Home › Forums › Bows and Equipment › ARROW SHAFTS DIAMETERS?

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    • Forresterwoods
      Member
        April 13, 2016 at 5:00 pm
        Post count: 104
        #5787

        Has anyone eles notice the older tapering tools from Tru-Center have larger diameters than the newer ones?

        The taper tool sleaves from the 1980’s were: 5/16 (8.25mm), (11/32 (9.00mm), and 23/64 (9.50mm).

        The newer taper tool is: 5/16 (8.10mm), 11/32 (8.85mm), and 23/64 (9.25mm). I personally like the 9.00mm…or .357 in decimal…as that more closely matches the OUTSIDE diameter of the 11/32 points and sits flush. Any thoughts on this?

      • Stephen Graf
        Moderator
          April 14, 2016 at 11:11 am
          Post count: 2427
          #53034

          While I am a firm supporter of converting to the metric system, it seems odd to me to be mixing your imperial and metric dimensions here.

          That said, here’s the conversion for the 5/16 diameter : 8.25mm = .3248 inches and 8.10mm = .3189 inches. The difference between these two diameters is .0059 inches.

          Normal manufacturing tolerance is +/- 0.0025 thousandths. So if their manufacturing target was somewhere in the middle, the difference could be explained by one part being high and the other part being low.

          5/16 = 0.3125 inches, which is less than either of the specified measured diameters. If the change in diameter was intentional, maybe the manufacturer got complaints about sloppy fit and off-center tapers. I know my taper tool is older and sloppy.

          Measuring one tool won’t tell you anything about their production. You would need to measure many tools. Or….. Call them up and ask.

          I got a woodchuck taper tool. Man that thing is sweet! But it cost a pretty penny….

        • Forresterwoods
          Member
          Member
            April 14, 2016 at 5:49 pm
            Post count: 104
            #56141

            Yes I understand the taper tool dimensions are determined by the ATA (Archery Trade Association) but I haven’t gotten hold of them yet.

          • Stephen Graf
            Moderator
              April 15, 2016 at 11:09 am
              Post count: 2427
              #7682

              Calling 3Rivers would be your best bet. I think they are the ones that make it.

              The ATA is just a trade organization.

              There are ASTM standards for archery, which probably cover taper dimensions, but I doubt they cover taper tool design tolerances.

            • Forresterwoods
              Member
              Member
                April 15, 2016 at 3:09 pm
                Post count: 104
                #9652

                Yeah I called Three Rivers but didn’t get much of an answer. Not a big deal…I’ll continue making arrows based on spine and weight which is most important anyway. If the diameter is on the fat side of 11/32 say or the thin side…I’ll leave instructions on how best to taper.

              • Donald Hoffman
                Member
                  January 10, 2018 at 7:38 pm
                  Post count: 10
                  #129921

                  If my tapers using my taper tools are a little off I just work them down a little with some Emory boards that are used for filing fingernails.

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