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How to cut a coffee plunger pot?

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  • How to cut a coffee plunger pot?

    I have one of these..


    ..they are stainless steel double wall and quite thin gauge. I would like to cut around near the top of the pot to get two stainless steel pots for a Stirling engine project.

    But how to cut it neatly? Put it in a lathe and use a thin abrasive wheel cutter mounted on the tool post maybe?

    Thanks for any advice..

  • #2
    Set on a flat surface. Use a height gauge or scribe to put a line around where you wish to cut. Then use a belt sander to cut to line.

    Bob

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    • #3
      Originally posted by Bob Ford View Post
      Set on a flat surface. Use a height gauge or scribe to put a line around where you wish to cut. Then use a belt sander to cut to line.Bob
      I'd do what Bob said except instead of a belt sander, a dremel with a cut off disc.

      Steve

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      • #4
        Originally posted by The Artful Bodger View Post
        Thanks for any advice..
        Brew yourself a nice fresh pot of coffee, and sit down with it for a good think?

        Could you chuck the bottom enf of it in a lathe? If so, make a sacrificial wood or MDF plug (leave a hole or a string tab so you can get it out again) which you push in from the top end to support the metal from buckling inwards at the height you want to take the cut, then part it off carefully with a sharp parting tool and low speed. Push the plug to the lower cut location(s) and repeat for as many tube sections as you need.
        Last edited by Euph0ny; 01-09-2014, 03:12 AM.

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        • #5
          dremel cut off wheel (or equivalent) in a mill or drill press. Should get you a parallel cut - I've seen people cut down Maglites and reflectors the same way and it seems to work well.

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          • #6
            Cut it off anyway you can. Make it "clean and accurate" after with a 12 inch disk sander or whatever.

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            • #7
              Zip wheel on a grinder would be better then a Dremel.
              The shortest distance between two points is a circle of infinite diameter.

              Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

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              • #8
                Originally posted by Euph0ny View Post
                ... chuck the bottom end of it in a lathe? If so, make a sacrificial wood or MDF plug ...
                or an expanding arbor-like fixture to grip from inside and eliminate external chucking.

                I think EuphOny's proposal has merit especially for single wall material,
                but wonder what would happen working with double-wall.

                .

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                • #9
                  With epoxy, perhaps attach the base of the pot to a
                  a disk of some metal. This disk would facilitate use of
                  the lathe tail stock without direct contact to the pot.

                  Once finished, heating the disk/pot will cause the cured
                  epoxy bond to fail and release the disk from the pot

                  Test this with scrap first - I believe getting the temperature
                  into the vicinity of 200 - 250؛F will soften the epoxy, but
                  YMMV. A paint stripper gun might do the job or I guess a
                  stove burner certainly would.

                  .

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                  • #10
                    Thanks for all the suggestions but at the end of the day I realised I had been overthinking the project and 3 minutes on the bench grinder did the trick!

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                    • #11
                      I was going to suggest the carefull use of a light saber, but seeing as its done I wont have to.
                      My neighbours diary says I have boundary issues

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                      • #12
                        Where's the fun in that ?

                        .

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                        • #13
                          Originally posted by The Artful Bodger View Post
                          ... 3 minutes on the bench grinder did the trick!
                          Did that include making the coffee? :-)

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                          • #14
                            I say shape charges.

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