Stuart beam engine advice

Stuart beam engine advice

Home Forums General Questions Stuart beam engine advice

Viewing 14 posts - 1 through 14 (of 14 total)
  • Author
    Posts
  • #821858
    StewA
    Participant
      @stewa

      Hi, I have just purchased a part finished Stuart beam engine from the auction site we all know and love.

      I am making a list of everything I need to complete it. All the castings are there although they appear to have been machined by someone who was blind in one eye and couldn’t see out of the other one.

      I am missing one crankshaft bearing, would it be OK to make one from phosphor bronze as a new one from Stuart is silly money. Also what thickness and material should I use for gaskets.

      TIA

      #821864
      JasonB
      Moderator
        @jasonb

        No problem with making new bearings. Even cheaper and easier would be to make the pedestal from aluminium and then have a solid or split bronze bearing to fit that. Have a look at this post of mine for how to go about it.

        I tend to use a liquid gasket so don’t make any allowance for the thickness. If you want to use a proper paper gasket then then allow 4to 5 thou for something like Oakenstrong.

         

        #821867
        StewA
        Participant
          @stewa

          JasonB I have the outer bearing and pedestal I’m only short of the inner bearing. Would phosphor bronze be OK? Looking at the current parts list Stuart seem to be using brass for the bearings.

          I’ve been looking for Oakenstrong gasket paper but the only place I’ve seen it is Stuarts and the price is eye watering.

          #821890
          JasonB
          Moderator
            @jasonb

            It was the gun metal bearing that I was talking about not the cast iron outrigger support pedestal.

            Stuart’s on the right, fabricated on the left.

            bearing

            DSC04179

             

            For the amount of running it is likely to get then brass or one of the bronzes will be fine, If you have got to buy it in then 660 bronze would be my choice.

             

            #821897
            StewA
            Participant
              @stewa

              JasonB nice job, I’ve got some bronze I can use. I’ve a lot of work to do on base first, all the holes have been drilled in the wrong place, I need to plug them all and redrill them.

              Any idea where to get the Oakenstrong paper from?

              #821898
              Clive Brown 1
              Participant
                @clivebrown1
                On StewA Said:

                Any idea where to get the Oakenstrong paper from?

                Brown manilla envelpes are a good, traditional source of gasket material for model engineering.

                #821903
                JasonB
                Moderator
                  @jasonb

                  Sheet of Flexoid off ebay will do several engines and easier to come by than the now Klinger produced Oakenstrong, 0.15mm with do.

                  #821906
                  StewA
                  Participant
                    @stewa

                    I’ve looked at Flexoid but the specs say not suitable for steam. Are the manilla envelopes OK for steam?

                    #821909
                    JasonB
                    Moderator
                      @jasonb

                      Oakenstrong is also listed as unsuitable for steam, see section 10. Even the image on Stuart’s site says “for petrol & oil joints”

                      But it and Flexoid work OK with the low steam pressures your engine is likely to see. Both are a far better material than an old envelope or brown wrapping paoer soaked in oil but both of those work too.

                       

                      #821912
                      StewA
                      Participant
                        @stewa

                        Thanks JasonB, I thought that as Stuart supply Oakenstrong it must be perfect for the job. I’ll order a sheet of Flexoid then.

                        #821931
                        duncan webster 1
                        Participant
                          @duncanwebster1

                          Phos bronze is not a good bearing material unless you use hardened shafts

                          #821935
                          JasonB
                          Moderator
                            @jasonb

                            A lot of people also say that brass is not a good bearing material but there must be 1000s of the stuart 10 series engines all running quite happily with extruded brass bearings.

                            In the context of a model beam engine that may get run a few times a year and probably under no load I doubt the material will make a lot of difference. I use Colphos 90 phosphor bronze for the bearings on most of my smaller engines as it machines quite nicely and they all seem fine and run upto 3000rpm with unhardened shaft so a 60rpm beam engine won’t hurt.

                            #821947
                            StewA
                            Participant
                              @stewa

                              <p style=”text-align: left;”>I’ve a nice piece of bronze, not sure what grade, I’ll use. As been mentioned it will probably not get a lot of use.</p>

                              #821996
                              duncan webster 1
                              Participant
                                @duncanwebster1

                                Colphos is leaded, I was referring to the unleaded, which can be a pig to drill holes in. I would agree that Colphos is wonderful stuff

                              Viewing 14 posts - 1 through 14 (of 14 total)
                              • Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

                              Latest Replies

                              Home Forums General Questions Topics

                              Viewing 25 topics - 1 through 25 (of 25 total)
                              Viewing 25 topics - 1 through 25 (of 25 total)

                              View full reply list.