Bendy serrated wood sheets - how to use?

[andyjevans]

I've been eyeing up these bendy serrated sheets in DIY stores - they are designed to make curves. For a start, what are they called in the trade - so I can look them up in searches? then, obvious question, what's the best way to use them to make curved speaker enclosures. I'm thinking of a straight front baffle with this sheet forming a curve round the back, and top and bottom plates to follow the curves.
Now, these sheets are pretty thin, so you would need two with some material in between. Sand is an obvious one, but I wonder about plaster, and again some sort of resin stuff you could mix in a bucket and add mass to. Any good ideas? Andy

[pinkmouse]

I've always seen it called bendy ply or bendy MDF, even in the trade.

I have a similar design to your concept, and I tried double layer with expanding foam, double layer with sand, and then chopped out the outside layer and used 30mm of sand and cement render. The outside was finished up with fake metal flooring vinyl.

Heavy, but they sound much better...

[andyjevans]

I have a similar design to your concept, and I tried double layer with expanding foam, double layer with sand, and then chopped out the outside layer and used 30mm of sand and cement render. The outside was finished up with fake metal flooring vinyl.>

I'm a bit thick on Sunday nights - just finished building a valve amp and exhausted. I don't quite follow the above - could you describe it all in idiot speak? (Sorry!!) Andy

[Jim Griffin]

You might try 'tambour' as in roll top desks and other curved wood products applications.

[ruerose]

i recall a tecnique i am going to try on my next project with MDF:

Kerf-cut Bending

Kerf-cut bending is done by using your saw to cut slots across the stock. This will allow the stock to be bent because the kerfs can compress together. The kerfs are usually only used on the inside of the bend. If you want to make a more complex curve, perhaps an S- shaped curve, you would cut the kerfs on the inside of each bend, then you would use a veneer you cover the entire piece.

EDIT: Zaph was where I first about it:
http://www.zaphaudio.com/audio-speaker20a.html

[trusound]

I'm building my first pair of loudspeakers"which happen to be open baffle" using bendy board..comes in 1/8 and 3/8 thickness...also different grains which allow the board to bend long ways or shortways...take a look on what I did using it...my baffles is over an 1.5" thick and I put a layer of fiberglass between each layer..
http://pg.photos.yahoo.com/ph/randy_...89.jpg&.src=ph
http://pg.photos.yahoo.com/ph/randy_...a3.jpg&.src=ph
http://pg.photos.yahoo.com/ph/randy_...31.jpg&.src=ph

then you can smooth it out using a product called duraglass
http://pg.photos.yahoo.com/ph/randy_...d4.jpg&.src=ph
http://pg.photos.yahoo.com/ph/randy_...cf.jpg&.src=ph
http://pg.photos.yahoo.com/ph/randy_...35.jpg&.src=ph
http://pg.photos.yahoo.com/ph/randy_...e9.jpg&.src=ph