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Rather unorthodox, but hey, it worked

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  • Rather unorthodox, but hey, it worked

    So I had to mill an arc into the base of a ½ inch wide jam cleat I was making for the boom on my boat. The radius of the arc had to be 1 ¼ “ I didn’t have a ball end end mill with that radius but I did have a 2 ½” face mill but couldn’t figure out how to make it work on the mill. I know John S. did something like this on the back of a brass rack if I remember correctly but I couldn’t find the link. After thinking about this for a while I decided to move the job to the lathe. I mounted the part in a tool holder for my QCTP then set the tool holder height for center using my handy dandy laser center finder like this:


    I then mounted the face mill into the chuck. It had to be extended more than I liked in order to cut the length of the part without hitting the chuck but it was just going to be a light cut and only a few thou deep so I snuck up on it gently. Like this:


    All seemed fine so I engaged the feed and away we go:


    And here we are. Worked just fine.
    Ernie (VE7ERN)

    May the wind be always at your back

  • #2
    Nice work. That creates a nice shallow curve to the surface.

    Thanks for sharing.

    rock~
    Civil engineers build targets, Mechanical engineers build weapons.

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    • #3
      Sweet!

      Now you have me looking at some of the off the shelf things on my boats that I'm not happy with.

      For some reason I've made plenty of parts for the bikes, and cars, but projects for the boats have been limited to fiberglass or wood.

      What boat do you have?

      Ken.

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      • #4
        Originally posted by kendall
        Sweet!

        Now you have me looking at some of the off the shelf things on my boats that I'm not happy with.

        For some reason I've made plenty of parts for the bikes, and cars, but projects for the boats have been limited to fiberglass or wood.

        What boat do you have?

        Ken.
        Catalina 30 Ken
        Ernie (VE7ERN)

        May the wind be always at your back

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        • #5
          Good job. Good use of your imagination.
          Paul A.
          SE Texas

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

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          • #6
            Looks good Ernie. I use milling cutters frequently on the lathe for a variety of jobs. They make excellent boring bars in a wide variety of sizes.
            Free software for calculating bolt circles and similar: Click Here

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            • #7
              Very nice Dockrat.

              If you have to make any more.......and are still concerned about how far the cutter is sticking out, you could reduce the overhang and just cut half of the part.........then move the part over to the other side of the cutter and cut from the back side.

              Of course, you'll be cutting on the "upstroke" but that shouldn't be too bad. Especially since you're taking small cuts. The centerline of the cut shouldn't change and you'll still have the same result.

              That also allows you to be able to make an even longer cut if you happen to have a longer cleat to modify.

              Regards..........Rodg
              RPease

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              • #8
                While I am generally not a fan of holding milling cutters in a three jaw chuck in this case it seems to have worked rather well. And it is nice to see somebody else using a BVB-25 type lathe. But I was wondering if you were unable to reach the cutter with a live center in the tail stock?
                Forty plus years and I still have ten toes, ten fingers and both eyes. I must be doing something right.

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                • #9
                  This post ?

                  http://bbs.homeshopmachinist.net/sho...highlight=rack

                  .
                  .

                  Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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                  • #10
                    Originally posted by John Stevenson
                    Thats the one John. Thanks
                    Ernie (VE7ERN)

                    May the wind be always at your back

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                    • #11
                      Originally posted by dockrat
                      Catalina 30 Ken
                      Good boats, one of my old mooring neighbors had one. (his boat was nice, but he was a pain!)

                      I have two boats, an Ariel and a Triton (26 and 28ft respectively)
                      been lucky with the metal parts on my boats, every time I need or want something, I've run into someone who's upgrading.

                      Ken.

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