Replicating vacu-formed parts - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-04-2006, 04:38 PM   #11
Mike Emilio
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Vulcan1 (John) wrote
"For glass parts I cover with epoxy or polyester at least 1/8" thick and make it in 2 pieces for taking it apart. It is very hard to get a part out if it is any size without wrecking something. "

You must be doing something wrong. Possibly not enough draft angle.
I've never experience any part that didn't release very very easily, quite effortless.

Here's a picture of my 1/3 scale Mustang canopies. Perfect and flawless!
Those canopies are about 13" high and almost 3 feet long! You can see that they are as big as the dinning room table.
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Old 10-04-2006, 05:12 PM   #12
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You catch my attention !!

Please, give me a link or the business where you buy this stuff (tooling resin). I want to try it.

I usualy use Bondo putty and Duratec primer to make my plug for vacuforming. Work great but maybe the tooloing resin are better !
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Old 10-04-2006, 08:10 PM   #13
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I don't have a problem with the canopies but sometimes with the glass parts and it is the angles that are the problem. Most of the time I am lucky but once in a while I am not. Large cowls and fuselages I like to split.
I do not know if you have tried it for your molds but I like making mine heavy when making fuse parts. For filling I have been using polyester resin mixed with about 3/4's of the hardner so it does not set to fast. In a plastic bucket I mix fine sandblasting sand that I get from Princess Auto. I mix the sand with the resin so it is wet with no dry spots and start filling. The problem with a large batch is the shrinkage if it is to thick. I make my mold with a plywood box around it and cover it about 1/2". Cheaper than going with the bondo and when it is upright easy to work with as it does not move on the bench.
John Davidson
Keep the shiny side up and the wheels down
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Old 10-05-2006, 02:50 AM   #14
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Thanks for the help guys.

I have some resin that I could fill the parts with, so that covers that part of the problem. Now for the actual forming process; is there equipment that I can get relatively easily or build, or will I have to send the parts out. Any web links or places that anyone knows of around Vancouver that I can contact? I've checked a couple places, but they don't do this kind of thing.

I'm thinking that it might be easier to make some fibreglass molds. I've done a little of that before, so I could fight my way through it.

Anyone want Gee Bee parts when I fight my way through this? Hopefully I won't need them, just want to be able to rebuild my plane if I need to.

Thanks again!
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Old 10-05-2006, 10:40 AM   #15
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If you are making copies of the molded parts like cowl and things and if they are fairly stiff so they are not to flexible you can do it right over them. Just wax them and PVA. I like tacking my parts on a piece of arborite covered ply which is also waxed and pva'd. If you have uneven edges where the resin will flow into I use plasticine(kids) and smoothe it out filling the holes. Works good also on split parts where I imbed the part half way into the arborite for the seam line.
At one time I had resin with a higher vinale (spelling) content that made the the thinner molds more flexible. It wasn't much but made it easier to popout parts. Did not crack or go as brittle as the regular. Check at a shop that works with glass and to see if they have an additive. My source went out of business so have to look for another in the future.
If you are going to vaccuform parts you will need a setup. Mine is self contained and is 12"x24" but if you want larger you will have to talk to Mike. pm me if you want info on mine.
John Davidson
Keep the shiny side up and the wheels down
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