
      Yep, that's right, it will shear off many times if the taper slips. It don't look like the tapers were matching up well on your tool.

      Stuff happens.
      Looking at the state of the taper on that it wasent too much of a suprise really? could do you some damage, and definatley chew your socket, soon it becomes everyday
      get a better tool i think?
      regards
      mark

      Comment


      • #4
        Tang

        The tang doesn't drive the tool. From the looks of the first photo the taper is in pretty bad shape. The ruff finish on the tool prevented it from locking. The tool tried to spin and sheared off the tang.
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        • #5
          I think J Tiers knew what happened and why and was just having fun with us .
          It's only ink and paper

          Comment


          • #6
            Well, I did clean up the dings on the taper with a burr file, but there were dings that were newer than the rusty old broken surface of the residual tang...... I don't know any more about the history or the order of events.... The taper might have got loose retracting the tool.

            Someone seems to have thought it was a good idea to drive nails or wedge up a machine with the taper. The odd thing is the reamer is still sharp.

            For sure if the taper is burred-up it is going to try to drive via the tang.
            1601

            Keep eye on ball.
            Hashim Khan

            Comment


            • #7
              Looks like it had a former alliance with a crescent wrench-
              I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

              Comment


              • #8
                cripes, on a reamer? what, the hole it was being feed into was only .500"?
                .

                Comment


                • #9
                  Originally posted by Mcgyver
                  cripes, on a reamer? what, the hole it was being feed into was only .500"?
                  Yea, but the reamer was 1.000"


                  rock~
                  Civil engineers build targets, Mechanical engineers build weapons.

                  Comment


                  • #10
                    The tang is only there to give you something to drift it out with that won't ding the taper.

                    Comment


                    • #11
                      rockrat, you tryin' to start trouble
                      It's only ink and paper

                      Comment


                      • #12
                        Originally posted by rockrat
                        Yea, but the reamer was 1.000"


                        rock~
                        reamer was bigger than 1", 1.1875 irrc
                        .

                        Comment


                        • #13
                          OK, I know I am going to get jumped on, but consider. The taper was driving it. The taper was in bad condition. The reamer jammed. The taper slipped and.....

                          the tang slammed into the socket with considerable force after the spindle continued to rotate a bit more. And the tang twisted and sheared off.

                          Now, would it have broke if the tang had been against the socket when the tool was first seated? Perhaps that would have provided enough extra drive to prevent the reamer from jamming.

                          All I am saying here is if we drive milling cutters with a single set screw against a flat on the shank (as in a mill holder), why is it so horrible to drive a tool with two flats on a tang?

                          And if the tang is not intended to drive the tool, why does the taper socket have a matching area that will attempt to drive it. This area is NOT necessary to allow tool extraction, nor is the more complicated geometry of a tang. A simple round (as in easily formed on a lathe) projection would allow tool extraction. I have added such features to Morse tapers that were tang-less and they work just fine.

                          I suggest that the shape of the tang strongly suggests that it was indeed intended to drive the tool. The fact that some break is of no more consequence than the fact that some drills and other cutters with straight shanks break when they jam. Tools just break if they are overstressed.

                          OK, I said it, now let the abuse begin.
                          Paul A.

                          Make it fit.
                          You can't win and there is a penalty for trying!

                          Comment


                          • #14
                            The driving of a weldon flat produces far more torque through a much thicker cross section than the tang on a morse taper.


                            The tang is also there to protect the bore from galling and scoring in the event the taper isn't seated tight enough. You need to be smart enough to realize that your taper has let go, and not continue to drive the tool without proper retention, and then you won't break tangs.

                            Comment


                            • #15
                              It's REALLY hard to stop the machine in the 5 degrees of rotation between a slipping taper and a broken tang.
                              Any products mentioned in my posts have been endorsed by their manufacturer.

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