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Old Nov 14, 2015, 12:25 PM
jkap5t is offline
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Help!
Big Foam Block

I need helping finding where to order foam stock. I need high density foam that can be cut using hot wire cutting and can also be machined similar to the insulation sheets at Lowe's or Home Depot. For my wings I need sheets that are 2 inches thick. For the fuselage I need blocks that are at least 5 inches thick which I am having a very hard time finding.
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Old Nov 14, 2015, 01:51 PM
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You can laminate thinner sheets together with Elmer rubber cement to make thicker stock. Just paint it on both surfaces, let it completely dry, then press together. I've never had it come apart.
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Old Nov 14, 2015, 02:19 PM
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Try a building supplies, or insulation stockist for foam supplies.

I assume this is your Guillow Edge 540 Composite Build project, and for manufacturing plugs and molds.

If so, there is a very good RCGroups -- Composites Fabrication forum -- that may be of help.

Ray.
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Old Nov 14, 2015, 02:33 PM
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You might also look into billots made for docks. These are the old popcorn type foam but make good hotwire cut wings etc.
Mine are two by four ft. by 6 in. thick.
Try a marina or marina supplies source.

Gord.
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Old Nov 14, 2015, 03:58 PM
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I have used 3M 77 to laminate sheets together. I have a wing I did about 15 years ago in the garage and it has not come apart. The hot wire cut across the joint like it was not there.

out here we have a supply company call White Cap. They can order sheet in any thickness you want.

Buzz.
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Old Nov 14, 2015, 04:30 PM
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Foam blocks of even 3 Foot thickness are easily found at boating /dock building suppliers.
Local one has Monster sized Foat block things in stock. Lots of them.. each wrapped in blue cling film.
I suspect it's bead type foam though.
Will look closer next time I'm there.
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Old Nov 14, 2015, 11:06 PM
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Thank you for all the replies. This is actually a different project from my Edge build. It's a school project and will have close to a 6' span. The issue is that we need something machinable so the popcorn or bead style will not work. I've machined high density foam before with great results but nothing this thick. Also one of our criteria is manufacturability and laminating will have a big impact on this aspect so we definitely want to go with solid blocks that are already thick enough for what we need.

Unfortunately my Edge build will have to be put on pause for the next couple weeks while I work on this.
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Old Nov 15, 2015, 03:28 AM
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Dow Floormate (aka blue foam) is available in several densities and sheets of up to 150mm and 200mm thick. All you have to do is find a stockist. That will depend on where you live.

Steve
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Old Nov 16, 2015, 12:48 PM
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Quote:
Originally Posted by jkap5t View Post
Thank you for all the replies. This is actually a different project from my Edge build. It's a school project and will have close to a 6' span. The issue is that we need something machinable so the popcorn or bead style will not work. I've machined high density foam before with great results but nothing this thick. Also one of our criteria is manufacturability and laminating will have a big impact on this aspect so we definitely want to go with solid blocks that are already thick enough for what we need.

Unfortunately my Edge build will have to be put on pause for the next couple weeks while I work on this.
Because you have no location information in your profile, offering advice on where to obtain foam (or anything else for that matter) is pretty useless.

Tom
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Old Dec 16, 2015, 05:27 AM
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You can try XPS-Foam if you have it in your town.
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Old Dec 16, 2015, 06:16 AM
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builder supply places used to have really thick foam offerings

RCFoam.com has this
http://www.rcfoam.com/depron-and-epp...f738f898b8e5a1
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Old Dec 17, 2015, 12:38 AM
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Quote:
Originally Posted by jkap5t View Post
I need helping finding where to order foam stock. I need high density foam that can be cut using hot wire cutting and can also be machined similar to the insulation sheets at Lowe's or Home Depot. For my wings I need sheets that are 2 inches thick. For the fuselage I need blocks that are at least 5 inches thick which I am having a very hard time finding.
What wrong with the insulation sheets at Home Depot or Lowes?

Usually construction supplies can get you large sheets. Contractors use the foam for as you guessed insulation and they also use them for forming concrete.
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