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What did I buy?

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  • What did I buy?

    Was pawing through the used tool section of a local shop and found a little box of hand-ground HSS boring bars. Randomly mixed in was this item:



    Given the dark-gray appearance, heavy weight, and mirror-finish polished pointy end, I thought it might be a solid carbide dead center. It was individually marked $1 so I shrugged and bought it. When I got it home, I found it mildly magnetic, and the point was able to scratch steel very easily.

    I know the above picture is the worst one in the world, but... what do you think? Dead center, or something else? If it is a dead center, can I just chuck it in my tailstock Jacobs chuck?

  • #2
    Hard to say because I can't see the end too clearly, but it closely resembles a diamond dresser for grinding wheels. Is there a dark thing brazed onto the end?

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    • #3
      Part of a broken carbide end mill.?

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      • #4
        Dead Center?

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        • #5
          Punch for an optical center punch?

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          • #6
            Originally posted by PixMan View Post
            Hard to say because I can't see the end too clearly, but it closely resembles a diamond dresser for grinding wheels. Is there a dark thing brazed onto the end?
            There is a second, more obtuse angle near the tip, but it's all one solid piece.

            Come to think of it, the included angle is 90°, not 60°, so maybe it's not a dead center after all?

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            • #7
              It's a left hand version of one of these.

              .

              Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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              • #8
                Tips for hardness tester?
                Probably carbide as it is also mildly magnetic.
                Either way dont use them as center punch.
                They will shatter in your hand.
                FSWizard - Free Online Speed and Feed Calculator

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                • #9
                  Must be my lucky day ------- SJ - forget the tool fool, i'll give you five pounds for that quarter you have...

                  can come up with the goods tomorrow morning (after I have my coffee)...

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                  • #10
                    It's an optical emission spectrometer electrode, should be 1/4" dia with a 90 degree inc point made of 99.99% Tungsten, looks like to me anyway!, mainly as I have a box of them that are too short to be used any more, it should feel quite weighty in your hand.
                    Mark

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                    • #11
                      I know what it isn't, a hardness testing indented. It does , however look like an punch from an optical center punch.Bob.

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                      • #12
                        Originally posted by boslab View Post
                        It's an optical emission spectrometer electrode, should be 1/4" dia with a 90 degree inc point made of 99.99% Tungsten, looks like to me anyway!, mainly as I have a box of them that are too short to be used any more, it should feel quite weighty in your hand.
                        It is quite hefty for something so small.

                        So, I got to thinking. Since the extreme tip has a slightly larger angle, the tip will not bottom out in a 90° hole. And, I also happen to already have a 90° spotting drill I can use to centerdrill stock. So even if this thing is properly a widget for some other application, I think I can still pervert it into use as a dead center.

                        It's too short to bottom out in my Jacobs chuck, though. I might need to drop a spacer into the bottom of my chuck to use it, as the steel chuck jaws probably won't be able to keep the carbide from slipping back under tool pressure.

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                        • #13
                          I ve heard somwhere regular jacobs chucks run out too much.
                          If you had one of them hi precission chuchs then that might habe veen a different story
                          FSWizard - Free Online Speed and Feed Calculator

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                          • #14
                            Either way dont use them as center punch.
                            They will shatter in your hand.
                            A former co-worker was using an old socket handle, ground to a point, as a punch.
                            It shattered when he hit it, and he had to have surgery to remove the shrapnel from his hand.

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                            • #15
                              Looks like a piece of micro-grain carbide to me.
                              I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

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