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A new attempt at making piston rings

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  • That's not even a v-groove holder. It's a flat bottom. Shame on me.
    Brian Rupnow
    Design engineer
    Barrie, Ontario, Canada

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    • I just got a quote from Caliber Industrial Supply in Ontario for one Thin-bit holder and two very narrow carbide tips (which they sell in minimum quantities of 10) for a grand total of $429.00 Canadian funds. This makes the $75 I just paid for a double ended HSS tool look pretty darned cheap by comparison.---Brian
      Brian Rupnow
      Design engineer
      Barrie, Ontario, Canada

      Comment


      • Originally posted by brian Rupnow View Post
        I just got a quote from Caliber Industrial Supply in Ontario for one Thin-bit holder and two very narrow carbide tips (which they sell in minimum quantities of 10) for a grand total of $429.00 Canadian funds. This makes the $75 I just paid for a double ended HSS tool look pretty darned cheap by comparison.---Brian
        I have both commercial and homemade thinbit holders. They are pretty easy to make. Prices north of the border are just insane. They have packages of assorted size bits, I have a couple packs.

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        • Many years ago I made toolholder that held a dnmg insert on the side. That allowed me to grind spent inserts into special small grooving tools. Worked great and I still use it quite a bit. Even though the tip is gone on an insert, there is still a useable chuck of good carbide contained within. Remember the goal of a machinist is simply to present a suitable cutting edge to the work piece to do the job at hand....

          Some old timers I used to work with would braze an old insert to a chunk of steel, resharpening into whatever edge they needed. They'd use it till it was gone, then braze another one on. Whatever works.

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          • Originally posted by Dan Dubeau View Post
            Some old timers I used to work with would braze an old insert to a chunk of steel, resharpening into whatever edge they needed. They'd use it till it was gone, then braze another one on. Whatever works.
            I have done that many times to whip up a boring bar, works great.

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            • Originally posted by Sparky_NY View Post

              I have done that many times to whip up a boring bar, works great.
              Yup, it's an arrow worth having in your quiver for sure.

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              • This is a video I made today, 11-june-2021 of my vertical i.c. engine 2021. I have been trying to make a set of cast iron rings for the piston, and as part of that I built a new cylinder and new piston to accept cast iron rings, but ultimately I was not successful. Finally I decided that I should put this engine back together, so I enlarged the top ring groove to .093" wide x 0.058" deep and put a Viton ring on it. This engine can now go up on the shelf with all of my other engines. I am still after cast iron rings that actually work, but will be trying them out on a different engine that is a lot simpler to take apart and access the piston.----Brian
                https://www.youtube.com/watch?v=05WlBP_TUFw
                Brian Rupnow
                Design engineer
                Barrie, Ontario, Canada

                Comment


                • And this is one of my other engines which I tried to run cast iron rings on and failed miserably. I have restored the original piston with a Viton ring on it, and of course it runs like a trooper. I wanted to make sure that both engines ran well before putting them back up "on the shelf". This engine is a noisy devil, because the spur gears are not enclosed in a metal housing. I am still pursuing the cast iron ring magic, but I'm not there yet. I have another engine to try cast iron rings on, but it is a much simpler engine to change pistons on.----Brian
                  https://www.youtube.com/watch?v=LTsawOLaNGU
                  Brian Rupnow
                  Design engineer
                  Barrie, Ontario, Canada

                  Comment

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