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  1. #1
    Join Date
    May 2009
    Location
    Cherrybrook
    Posts
    6

    Default Casting 'Pewter'

    Hi all
    I've made some moulds suitable for casting a low temperature tin/copper alloy. The problem is that the casting has a raised section at the top due to the surface tension of the alloy (similar in appearance to the old mercury thermometer). I want the alloy to be flat at the top of the casting. Any suggestions apart from filing the surface?
    Cheers
    Foccacia

  2. #2
    Join Date
    Oct 2006
    Location
    Tallahassee FL USA
    Age
    82
    Posts
    372

    Default

    If the shape permits (hint: post a picture of your pattern), I would use a two-part mold to include the top surface as confined. Set the top surface sloping upward toward a riser. After casting, cut off the riser.

    Depending on the shape (hint: post a picture of your pattern), a different orientation might work better, with the riser elsewhere.

    Cheers,
    Joe
    Of course truth is stranger than fiction.
    Fiction has to make sense. - Mark Twain

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