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Triple expansion set of plans

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Triple expansion set of plans

Home › Forums › Beginners questions › Triple expansion set of plans

Viewing 5 posts - 1 through 5 (of 5 total)
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  • 27 January 2011 at 08:11 #63156
    Olivier LAVIE
    Participant
      @olivierlavie63814
      Good morning,
       
      I’ve received the set of plans for the triple expansion engine M1 (O.B BOLTON) and a quick glance on sheet n° 2 lets appear some errors between the crankshaft dimensions (7/16″ diam) and the main bearing brasses (3/8″ diam) and some others (excentric sheaves…). Did not look at the other sheets yet.
       
      Can you confirm i’m right before changing my glasses.
       
      Thanks for your replies.
       
      Regards
       
      Olivier
      ++
      27 January 2011 at 08:11 #5378
      Olivier LAVIE
      Participant
        @olivierlavie63814
        27 January 2011 at 17:03 #63176
        mick
        Participant
          @mick65121
          I recently finished this engine, after a couple of years on and off. I made it complete from stock material and can’t remember having any issues with the drawings. I know in some cases I did scale a few components. The drawings I worked from were spot on scale, so it was dead easy to check component size. In industary scaling from drawings isn’t incouraged, but in this case I can see no harm, as you will be making all the mating parts, any adjustment can be made as you go along. Think you’ll have fun, as some of the machining is interesting.
          28 January 2011 at 16:50 #63210
          mick
          Participant
            @mick65121
            Hi. Its me again! I looked at the plans today and I see what you mean. I don’t have the build notes that go with the drawings, the only thing I can think of is that its a turning allowance, so the journels can be turned to finished size after fabrication. I fabricated my crankshaft using 0.375” sliver steel, but I did spend a lot of time making sure that every part of the crank shaft assembly was spot on size and set all the cranks at their correct angles by setting them out on the machine table against 60 degree set pieces, before finial pining. Its quite a large throw to machine, so fabricating might be the better option.
            28 January 2011 at 17:53 #63211
            Olivier LAVIE
            Participant
              @olivierlavie63814
              Hi Mick,
               
              Many thanks for the replies.
               
              I’ll not start the fabrication in the next days but i like to study every thing to make sure i all understand.
               
              I’ve ordered the E.M magazines on this engine (vol 155-157). I’ll see what they suggest for the crankshaft fabrication.
               
              Regards
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