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Thread: casting parts

  1. #1
    Maximum Bitrate GoHybrid's Avatar
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    casting parts

    i've found only one or two threads on here that actually talk about casting replica parts with a silicone mold... but one thing i find missing from the thread is a discussion on de-airing the silicones and resins prior to pouring. Is there a magic technique out there to accomplish this so i don't get parts that look like sponges?
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  2. #2
    FLAC
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    You can either put a little vibrator in the silicone like they do with concrete or you can stick the silicon into a vacuum bell to suck all the air out.

  3. #3
    Maximum Bitrate GoHybrid's Avatar
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    what kind of vacuum do i need to pull... (gf is using vibrator at the moment.... j/k)
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    Maximum Bitrate seanz0rz's Avatar
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    Quote Originally Posted by GoHybrid View Post
    what kind of vacuum do i need to pull... (gf is using vibrator at the moment.... j/k)
    i like this guy...

    my only casting experience has been with Al, so i might not be much help.

    doing molds out of plaster of paris, to get the air bubbles out (they explode hot metal all over you at about 1300 degrees F) i put it on top of 3 aquarium air pumps (the big double air supply ones) it vibrated it just enough to make it a little more solid. a real vibrator will work better, but this is all i had, and had decent results with it.

    just an FYI, incase you happen to have 3 huge aquarium air supplies sitting around...
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    Maximum Bitrate GoHybrid's Avatar
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    i wonder what the viscosity of molten aluminum is compared to pre-cured silicone...

    anyway... that answers my question... so lets turn it into a general casting thread:

    what experiences can we share about the actual cast part... materials... successes, failures?

    currently I'm setting up to make a radio trim bezel out of some neat stuff i found called Alumilite. Not aluminum at all as the name suggests but it does appear to be a decent polyurethane.

    my current issue is the trim piece for my radio gets so thin in certain parts that if it's not a brand new, never-been-removed part it just warps and refuses to stay in shape. That's why I'm looking for tougher stuff to cast with.
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  6. #6
    Maximum Bitrate DeltaFX's Avatar
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    About aluminium casting : http://www.buildyouridea.com/index.html
    Now Galileo is real. Muhahahahaha :p

  7. #7
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by Shadow View Post
    You can either put a little vibrator in the silicone like they do with concrete or you can stick the silicon into a vacuum bell to suck all the air out.
    you need a lot of vacuum to be affective. usually this isn't something that you can make out of common household devices (i.e. shop vac) I believe you can buy a device that can create a vacuum by using an air compressor but I'm not sure how much this costs or how it works
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  8. #8
    Maximum Bitrate GoHybrid's Avatar
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    is it possible that vibrating can actually trap air in a mixture?

    also... i've got a vacuum pump that i used for laminating and it can pull in the neighborhood of 20 inHg... will that do it or am i going to need to spring for the bigger better one that does 29?
    Et ipsa scientia potestas est.

    Worklog for my 2007 Civic Si ...f*** it...
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  9. #9
    FLAC
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    20 inches should do well. You need to find a vacuum bell jar though.

  10. #10
    Maximum Bitrate seanz0rz's Avatar
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    if you vibrate so much as to break the surface tention of the thing you are vibrating, IE vib. it so much that it starts to slosh over itself, then yes.

    im going to try to stay away from physics here.

    if the vibrator you use is more of a hum, like electric hair clippers, then youd be fine.

    if its like what your girl uses, then maybe not so much. i dont know how rough she likes it.... but i would stick with something that vibrates very fast, with low impact (does this make any sense?)

    Quote Originally Posted by DeltaFX View Post
    About aluminium casting : http://www.buildyouridea.com/index.html
    known about that for a long time. i havent done any Al casting in a while(havent had time, been too hot, too wet, or too cold to do it when ive had time). but now that i have my new vehicle, ill probably be doing more of it in the near future. its quite interesting!
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