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  • What is it for?

    I picked up this tool makers square and included in the set was a "dog leg" piece. Is there a special purpose for it or just used as an offset.

  • #2
    its a die makers square

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    • #3
      Looks like it...

      If it's a "real" one, it will have some way to adjust the arm OUT of square by a small amount, which would correspond to the relief in the die.

      often there are one or two small set screws that the main screw pulls the arm back against. With those, you can set it to any slight angle, or no angle.

      The thin arms will go down in the die cavity to check the relief.
      1601 2137 5683 1002 1437

      Keep eye on ball.
      Hashim Khan

      If you look closely at a digital signal, you find out it is really analog......

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      • #4
        i have one [some bits missing], set at 5 degrees for extrusion dies bearings, havent filed one since 1979, wonderful tool, have fun [if you make dies that is]
        mark

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        • #5
          are those parts are from the same square? Left and bottom a small tool makers square - each blade has a small groove on the other side, down its length, right? The thin and dog leg look like from a die makers square. A die maker square permits and adjustment the pieces so they are angled, say 0-10 degrees off of 90 degrees. This is so it can be used to check the draft (?) on a die, the clearance angles after the opening
          in Toronto Ontario - where are you?

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          • #6
            mcgyver
            yes there is a groove they are upside down. I use them for making small parts where a larger square is too clumsy, and no I have no idea how to do die filing.
            Just was not sure what the offset piece was for.
            Thanks for the explaination

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            • #7
              irrelivant for most cases of die, i can only say about extrusion dies, after the die is made the thickness of the die varies to 'choke' metal into corners, they call the thickness the bearing, from the back [where the metal is forced in] to the front [where the extrusion exits] there is an angle of about 5 degrees as an average, less with a thicker than 1" die, so you sit in a chair with a vise at eye level, an anglepose on the bench with a 40w bulb in and boxes of needle files and file the angle on, without screwing up the EDM profile of the cavity, fun, fun, fun, then you get to polish it with a strip of emery pulled tight over a file [grind a little point on the end of a flat file to secure the emery cloth]
              after all that the die gets a trial on the press, if it works, repolish and harden it [nitride/ion nitride]

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              • #8
                Bent bit fits one of these:-


                Mark
                What you say & what people hear is not always the same thing.
                www.remark.me.uk

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                • #9
                  Originally posted by old-biker-uk
                  Bent bit fits one of these:-


                  Mark
                  OK, I'll bite. Just what the heck is "these"?

                  It looks like some kind of adjustable "square" but what is it used for? Die work again?
                  Paul A.
                  SE Texas

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

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                  • #10
                    Paul
                    Just that - an adjustable square for die & pattern work.
                    (I use it to see how far I am from being able to file 'square'!)
                    Mark
                    What you say & what people hear is not always the same thing.
                    www.remark.me.uk

                    Comment


                    • #11
                      Great!
                      I have one of those in the tool box that I always wondered about.
                      Good to see my ideas confirmed.

                      Ken.

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                      • #12
                        OK.....

                        Punching dies are relieved on the inside, meaning that the hole that the punch goes thru gets bigger further down. This is to let the work (or the punched-out scrap) fall away freely.

                        Molds are relieved wider towards the surface ("draft") so that the molded part can pop out. The draft is different for different surface textures in plastic molding.

                        Back in the day, dies were often made by marking out and filing to the line on a die filer (wow!). The inside relief was also filed on the die filer, by tilting the table the correct amount.

                        The square was to check the presence, and amount of, the relief (or draft) from the mold parting line or die top (cutting) surface. You'd run it around and verify that it passed all around in contact, so you knew the angle was present and at least the amount required.
                        1601 2137 5683 1002 1437

                        Keep eye on ball.
                        Hashim Khan

                        If you look closely at a digital signal, you find out it is really analog......

                        Comment

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