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Old 29th April 2013, 03:38 AM   #1681
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Oops - it looks like I posted this in the wrong thread. I've reposted it in the cornu spiral thread. Sorry about that!
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Old 29th April 2013, 05:13 PM   #1682
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Part of the idea behind 'corners' in the spiral is that it will damp the higher frequencies better. I'm sure Mr. C experimented with true spirals before deciding on the Cornu.
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Old 29th April 2013, 06:25 PM   #1683
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Quote:
Originally Posted by sreten View Post
Hi,

For laminates the core isn't really the issue. Layered cardboard
varnished with polyurethane is very strong and light, and some
cheap furniture (storage boxes mainly) is made this way.

For paper foam board I'd suggest a varnish layer on the outside and
when its very near dry adding a layer of heavy duty aluminium foil.

Or varnish and let it dry, then add the foil with contact adhesive.

rgds, sreten.

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Originally Posted by sreten View Post
Hi, Make such a laminate and you'll soon work out what it does, rgds, sreten.

Outside dual foil layers stiffen softer laminates by a very large amount.
As exemplified by the leak sandwich advert, where a man stood on a cone from the leak sandwich speaker, which was constructed from aluminium laminated over foam core.

Could also try gluing bits of stainless steel sheet to both sides.

There are also various heavier duty versions of foam core cardboard, such as foamex.

Foam is also pretty easy to CNC, so one could potentially cut the form and then spray it with a fiber impregnated resin and / or apply a metal skin.
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Old 29th April 2013, 06:52 PM   #1684
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Once upon a time... Surfboards are made of very soft sculpted foam covered with fiberglass and epoxy or other resin. They are quite stiff in bending mode but can be fragile in localized compression (aka dings).
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Old 29th April 2013, 08:52 PM   #1685
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Ok, getting closer to having a RatShackFoamcore playing. Found some extra time and got some extra bracing put in, a second layer for the baffle speaker wire and stuffing, then glued on the other side. Waiting for glue to dry sucks.

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Old 29th April 2013, 09:34 PM   #1686
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I agree, that's why I try and time it so I am gluing the last piece on just before bedtime.
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Old 29th April 2013, 10:18 PM   #1687
xrk971 is offline xrk971  United States
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Motownman,
Very nice work! Can't wait to see you fire it up.
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Old 29th April 2013, 11:18 PM   #1688
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Quote:
Originally Posted by xrk971 View Post
Once upon a time... Surfboards are made of very soft sculpted foam covered with fiberglass and epoxy or other resin.
Aren't they still? Heck, I remember when they were about twice as long and made of wood.

Am I dating myself?

EDIT: I see you said 'are' made not 'were' made.
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Old 30th April 2013, 12:50 AM   #1689
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Once upon a time I used to surf...
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Old 30th April 2013, 01:21 AM   #1690
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I still do. Right now I'm here but in a couple minutes I be surfing some other site.
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