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  • Flexure Cut Off Blade Holder

    Somewhere In the last week I saw a one piece cut off blade holder. It was machined away on the back to fit into a 250 style lathe bit holder. The front was machined wide (high) enough for an insert type parting blade. At the time I thought that makes perfect sense. I'm going to make one. Now my brain is messing with me. I did a quick pencil sketch, but it just doesn't look right. Like I am missing something. Has anybody seen a cut off blade holder along these lines recently? Got a link?

    Attached Files
    *** I always wanted a welding stinger that looked like the north end of a south bound chicken. Often my welds look like somebody pointed the wrong end of a chicken at the joint and squeezed until something came out. Might as well look the part.

  • #2
    Like.

    --Doozer
    DZER

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    • #3
      I'm not a talented sketch artist, but that distortion is camera angle. My sketch doesn't look THAT bad. LOL
      *** I always wanted a welding stinger that looked like the north end of a south bound chicken. Often my welds look like somebody pointed the wrong end of a chicken at the joint and squeezed until something came out. Might as well look the part.

      Comment


      • #4
        One something like this Bob? I think I may even have one like it....somewhere.

        https://www.abmtools.com/product/par...er-for-blades/


        Click image for larger version

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        Home, down in the valley behind the Red Angus
        Bad Decisions Make Good Stories​

        Location: British Columbia

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        • #5
          Originally posted by Willy View Post
          One something like this Bob? I think I may even have one like it....somewhere.

          https://www.abmtools.com/product/par...er-for-blades/


          Click image for larger version

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ID:	1986797
          That is sorta similar, but the one I saw definitely one piece with a flexure.
          *** I always wanted a welding stinger that looked like the north end of a south bound chicken. Often my welds look like somebody pointed the wrong end of a chicken at the joint and squeezed until something came out. Might as well look the part.

          Comment


          • #6
            Sorry, missed the flexure in the title and I certainly should have seen that feature in your sketch.
            The only type I remember seeing with a flex type grip is also made by ABM tools, among others I'm sure.
            Although the concept is somewhat similar the execution is vastly different.

            Click image for larger version

Name:	parting_tool_holder.jpg
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Size:	29.0 KB
ID:	1986809
            Home, down in the valley behind the Red Angus
            Bad Decisions Make Good Stories​

            Location: British Columbia

            Comment


            • #7
              Iscar and Kennametal both make the type you are looking for-

              https://www.dansdiscounttools.com/pr...ock-a2ten1632/

              If you build one, I can suggest an improvement. Add a couple fine thread setscrews in between the clamping bolts to jack the flexure open making it easier to adjust the stickout. The ones I have used are tough to slide the tool into/through without tapping the blade with a hammer and Aluminum block.

              Here's the Iscar version-

              https://www.ebay.com/itm/12371826534...oAAOSwkV5aaPHx
              Last edited by wierdscience; 02-16-2022, 12:14 AM.
              I just need one more tool,just one!

              Comment


              • #8
                Originally posted by wierdscience View Post
                Iscar and Kennametal both make the type you are looking for-

                https://www.dansdiscounttools.com/pr...ock-a2ten1632/

                If you build one, I can suggest an improvement. Add a couple fine thread setscrews in between the clamping bolts to jack the flexure open making it easier to adjust the stickout. The ones I have used are tough to slide the tool into/through without tapping the blade with a hammer and Aluminum block.

                Here's the Iscar version-

                https://www.ebay.com/itm/12371826534...oAAOSwkV5aaPHx
                Jack screws is a good idea. I hadn't thought of that.

                Originally posted by Willy View Post
                Sorry, missed the flexure in the title and I certainly should have seen that feature in your sketch.
                The only type I remember seeing with a flex type grip is also made by ABM tools, among others I'm sure.
                Although the concept is somewhat similar the execution is vastly different.

                Click image for larger version  Name:	parting_tool_holder.jpg Views:	6 Size:	29.0 KB ID:	1986809
                Now that's a different way of doing it. I like that one too.
                *** I always wanted a welding stinger that looked like the north end of a south bound chicken. Often my welds look like somebody pointed the wrong end of a chicken at the joint and squeezed until something came out. Might as well look the part.

                Comment


                • #9
                  Originally posted by Willy View Post
                  Sorry, missed the flexure in the title and I certainly should have seen that feature in your sketch.
                  The only type I remember seeing with a flex type grip is also made by ABM tools, among others I'm sure.
                  Although the concept is somewhat similar the execution is vastly different.

                  Click image for larger version

Name:	parting_tool_holder.jpg
Views:	478
Size:	29.0 KB
ID:	1986809
                  I've made one of these to hold a piece of regular hacksaw blade sharpened as parting blade.
                  Helder Ferreira
                  Setubal, Portugal

                  Comment


                  • #10
                    Originally posted by Bob La Londe View Post
                    Somewhere In the last week I saw a one piece cut off blade holder. It was machined away on the back to fit into a 250 style lathe bit holder. The front was machined wide (high) enough for an insert type parting blade. At the time I thought that makes perfect sense. I'm going to make one. Now my brain is messing with me. I did a quick pencil sketch, but it just doesn't look right. Like I am missing something. Has anybody seen a cut off blade holder along these lines recently? Got a link?
                    If you going to make a holder, may I suggest a direct mount to your post. This way the blade overhang will be smaller and your tool will be better supported by the compound. I was thinking to do just that for my BXA (250) post, but bought a 2 pc version from Shaars. May still do it one day...

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                    • #11
                      EDIT: Never mind (brain fart) - I didn't see that ledge on the bottom where the blade would sit. I still like the idea of clamping on the edges.
                      __________________________________________________ _____________

                      The one that you sketched is fundamentally different from the others in that although the blade is supported on the bottom, as it has to be, it is clamped by its sides. Which means evenly along the whole length of the holder. I like it!

                      If you make one (please do), be sure to post about it.
                      Last edited by Bob Engelhardt; 02-16-2022, 10:36 AM.

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                      • #12
                        Here's an interesting & very simple one that uses side clamping, but with a 2-piece wedging action; the force being supplied by the holder:
                        https://www.aliexpress.com/item/4001243858781.html

                        Last edited by Bob Engelhardt; 02-16-2022, 10:37 AM.

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                        • #13
                          I first interpreted your sketch to mean something like this:
                          Click image for larger version

Name:	Cut off holder.jpg
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ID:	1986864

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                          • #14
                            The adjuster is an unintentional misdirect. I should not have put one on this part.
                            *** I always wanted a welding stinger that looked like the north end of a south bound chicken. Often my welds look like somebody pointed the wrong end of a chicken at the joint and squeezed until something came out. Might as well look the part.

                            Comment


                            • #15
                              Bob, you're not wrong about seeing that style of flexure holder in the past week. I'm pretty sure it was well displayed in a YT video that I also saw. But like you I hope no one asks WHICH video. The method also struck me as being very home shop friendly.

                              It's worth noting that the flexure web in your sketch is only the width of the one saw cut running down from the top. And the narrow width of that means that you will need to strictly limit the amount of movement needed so that small area isn't stressed into cracking.

                              Your sketch also includes a height adjuster. But the sketch shows a bar which would clamp into a holder that has its own height adjuster. So really that whole top between the mounting bar and the part with the setscrews could be relieved down to just over the height of the securing bar and make for a much wider flexure joint which would give a zero risk of any stress cracking.

                              Chilliwack BC, Canada

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