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#21
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Richard Lamb wrote:
Blueskies wrote: Yes, I guess that would be a big piece of glass (don't take anything out of context here!). Do the plans/instructions have any other suggested way to lay up the panels? As far as bending the finished panels, a two layer lay-up will be quite flexible, even fully cured, and as long as you don't have to wrap around the LE I'm sure you will not have any problems with cracking. Have you looked at the http://www.westsystem.com/ site? Good stuff... -- Dan D. . I've been told that West does indeed make a laminating resin, but this isn't it. West 105/205 is absolute best stuff I've ever used - on wood. It will probably be great on wood/foam structures. But it's not what I ever use (again) for laminating glass fabrics. I used to use Dow 330 / 147(?) but my source quit carrying it (because I was the only one buying it?) My impression is that resins like 330 that don't use MDA (Methyl Diethel Amines???) share a common "problem". At low temperatures they tend to "separate out". The resin has an odd lumpy look on the surface and there will be a lump of soft rock candy in the center. It is real simple to correct by immersing the resin container in hot water for a while. When the soup is clear again, it's ready to use. But if the resin is at all "crystallized", it won't completely set - ever. It even says so in the directions! For those who read such things... Got AeroPoxy(?) last resupply to make a new cowling for Leo's Super Zodiac. I've used it before, no complaints (other than the MDA toxicity?). So, what is it that you are building? Richard Dyke Delta JD-2. http://www.ernest.isa-geek.org for the whole story. The skins, turtleback and cowling are all fiberglass. Some builders have also glassed the belly, tailfin and control surfaces (plans call for fabric there). -- http://www.ernest.isa-geek.org/ "Ignorance is mankinds normal state, alleviated by information and experience." Veeduber |
#22
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Blueskies wrote:
Yes, I guess that would be a big piece of glass (don't take anything out of context here!). Do the plans/instructions have any other suggested way to lay up the panels? The directions say to lay it up on a couple pieces of MDF laid side-to-side, with a piece of tape down the center. I have to cut forms for the stainless steel ribs, so I thought an improvement on this technique might be to use the forms to shape the MDF so that the resulting layup is nearly the correct shape already. Very little bending==very little built up stress. The biggest improvement would be not to have to make the skins at all. I've looked at G-10 and FR4, and have found several manufactures with lots of data sheets. Reading them, I keep hearing that eerie refrain, "You are in a maze of rooms, all slightly different..." As far as bending the finished panels, a two layer lay-up will be quite flexible, even fully cured, and as long as you don't have to wrap around the LE I'm sure you will not have any problems with cracking. Have you looked at the http://www.westsystem.com/ site? Good stuff... Looked there. Good stuff...IF you're building a boat, or a trailer, or a chair. Goes back to what I said before. Every manufacturers claim that what they have is good for whatever you're doing. While that just may be true, but I don't trust it to be, and it is so much unfamiliar territory that I just keep getting lost. What I need is a map to help seperate the hype from the information. -- http://www.ernest.isa-geek.org/ "Ignorance is mankinds normal state, alleviated by information and experience." Veeduber |
#23
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Ernest Christley wrote:
Richard Lamb wrote: Blueskies wrote: Yes, I guess that would be a big piece of glass (don't take anything out of context here!). Do the plans/instructions have any other suggested way to lay up the panels? As far as bending the finished panels, a two layer lay-up will be quite flexible, even fully cured, and as long as you don't have to wrap around the LE I'm sure you will not have any problems with cracking. Have you looked at the http://www.westsystem.com/ site? Good stuff... -- Dan D. . I've been told that West does indeed make a laminating resin, but this isn't it. West 105/205 is absolute best stuff I've ever used - on wood. It will probably be great on wood/foam structures. But it's not what I ever use (again) for laminating glass fabrics. I used to use Dow 330 / 147(?) but my source quit carrying it (because I was the only one buying it?) My impression is that resins like 330 that don't use MDA (Methyl Diethel Amines???) share a common "problem". At low temperatures they tend to "separate out". The resin has an odd lumpy look on the surface and there will be a lump of soft rock candy in the center. It is real simple to correct by immersing the resin container in hot water for a while. When the soup is clear again, it's ready to use. But if the resin is at all "crystallized", it won't completely set - ever. It even says so in the directions! For those who read such things... Got AeroPoxy(?) last resupply to make a new cowling for Leo's Super Zodiac. I've used it before, no complaints (other than the MDA toxicity?). So, what is it that you are building? Richard Dyke Delta JD-2. http://www.ernest.isa-geek.org for the whole story. The skins, turtleback and cowling are all fiberglass. Some builders have also glassed the belly, tailfin and control surfaces (plans call for fabric there). -- http://www.ernest.isa-geek.org/ "Ignorance is mankinds normal state, alleviated by information and experience." Veeduber I remember now, Earnie. Sorry. What you really need is a store window that you can make up some flat glass panel stock on. I've never done one that size before, but I've laid up light flat stock on the glass patio door... Advice? CLEAN it first! Sterile is good. Then spray a coat of PVA, and slap it up there. I used a 5 mill plastic cover over the wet fiberglass, and a piece of plywood for a pressure plate Vacuum would work better, of course, but I couldn't hook the TV up to the glass door (TV sucks, doesn't it!) So what did Dyke recommend? Richard |
#24
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Richard Lamb wrote:
So what did Dyke recommend? Richard He's at Sun'n'Fun. Waiting for him to check back in to our email list. I do like the store glass window idea, though. I have an uncle who 'collects' that sort of thing. Time to investigate. -- http://www.ernest.isa-geek.org/ "Ignorance is mankinds normal state, alleviated by information and experience." Veeduber |
#25
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Big piece of glass...again!
-- Dan D. .. "Ernest Christley" wrote in message . .. Richard Lamb wrote: So what did Dyke recommend? Richard He's at Sun'n'Fun. Waiting for him to check back in to our email list. I do like the store glass window idea, though. I have an uncle who 'collects' that sort of thing. Time to investigate. -- http://www.ernest.isa-geek.org/ "Ignorance is mankinds normal state, alleviated by information and experience." Veeduber |
#26
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Blueskies wrote:
Big piece of glass...again! Just to pass on a nugget I found....here's some excellent information on what all of those strange words surround epoxy means. I only had a couple semesters of college chemistry and I understood most of it (I think), so you guys shouldn't have any problem. http://www.epoxyproducts.com/25points4u.html -- http://www.ernest.isa-geek.org/ "Ignorance is mankinds normal state, alleviated by information and experience." Veeduber |
#27
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Ernest Christley wrote:
Blueskies wrote: Big piece of glass...again! Just to pass on a nugget I found....here's some excellent information on what all of those strange words surround epoxy means. I only had a couple semesters of college chemistry and I understood most of it (I think), so you guys shouldn't have any problem. http://www.epoxyproducts.com/25points4u.html -- http://www.ernest.isa-geek.org/ "Ignorance is mankinds normal state, alleviated by information and experience." Veeduber Nice on, Earnest. There is a lot more too... http://www.epoxyproducts.com/map.html |
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