Making Curves - is this one way?

Discussion in 'Fiberglass and Composite Boat Building' started by kach22i, Aug 9, 2007.

  1. SamSam
    Joined: Feb 2005
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    Location: Coastal Georgia

    SamSam Senior Member

    I like the tee-shirt idea.
    It kind of looks like you glassed over the shirt without taking it off some big mama to begin with. ;)
     
  2. boonbeest
    Joined: May 2008
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    Location: Belgium

    boonbeest Junior Member

    yeah but its very easy and
    ok it is a car

    but it's just for the explanation

    some guy's give tips without pictures

    its sometimes difficult to understand .

    so i give pictures.

    and yes with a car.


    but the T-shirt thing works

    easyer and more proper than foam and stuff like that.

    wright or wrong?

    grtz
    BB
     
  3. DanishBagger
    Joined: Feb 2006
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    DanishBagger Never Again

    Boon, I don't mind you using your car as an example of your skills - as such, it's a great example. I'm just teasing you a little in a friendly way. If you were here I'd buy you a beer. Don't worry :)
     
  4. kach22i
    Joined: Feb 2005
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    Location: Michigan

    kach22i Architect

    1. Thanks for the method and pictures.

    2. Do you end up with cotton bonded to the fiberglass cloth?

    3. I think a cone would be hard to make using this method because of the wood ribbed form required.

    Thoughts?

    Comments?

    Answers?
     
  5. tinhorn
    Joined: Jan 2008
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    Location: Massachusetts South Shore.

    tinhorn Senior Member

    Seems a deep shape like a cone might be tough, but when you just need to transition between two surfaces - like the speaker mounts - it's a great method. I've added it to my bag of tricks!
     
  6. Knut Sand
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    Knut Sand Senior Member

    I too did fall for that idea from Boonbeest, I would not use cotton like that in areas where moisture or structural stress can be a problem, but as a shape... Nice. I suddenly understood why you asked for a framework for a boat (in another thread) :D

    Btw; For better strength; wouldn't it be better to use polyester cloth?
    I suddenly remembered a friend of mine, he used old curtains (polyester) for putting into the molds for RC operated model airplanes, unpainted they looked really silly, but he's a better pilot than most.
     
  7. boonbeest
    Joined: May 2008
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    Location: Belgium

    boonbeest Junior Member

    you can use polyester indeed.

    when you pulled up the cotton or poly cloth

    first hars it in.

    let it dry.

    so your cloth can"t fall in from the weight of your glassfiber.

    when it is hard it can carry some with.

    o yeah sorry for my bad english.

    i'm from belgium

    grtz
    BB
     
  8. boonbeest
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    boonbeest Junior Member

    a cone is simple

    make 2 wooden rings

    a big one
    and a small one

    then you make a standard.

    when you centered the standard into the middel you can pull over the cloth

    like this

    [​IMG]

    cloth is bleu

    standard black

    wooden rings grey
     
  9. the1much
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    the1much hippie dreams

    we used to do that boon,,with styrofoam,,but we would have more rings,,start with ya big ring,thow in ya stro, however thick,then a smaller ring,,and so on,,with a center hole in each ring ( and the stryo. didnt matter as long as the stryo "went past" the rings),,,then hand shape it using whatever we had for grinders scrapers,or sanders,,,,till we got close,,,then it was all by hand.
     
  10. boonbeest
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    Location: Belgium

    boonbeest Junior Member

    yes true

    but with a cotton cloth or something

    you don't have the dirt and dust from the foam and stuff

    grtz
    BB
     
  11. boonbeest
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    boonbeest Junior Member

    yes but when you use styro

    and then you're going to polyester it

    the styro will get melted no ?


    wit PUR foam you don"t have that
     
  12. the1much
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    the1much hippie dreams

    ya it will melt,,,,unless you put wax paper, aluminum foil,,plastic,,or whatever to keep the resin from touching the foam.
     
  13. SamSam
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    SamSam Senior Member

    I made a banjo case once using a styrofoam form covered in duct tape. As the resin set, the case started losing it's shape. It ended up still being usable, but when I cut it open all that remained of the styrofoam was a condensed piece about the size of a golfball.
     
  14. the1much
    Joined: Jul 2007
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    the1much hippie dreams

    you need to use a closed cell stryo,, made for marine use,,,but i've used packing foam,,you just need to be careful how "hot" ya mix ya resin, when using the cheap stuff,,hehe ;)
    but they say when using epoxy the wax paper melts,,so should be foil , or heavy duty plastic.
     

  15. kach22i
    Joined: Feb 2005
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    kach22i Architect

    Blue or Pink extruded polystyrene (closed cell) rigid insulation and West Systems.

    Do not use the cheap Bondo brand, it's terrible and will melt everything.

    I love the West Systems "pump" method..................great invention.
     
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