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Thread: Worklog: Fiberglass sub box's

  1. #21
    Maximum Bitrate Dennis5587's Avatar
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    ok... so what did you end up fiberglassing on top of? the fleece? or did that fall through completely?

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  2. #22
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    Quote Originally Posted by Shadow View Post
    Spandex is mostly lycra which is damn near liquid resistant which makes it horrible for soaking up resin. One layer of fleece is as strong as 3 layers of mat.

    I used a wool moving blanket for an enclosure once. I could drive over the mold with a car it was so strong
    Your pretty damn ill informed eh?

    You don't rely on resin soaked fleece for strength. You rely on fiberglass for strength. You rely on your base layer only to give you a base shape on which to fiberglass. You don't rely on 1 layer of fleece to withstand the pressure of a sealed subwoofer box, do you?

    Hell take a quess at what fabric was used by the alpines demo car? You know people certified in composite fabrication did it, so I'm sure they used the right material right?

    Yup you guessed it.

    poly cotton blend fabric aka spandex

    Hell look at the curves I got with my dash and prove to me you'd be able to get that same detail using some of your average wal mart fleece that absorbs a whole can of resin and ends up giving you a false impression of strength.

    Hell, I'll let the pictures speak for themselves.





    Figure it out yet? You want something that absorbs as little resin as possible while giving you a strong enough base to lay fiberglass on. Spandex does that perfectly, and allows you to conform to incredibly tight curves, as well as allowing you to use fiberglass to build strength. NOT RESIN.

    You'll learn sooner or later though...

  3. #23
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    Quote Originally Posted by SexySamSam View Post
    Pkay, so we tryed to coat the fleece in resin but the elmers glue can suck my dick, it all came off so we then went to matt. We weren't allowed to do it in the garage because his mom said it smelled. It was a little to cold and the gravity took over before it could cure. We put a heat lamp in there and the first layer turn out ok. We are going to finish the inner shell tomorrow.
    if it's as cold as I think it is up there, you shouldn't be glassing anyways, your end result won't be worth a damn.

    Fiberglass needs to be laid within a certain temperature window, too hot and it will end up brittle, too cold and it will be weak.
    Jan Bennett
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  4. #24
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    I was under the impression that the Alpine guys used grill cloth on their stuff...then they go back and use 5-6 layers of .5 oz mat to give it their strength.

    There's no right or wrong way to do all of this, there's a few right and wrong ways.

    For instance, we use carpet for sub enclosures to give us a base. If we were to use spandex it wouldn't be strong enough to hold a single layer of mat over the vast expanses of area we have. The carpet, once we applied resin and let it kick, was stronger over the expanse and didn't sag like spandex would have.

    Just an instance of where one right in one area isn't right in another.

    For intricate shapes, spandex would work great, for vast expanses, not so much.

    btw - strong and brittle in this instance are two things to remember.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  5. #25
    FLAC
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    Your pretty damn ill informed eh?
    You're pretty damned ill informed to make that assumption. Did you look at my box buildup at all? I have 1 layer of fiberglass cloth, 2 layers of Mat and a layer of fleece. I can get any shape you can with spandex using fleece. The fleece will also be much stronger than the spandex.

    fiberglass to build strength. NOT RESIN.

    You'll learn sooner or later though...
    There's nothing too special about the fiberglass cloths or mats that makes them different from any other fibrous material. The resin helps to adhere the layers of fiber to one another making them stronger. I guess my 10+ years of experience in fabrication isn't enough experience to know what does and doesn't work.

  6. #26
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    Fiberglass weave WILL be stronger than carpet with resin applied.

    Carpet with resin will be very brittle.

    A woven cloth will be stronger in the direction of the longer strands.

    Carpet doesn't have a long fiber length when compared to many of the mats and sheet fiber glass out there.

    Fiber glass is strong, but it is very brittle.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  7. #27
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    You rely on fiberglass for strength. You rely on your base layer only to give you a base shape on which to fiberglass.
    Exactly why I use pantyhose to get the shape and fiberglass over them. The glass is what gives the strength, and the pantyhouse gives the shape similar to what spandex would do.

  8. #28
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    The fleece just all fell off so we threw it out, the first layer went to hell. It's probly not as cold as you think it is here. Are one friend has a heated painting both that we are going to use to finish this up.
    Sam
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  9. #29
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    Quote Originally Posted by Shadow View Post
    You're pretty damned ill informed to make that assumption. Did you look at my box buildup at all? I have 1 layer of fiberglass cloth, 2 layers of Mat and a layer of fleece. I can get any shape you can with spandex using fleece. The fleece will also be much stronger than the spandex.



    There's nothing too special about the fiberglass cloths or mats that makes them different from any other fibrous material. The resin helps to adhere the layers of fiber to one another making them stronger. I guess my 10+ years of experience in fabrication isn't enough experience to know what does and doesn't work.
    Id hate to break it to you but you obviously didnt learn **** from your 10+ years of fabrication if you had to make a thread about some miracle adhesive which was nothing more than typical CA glue and kicker.

    Shows how much you learned...

    Don't even get me started on how wrong your subwoofer box is. I bet it flexes like crazy doesn't it?

    First off you've got a false impression of strength that the fleece is giving you. Fiberglass is used in the composites industry for a reason. You don't see them using fleece when building something since it's not nearly as strong as fiberglass. Not only that buy you say you have one layer of fiberglasswhich I'd assume to be your average 6 oz. E glass (Not your high strength S2 Glass). So to start with you have a layer of fiberglass 0.0093" thick, one layer of fleece, and 2 layers of matte glass and you expect that to hold the high pressures a sealed subwoofer enclosure needs to withstand? You've got to be kidding me if you say your box doesn't flex. For christs sake my dash was built stronger than your subwoofer enclosure, and it doesn't even need to withstand the pressures of a subwoofer enclosure.

    The fact is you messed up. YOu relied on fleece to give you a false impression of strength when in reality you have a very brittle substructure that your thin layer of fiberglass resides on. Now whenever you press on the thin fiberglass shell that rests on the fleece it will flex since you didn't build the fiberglass thick enough and it will eventually lead to failure of your substructure. As I've said before you don't want to use fleece exactly for that reason. It gives you a false sense of security and in the end leads you to believe that you box is strong when in fact your relying on an incredibly brittle (resin impregnated fleece) substructure. You DONT WANT THIS. You want as thin as possible of a substructure, and as many layers of FIBERGLASS to give you your needed strength. If you go about using different materials other than those proven in composites (eg kevlar, carbon fiber, fiberglass) you'll end up with something to brittle.

    Oh well, live on with a flexing box, and your sheer excitement of superglue. I know I won't be the one repairing things that are ruined from fatigue in a year...

  10. #30
    FLAC
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    Dude. Calm down.

    I can jump on my box and it doesn't flex. Go read my thread before you start bashing me. I put down a layer of cloth, then two layers of mat and then the fleece. There are THOUSANDS of fabricators who use fleece daily. Your spandex recommendation is no different than my fleece recommendation. Jan's grille cloth recommendation is no different than my fleece recommendation.

    matte glass
    The glass has a dull finish?

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