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Thread: Double acting Double cylinder Oscillator

  1. #71
    Join Date
    Jan 2010
    Location
    Kansas City area
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    5,467

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    I would suggest an 1/8" sheet of Delrin pinned in place rather than bronze or cast iron. The Delrin (or Acetal) won't wear the Aluminum, and the Aluminum won't wear the Delrin. The Delrin will slide freely enough that you can have a fairly tight joint that will still move easily.

  2. #72
    Join Date
    Mar 2008
    Location
    Barrie, Ontario, Canada
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    8,803

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    See post #70 for video of engine running.---Brian
    Brian Rupnow

  3. #73
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    Jan 2010
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    Kansas City area
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    Very nice! The video was put on while I was typing. Looks good.

  4. #74
    Join Date
    Mar 2008
    Location
    Barrie, Ontario, Canada
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    After 3/4 of an hour running, 80% of the stiffness is gone. Any residual friction is easily overcome by the power of the engine. I thought it would be like that, but I'm never sure until I've run a new engine for a while.
    Brian Rupnow

  5. #75
    Join Date
    Aug 2015
    Location
    Regina,Sask
    Posts
    75

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    A really nice little engine, Brian. I have enjoyed your build.
    Glenn Bird

  6. #76
    Join Date
    Jan 2015
    Location
    South Central Louisiana USA
    Posts
    16

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    Great job! I might have to build one of those before too long. Thanks

  7. #77
    Join Date
    Dec 2015
    Location
    Chilliwack, BC, Canada
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    4,075

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    It looks and sounds great Brian. I'm going to bet it has a really nice beat to it once you can slow it down a bit too.

  8. #78
    Join Date
    Nov 2011
    Posts
    1,207

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    A fine running engine. Sounds just like a tin lizzy. I still want to see you paint one just like the cad drawing.

  9. #79
    Join Date
    Mar 2008
    Location
    Barrie, Ontario, Canada
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    As promised, here is the final video of the double cylinder oscillating engine. Please note that I misspoke in the voice-over and said it has a 2 3/4" stroke. That was wrong.--It has a 1 3/4" stroke.---Brian
    https://www.youtube.com/watch?v=1id_...ature=youtu.be
    Brian Rupnow

  10. #80
    Join Date
    Mar 2008
    Location
    Barrie, Ontario, Canada
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    8,803

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    Is there a "tried and true" method of making a simple air reversing valve. On my current engine I have two "out" ports which the exhaust comes out of, and two "in" ports where the air pressure goes in. My intake manifold feeds air to the top two ports and allows the bottom two ports to exhaust to atmosphere. I was laying in bed last night thinking about a "reversing handle" on the manifold which would allow me to reverse the engine direction. I have it designed in my head, but it is a bit crude. If a current design exists for this, I would happily copy it.
    Brian Rupnow

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