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Motion problem

Home › Forums › Help and Assistance! (Offered or Wanted) › Motion problem

Viewing 6 posts - 1 through 6 (of 6 total)
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  • 11 January 2017 at 12:21 #277109
    David Bothwell 1
    Participant
      @davidbothwell1

      Working on a three and a half inch gauge 0-6-0 "Molly" I bought part built. When I acquired it it was running in both directions but there were no connnecting rods fitted. I have now fitted these. The engine ran OK as I was very careful measuring for the holes (they were laser cut rods) however after a few runs the eccentrics were found to have moved and were loose. So I drilled and pinnned these. Since then the engine will only run in reverse!? I also noticed when I first (acquired) ran the engine the reverse lever seems to be the "wrong way round" i.e. when pushed into forward the engine runs in reverse. Any suggestions gratefully received. I should add the right hand eccentric (viewed from the back of the engine) is 90 degrees in advance of the left.

      11 January 2017 at 12:21 #32873
      David Bothwell 1
      Participant
        @davidbothwell1

        No motion in forward gear

        11 January 2017 at 12:34 #277113
        JasonB
        Moderator
          @jasonb

          Sounds like one or more got pinned in the wrong place, How are the eccentrics positioned in relation to the crankpins, they should lead by 90degrees and a bit more so say 100deg to start with

          11 January 2017 at 13:36 #277122
          David Bothwell 1
          Participant
            @davidbothwell1

            I never altered any settings of the eccentrics, so I assume they are in the same position as when the engine arrived, but having said that something is definately amiss!

            11 January 2017 at 17:26 #277143
            Chris Gunn
            Participant
              @chrisgunn36534

              David, could you have reversed the eccentric rods to connect to the wrong ends of the expansion links?

              Chris Gunn

              11 January 2017 at 19:53 #277165
              David Bothwell 1
              Participant
                @davidbothwell1

                Hello Chris. many thanks fir your input, I thkink you may be right, unfotunately I would have to drill out the pins I have inserted to put it right. Am I right in thinking you mean to turn the eccentrics180 degrees? On the drawings I am sure it said right hand eccntric leading the left by 90 degrees(whis is now where they are), but will check thisin the morning

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