This is gonna sound a little stupid...

  1. #1

    Member Since
    Mar 2008
    From
    Limerick, Ireland
    Posts
    261

    This is gonna sound a little stupid...

    ... but Ive been watching MythBusters at their vacuuform table again...

    They were doing a buck to pull a torso - thing is the buck was made out of FOAM??? Huh???

    Whats this precious? Can certain foam withstand heat/vacuuming? The MAIN thing that has been putting me off building a table and my LIFELONG dream of StormTrooper armor is I have no experience with woodwork for the bucks. Lots of enthusiasm - no experience!

    Interest peaked!

    Help!


  2. #2
    t_bone9600's Avatar
    Member Since
    Dec 2005
    From
    Jackson, Ohio
    Posts
    855

    Re: This is gonna sound a little stupid...

    I wondered the same thing. I'm anxious to see what kind of answers turn up.

  3. #3

    Member Since
    Mar 2008
    From
    Limerick, Ireland
    Posts
    261

    Re: This is gonna sound a little stupid...

    Cool!

    I thought I was just crazy Later in the series Im watching the guys make some stuff out of Roofing foam covered with fiberglass... they are cutting and shaping the foam like butter...

  4. #4
    BOBA PHAT's Avatar
    Member Since
    Mar 2002
    From
    Austin Texas
    Posts
    607

    Re: This is gonna sound a little stupid...

    I've seen that episode too. I guess it depends how hot the plastic has to get to make your pull. The melting point of 2 lb EPS foam is around 180 F.

    That roofing foam was probably urethane foam. It carves like a dream and can then be glasses, just like a surfboard. I've also used it sealed and sanded smooth as a plug for a mold.

    -Ryan

  5. #5

    Re: This is gonna sound a little stupid...

    All foam is NOT created equal.

    Polyurethane foam can be vac'd over. I do this all the time. 6# density is fine for this. 4# is OK if there is no sharp corners or detail.

    Do not confuse with EPS (expanded polystyrene) which will crush melt, and fuse to plastic.

  6. #6

    Member Since
    Mar 2008
    From
    Limerick, Ireland
    Posts
    261

    Re: This is gonna sound a little stupid...

    Thanks guys!

    Im stunned TBH on the shapability foam seems to give. Of course I'll have to do some research, the only type Ive even noticed locally is aeroboard which of course would be crushed by even a small vac.

    If its not imposing would you guys have a build, pics or links to find out more about this please?

    Thanks again - have a good weekend!

    Dave
    Last edited by mckenic; Oct 4, 2008 at 1:49 PM.

  7. #7

    Re: This is gonna sound a little stupid...

    I know someone who made a form out of insulation foam board, coated with a good layer of bondo, and vacced over it. Probably a good idea to use the vacced piece as a mold to make better plaster forms for repeated use.

  8. #8

    Member Since
    Mar 2008
    From
    Limerick, Ireland
    Posts
    261

    Re: This is gonna sound a little stupid...

    Sounds promising... cant find too mucb info locally as usual tho...

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