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 Posted 11/30/2004 7:32:17 PM |
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| ok fiberglass choper 1 time few, most time u use vaccume tech u have to replace the bag ech time if u go wtih a cheap bag which u can do and it works ok. with the batmobile it will take u awhile to get the bag made up. so each time ur doing this ur making the bog and setting everythign up and as u know the batmobile is big, so it takes time, and cost of the bag almost each time, fiberglass chopper u just sprey ur mold witha relase and sprey ur mold with the choper and let it sit. now it may be ture at a bigger scalse u may save more resin, but it has been my exarance on smaller skills that just useing the chopper to sprey a mold turned out to be more cost effecint on the small scales, so natural i would think it would be a pretty penny to do on the bigger scales, proof of this i have none. but setting up the bags each time vs just spreying the mold is a less work.
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| Posted 11/30/2004 8:01:56 PM |
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First, it's not really a bag. It's just a piece of plastic sheeting (visqueen)which is cheap. You can make reuseable bags but you'd only want to go to that much trouble and expense if you were making multiple parts. The quality of the finished part is not necesarily any better though.
Second, the work it takes to set everything up dry is much neater and easier than traditional hand lay-up. True a chopper gun will make this easier, but generally this is considered inferior in quality to hand lay-up.
Third, VI makes it possible for one person to lay-up large parts since your not racing the clock to get done before the resin starts to gel.
I have a bunch of pictures of this process and I think I will put up a page on my website tonight or tomorrow.
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| Posted 11/30/2004 8:37:03 PM |
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| "True a chopper gun will make this easier, but generally this is considered inferior in quality to hand lay-up. " not sure if i read this right but i if did a choper is actuly better qualty then a hand lay out. the diffrence between a chopper and the vaccume is with vaccume u do use less resin, and ur parts are more compressed. but as i siad setting up vaccume parts in small size is easyer then bigger scales. if u havent doen this method befor its really hard to understand what im saying about it, this method would work easly for ur go cart project, but on the scale where tthe object is around 20 feet long it gets tricker. if ur gonna sue this on ur gocart which i would suggest youll see what i mean.
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| Posted 12/1/2004 1:53:39 AM |
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Back in October I was down in Miami for IBEX, (International Boat Builders' Exibition & Conference)and attended a vacuum infusion demonstration. It was pretty amazing to watch a guy and a girl (mostly just the girl)lay-up a small boat in there nice clothes and shoes right there on the sidewalk of the Miami Beach Convention Center! Anyway, I took a bunch of pictures and wrote out a quick description of the process. Here is the link:
Vacuum Infusion Demo
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| Posted 12/1/2004 2:36:16 AM |
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That is super cool. I added the link to my site Tim. 
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| Posted 12/1/2004 2:42:27 AM |
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| ok apprently theres 2 diffrent ways to do vacuum infusion, that way would be cheaper then the way i do with smaller parts and the way my firend does his kit cars. i would have to agree now that that way is rather simple.
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| Posted 12/2/2004 7:41:58 PM |
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| So what were you talking about? I'm guessing now that you meant vacuum bagging, instead of vacuum infusion.
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| Posted 12/2/2004 10:07:41 PM |
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| pretty much a form of vacuum baggin.
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