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Thread: Small Boiler

  1. #21
    Supporting Member editor@glue-it.com's Avatar
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    editor@glue-it.com's Tools
    I've literally been back to the drawing board for the miniature traction engine to work out the detailed design of the next few parts.

    Small Boiler-back-drawing-board-002.jpg

    The firebox is a challenge, but feels like I have a reasonable way forward.

    The engine feels a bit more tricky, plan was to create a bracket on the boiler that is brazed in place and the cylinder bolts to it, just not sure if I should use brass for this due to corrosion?

  2. #22
    Supporting Member thehomeengineer's Avatar
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    thehomeengineer's Tools
    Hi
    I have added a link to my boiler I made to L.C. Masons design which might help. If you plan on steaming I would try and keep to a all copper construction and the boiler bushes made from bronze. I made the stays from copper.
    Practical Engineering
    Practical Engineering
    Practical Engineering
    The Home Engineer

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    editor@glue-it.com (06-09-2020)

  4. #23
    Supporting Member editor@glue-it.com's Avatar
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    editor@glue-it.com's Tools
    Hi Home Engineer, great website and lots of information. Will have to have another look at the cylinder block and mounting to the boiler. My issue is the scale 12mm bore and stroke. Boiler is 1.75" in diameter and so quite hard to make exactly scale, but might have a go. Must admit that I hadn't realised that the bolts go through the boiler shell for the cylinder mounting. Thanks, Nigel

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    editor@glue-it.com's Tools
    Just been trying to pull together reference material around dezincification of brass and to get a summary together, basically use Phosphor Bronze for all bushes and boiler fittings.

    Conditions that can make leaching worse are:
    1. Slightly acidic or slightly alkaline water
    2. High levels of chlorine in the water
    3. More than 15% zinc in the brass alloy
    4. Low flow rates and low levels of aeration
    5. Relatively high tube wall temperatures

    The general consensus being "why did you even ask about using brass fittings"

  6. #25
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    editor@glue-it.com's Tools
    I had some real fun machining the hole through the firebox on the rotary table. It was all setup after doing the outside edge and just thought why not??

    Small Boiler-20200830_155619.jpg

    As you can see in the next image, the intention is that the boiler is a simple cylinder and the end sits in the firebox. The boiler has 7 flues for the hot gases to flow through to the smokebox.

    Small Boiler-20200830_160215.jpg

    I have a few videos of the machining processes

  7. #26
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    editor@glue-it.com's Tools
    I silver soldered the mild steel boiler together

    Small Boiler-burrell-firebox-07.jpg

    and then cleaned it up

    Small Boiler-burrell-firebox-10.jpg

    Quite a lot to do though still on the miniature traction engine.


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