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  • What are these?

    Any idea what these are?


  • #2
    Broaches for final sizing of holes.
    1973 SB 10K .
    BenchMaster mill.

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    • #3
      Broaches

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      • #4
        Thanks.

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        • #5
          I've never seen finishing broaches before.
          Looks looks like they're made to do all four sides of the hole in one shot.
          I wonder how close to finish dimensions you have to get before using one of those?

          JL........

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          • #6
            I see the cutting teeth, but what are the diagonal slots for?

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            • #7
              Usually the last few thou. or so. Neat process.
              1973 SB 10K .
              BenchMaster mill.

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              • #8
                Originally posted by JoeLee View Post
                I've never seen finishing broaches before.
                Looks looks like they're made to do all four sides of the hole in one shot.
                I wonder how close to finish dimensions you have to get before using one of those?

                JL........
                Sharpish inside corners demanded by some applications, only broaching will do so after rough milling, broaching is very accurate.. The length and number of teeth determine the rough hole size.
                The more irregular the rough opening is the longer the broach needs to be.

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                • #9
                  Originally posted by Bented View Post

                  Sharpish inside corners demanded by some applications, only broaching will do so after rough milling, broaching is very accurate.. The length and number of teeth determine the rough hole size.
                  The more irregular the rough opening is the longer the broach needs to be.
                  These are the longest broaches I have.
                  These are nice because it does the slot in one pass. No need for shims. Just need a lot of room to set everything up.
                  I rigged my set up with a threaded rod to pull the broach through.

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

                  Click image for larger version

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                  • #10
                    I am curious. Who makes them? Who sells them? Any web sites?
                    Paul A.
                    SE Texas

                    And if you look REAL close at an analog signal,
                    You will find that it has discrete steps.

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                    • #11
                      Originally posted by polaraligned View Post
                      I see the cutting teeth, but what are the diagonal slots for?
                      The slots? What are they for? They look like lubrication slots, not fpr cutting. Curious also. JR

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                      • #12
                        it looks like the diagonal grooves are the cutting teeth. they are on 2 sides in one part off the broach, and the other 2 sides a little farther up it.

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