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    Casting a lead bulb keel
    by cenbeth ๐Ÿ‡ฌ๐Ÿ‡ง ( Chief Petty Officer 1st Class)
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    11 Posts 10 Replies 15 Photos 9 Likes
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    marky
    Lieutenant Commander
    ๐Ÿ“ Casting a lead bulb keel
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 7 hours ago
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    art shops usually stock graphite powder ,a company called Terranti are a Good stockist for modeling and casting materials ,another Good source of casting materials are dental lab suppliers ๐Ÿ‘
    cenbeth
    Chief Petty Officer 1st Class
    ๐Ÿ“ Casting a lead bulb keel
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 2 months ago
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    Useful information. I'm not sure where I'd get these powders from though. When I designed the plugs I avoided undercuts and had no need to use the mould more than once but if anybody did need to your advice seems more than sound.
    marky
    Lieutenant Commander
    ๐Ÿ“ Casting a lead bulb keel
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 7 hours ago
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    Sorry,should have said you can also use flint mixed into the plaster I used this when casting glass as well as bronze and aluminium.
    marky
    Lieutenant Commander
    ๐Ÿ“ Casting a lead bulb keel
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
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    If you are using a plaster mould when its dry coat the inside with graphite powder this will allow for easier removal and if there are no under cuts you may be able to use the mould 2 or 3 times ,when I used to cast bronze into plaster moulds (lost wax)we mixed the plaster with grog (milled ceramics dust)to give it more strength and heat resistance ๐Ÿ‘
    philcaretaker
    Chief Petty Officer 2nd Class
    ๐Ÿ“ Casting a lead bulb keel
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 10 hours ago
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    Cenbeth - great write up with picys, the process can be daunting when casting - I have tried 3 metods to produce a keel bulb - thought i would also share my experiences .
    (1.Casting 2.Shaping 3.Filling)

    1. Shape a wooden keel bulb and from it produced a concrete 1/2 mould (*leave concrete to cure/dry) then cast as two lead halves.

    2.Cut lead sheet profiles to diminishing templates, glue together and shape to bulb profile.

    3.Used 1/2 wooden keel mould to Vac form two plastic keel bulbs which can be filled with lead shot/or concrete - then stuck together.
    Mni tnx

    Phil
    3
    phil
    cenbeth
    Chief Petty Officer 1st Class
    ๐Ÿ“ Casting a lead bulb keel
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 2 months ago
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    Mine were left in the workshop for about a month, possibly longer, before being put in the oven for a couple of hours. The problem with the last casting was that the Plaster of Paris was too old.
    RNinMunich
    Fleet Admiral
    ๐Ÿ“ Casting a lead bulb keel
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    Country: ๐Ÿ‡ฉ๐Ÿ‡ช Germany
    Online: 5 hours ago
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    No need to be sorry Edward, she's a sight for sore eyes,๐Ÿ‘
    and British Racing Green to boot ๐Ÿ˜‹๐Ÿ˜‹
    Yours drooling, Doug๐Ÿ˜Ž
    Young at heart - slightly older in other places ๐Ÿ˜‰ Cheers Doug
    wunwinglo
    Petty Officer 2nd Class
    ๐Ÿ“ Casting a lead bulb keel
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 7 days ago
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    Your experiences with mould-making make for interesting reading. I have never used plaster for casting lead but I do have extensive knowledge of using surgical plaster to make female moulds for vac-forming polystyrene sheet. My moulds are far smaller than yours but I have found that they MUST be thoroughly dry or you have problems. As a result I dry moulds for up to a week on top of a radiator or the hot water tank. I test it by tapping with a small hammer. If I get a ceramic 'clink' like hitting a modern house brick, then it is good to go. With the sort of volume you have there, the drying could take much longer.
    1
    cenbeth
    Chief Petty Officer 1st Class
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 2 months ago
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    Hi,

    Iโ€™m sorry about the car. It got copied across accidentally.

    Best wishes

    Edward
    2
    Martin555
    Rear Admiral
    ๐Ÿ“ Casting a lead bulb keel
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 15 hours ago
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    Hi,
    It sounds like you had a lot of fun and a few changes of underwear.
    That is a big lump.
    I am glad you managed to achieve it and I bet you are too.
    Well done.

    Nice car.

    Martin555.
    If it looks right it probably is.
    Show 1 More Posts



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