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  1. #1
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    53
    Posts
    1,003

    Default First furnace build

    Made a start on my first furnace on the weekend. I'm going with the design from the book "The Artful Bodgers Iron Casting Waste Oil Furnace".
    Why that particular one? I managed to get hold of the book, it makes sense, and seems relatively simple while still being practical and sufficient to melt cast iron should I want/need to do that in the future.
    For a start it will just be aluminium and probably some brass/bronze.

    For those not familiar with the design, its a castable refractory inner cylinder surrounded by insulation (I'll be using ceramic blanket), foot lifted lid and the ability to melt directly in the furnace for breaking down large bits of scrap. Powered by an simple preheater type of oil burner.
    Inner diameter is 250mm and the outside roughly around 400.

    I was going to start with an old beer keg as the author had done, but stainless is a hassle to work with, and I remembered I had an old gas hot water service in the scrap pile. It was working OK but got swapped out for a larger unit at our old place as the ladies of the house demanded more hot water!!

    So, out with the Aldi plasma cutter and made a start....






    Steve

  2. #2
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    53
    Posts
    1,003

    Default

    Got the outer skin cut to length and cleaned up the cuts on both that and the lid.




    Steve

  3. #3
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    53
    Posts
    1,003

    Default First furnace build

    The water heater cylinder was about 380mm diameter and I really wanted a bit larger for the furnace outside to get a reasonable thickness of refractory without making the inside opening too small.
    So out with the plasma cutter to make vertical cut and inserted some 40x3mm flat (in 3 places).




    The opposite applied for the inner to contain the refractory. I cut another piece the same length off the cylinder and then removed a piece from the side so I could squeeze it up and make it smaller. When I squeezed it up I found that the original factory weld had softened the material and it wanted to bend there rather than staying nice and round. I'll weld it up and then find some way of massaging it a bit more round - although its mainly an outer former for the refractory so definitely not critical.



    Steve

  4. #4
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    68
    Posts
    4,646

    Default

    Looking forward to see the furnace in action. I could do with something like that myself for melting down scrap metals.
    Kryn
    To grow old is mandatory, growing up is optional.

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