Aluminium for LTD Stirling

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Aluminium for LTD Stirling

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Viewing 14 posts - 1 through 14 (of 14 total)
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  • #292462
    PaulR
    Participant
      @paulr

      Despite two previous Stirling failures (made 'by eye' without any plans) and one moderate success I'm going to attempt a simple LTD/Ringbom type engine. It calls for two circles of aluminium plate, one 8mm thick, the other 5mm thick and both about 4.5" diameter.

      These sizes seem too thick for plate and too large a diameter for bar – can anyone suggest a source (preferably one that won't break the bank (I've never machined aluminium before and expect to make one of two mistakes 😀 )

      Cheers

      Paul

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      #29698
      PaulR
      Participant
        @paulr
        #292463
        Michael Gilligan
        Participant
          @michaelgilligan61133

          Talk nicely to someone at Richard Austin Alloys:

          **LINK**

          http://www.raaltd.com/aluminium-plate-products.html

          … They sell offcuts.

          MichaelG.

          #292466
          JasonB
          Moderator
            @jasonb

            5mm and 8mm plate are readily available on the likes of e-bay in offcuts or cut to size

            This is one such piece of 8mm that came my way via e-bay, I usually use this seller for ali

            Noggin End also do a range of sheet/plate in small sizes

             

            Edited By JasonB on 07/04/2017 20:05:20

            #292468
            SillyOldDuffer
            Moderator
              @sillyoldduffer
              Posted by Michael Gilligan on 07/04/2017 19:25:18:

              Talk nicely to someone at Richard Austin Alloys:

              **LINK**

              http://www.raaltd.com/aluminium-plate-products.html

              … They sell offcuts.

              MichaelG.

              Another interesting link Michael. It's given me a new word: apparently "Shate" is defined as the "overlap between sheet and plate."

              Excellent word – it will come in handy whenever I have an 'expletive deleted' moment in front of mother.

              Cheers,

              Dave

              #292472
              PaulR
              Participant
                @paulr
                Posted by SillyOldDuffer on 07/04/2017 19:57:01:

                Another interesting link Michael. It's given me a new word: apparently "Shate" is defined as the "overlap between sheet and plate."

                Sounds like the Geordie pronunciation for you know what!

                @Michael Thanks for the link – added to my stash

                @Jason Doh, why didn't I think of eBay?! Plenty of suitable bits on there, cheers.

                Just need to figure how I'm going to turn/groove the bottom plate that has no central hole – super-glue and cross everything I suppose…

                #292473
                JasonB
                Moderator
                  @jasonb

                  Fix it to a faceplate by the corners to do the groove before you cut them off.

                  #292475
                  PaulR
                  Participant
                    @paulr
                    Posted by JasonB on 07/04/2017 20:19:04:

                    Fix it to a faceplate by the corners to do the groove before you cut them off.

                    Good idea! At the risk of going way off topic… Any tips for turning the outside diameter? I've used super-glue and/or a wood pad and a live centre in the past. I'm sure I once saw someone turning a disk held with wax somewhere on the net…

                    #292501
                    JasonB
                    Moderator
                      @jasonb

                      I've not tried wax but the watch makers tend to use that or shelac. Another alternative is thin double sided tape and a pad to aply pressure from the tailstock.

                      #292504
                      Michael Gilligan
                      Participant
                        @michaelgilligan61133

                        Paul,

                        In this context the term 'wax' refers to something like sealing wax [or the stone-cutter's 'dop wax'], which is based on Shellac.

                        Pure Shellac is fine for small pieces.

                        MichaelG.

                        .

                        Good video [with bad music] here: 

                        https://m.youtube.com/watch?v=C70qBYtvEyA

                        Excellent article [and larger scale] here:

                        http://www.snclocks.com/TechnicalInformation/Tid-Bits/Tid-Bit-2-Using-a-wax-chuck/i-m84DvXF

                        Edited By Michael Gilligan on 08/04/2017 08:11:37

                        #292513
                        SillyOldDuffer
                        Moderator
                          @sillyoldduffer
                          Posted by PaulR on 07/04/2017 20:32:57:

                          Posted by JasonB on 07/04/2017 20:19:04:

                          … Any tips for turning the outside diameter? …

                          I rounded the aluminium square plate by facing a short length of 32mm aluminium rod and supergluing it to the centre of the plate. Although I was nervous that this wouldn't be strong enough (and took gentle cuts only) at the end I had to warm the work on an electric cooker ring to break the bond. Warming with a blowlamp works too.

                          Isopropyl Alcohol is fairly good at cleaning up the residue.

                          The secret of using superglue successfully for this is new glue, absolute cleanliness and not moving the joint while the glue takes effect. The slightest trace of oil or grease seems to seriously weaken the bond as does fussing with the alignment during the setting period.

                          Dave

                          #292524
                          Ian S C
                          Participant
                            @iansc

                            My 8" diameter LTD Stirling Engine started life as two frying pans found in a skip, top 3 mm, bottom 5 mm thick, there was enough left of the 5 mm pan to make the rim of the flywheel.

                            Ian S Cdsc01238 (1024x768).jpg

                            Edited By Ian S C on 08/04/2017 11:05:51

                            #292535
                            PaulR
                            Participant
                              @paulr

                              Thanks to all for the tips. The shellac idea looks neat, I suppose I could make a little stubby 'faceplate' to stick it to rather than play a flame over the real one. Looks like a really nice finish on that bit of brass in the video.

                              Ian, that's monstrous (in a good way)! I don't hold out much hope of randomly finding a frying pan in a skip although I think we have some Trangias and mess tins lying around from when the kids did their DofEs but I bet they are nowhere near thick enough.

                              #292945
                              Ian S C
                              Participant
                                @iansc

                                Yes Paul it is quite large, but I had the fry pans, and a bit of plastic tube, and some 5 mm nylon bolts (to join the two aluminium plates.

                                Ian S C

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