folding ply table on the go

ddashk
New Member

Posts: 28

folding ply table on the go May 13, 2008 17:03:59 GMT

Post by ddashk on May 13, 2008 17:03:59 GMT

here's a folding table im making at the moment. these are sketch-up models. the strip on top is carbon fibre. the panels are made from a sandwich. the skins are 1.5mm birch ply. the skins are seperated by 15mm by 50mm rails. the core is epp foam. the other photos are the panels being constructed. you can see from the (dodgy) photos that the rails are 40mm pine and 10mm purpleheart. birch ply is so nice to work with. i love it.

Scrit Administrator Cast Iron Administrator Posts: 1,275	folding ply table on the go May 13, 2008 19:44:18 GMT Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Scrit on May 13, 2008 19:44:18 GMT Interesting ideas! How are you bonding the carbon fibre to the EPP foam? Scrit
	Sumus in excretia, solon profundum variat

ddashk
New Member

Posts: 28

folding ply table on the go May 13, 2008 21:01:13 GMT

Post by ddashk on May 13, 2008 21:01:13 GMT

the rest of the table is bonded with cascamite. i will experiment with that. its quite a large surface area compared to the forces involved. i know that epoxy works very well with CF but i need to check that it won't welt the epp.
any suggestions?
im using a vacuum press with heated elements. 3/4 of a tonne per square foot. cascamite is in and out in 4-5 mins.

9fingers
Senior Member

Making Sawdust In Romsey Hants

Posts: 291

folding ply table on the go May 14, 2008 12:35:57 GMT

Post by 9fingers on May 14, 2008 12:35:57 GMT

I'd be surprised if the epp will be attacked by the epoxy. I've used epoxy on a huge range of materials over the years and not knowingly had anything disolved by it. It is usually the solvent based adhesives that you need to test first (and for more than a few seconds too DAMHIKT!).
Xylene, Toluene and Styrene based ones are the worst. - Must be the ...ene that does the damage

Bob

Last Edit: May 14, 2008 12:36:19 GMT by 9fingers

ddashk New Member Posts: 28	folding ply table on the go May 14, 2008 12:55:54 GMT Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by ddashk on May 14, 2008 12:55:54 GMT the carbon is in the post so when it comes i can try some different glues as i have a tiny bit of waste.

ddashk New Member Posts: 28	folding ply table on the go May 21, 2008 17:52:07 GMT Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by ddashk on May 21, 2008 17:52:07 GMT so cascamite does definitely not stick to carbon fibre/epoxy sheet. i ended up glueing it with epoxy resin.

ddashk New Member Posts: 28	folding ply table on the go May 25, 2008 18:14:42 GMT Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by ddashk on May 25, 2008 18:14:42 GMT i've finally found hinges i think suit the rest of the table. they're nylon marine items and much lighter than stainless ones i was thinking of. this is what the look like in a test piece with ss screws.

mikeb New Member Posts: 14	folding ply table on the go May 26, 2008 9:06:19 GMT Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by mikeb on May 26, 2008 9:06:19 GMT Interesting stuff!! Where are you getting the carbon fibre from??

ddashk New Member Posts: 28	folding ply table on the go May 26, 2008 10:09:45 GMT Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by ddashk on May 26, 2008 10:09:45 GMT there's a guy called carbon stuff on ebay who sells what i think are offcuts from a bigger business. he sometimes has a3 sheets of 1.5mm for £30. its really good quality and looks amazing.

ddashk
New Member

Posts: 28

folding ply table on the go May 27, 2008 17:38:11 GMT

Post by ddashk on May 27, 2008 17:38:11 GMT

all the panels are being glued in a vacuum press. 17.5 grand and someone put a hole in it. unbelievable. so all gluing up is on hold. decided to start hinging what i had so far. this is how it looks now.

a closeup of the carbon fibre. that's just upholstry webbing hold the desk up for now. theres less carbon fibre than in the drawings cos i was pressed for time and thats all i could get that day.