bending plywood
Dave Budd
3 inches from each end of a 24" piece of 5ply (which would be about 6"
wide), how might I make/procure a press suitable for the operation?
--
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Just zis Guy, you know?
<dave...@manchester.ac.ku> said in
<MPG.2297b8f94...@news.individual.net>:
>If I wanted to put a 20 to 30 degree bend (not too tight a radius) about
>3 inches from each end of a 24" piece of 5ply (which would be about 6"
>wide), how might I make/procure a press suitable for the operation?
I usually do this by making a jig, bending some 6mm ply into shape,
and laminating two or three lots of 6mm into one large whatnot.
You might get it to bend by steaming it first.
Guy
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Guy King
from "Just zis Guy, you know?" <u...@ftc.gov> contains these words:
> You might get it to bend by steaming it first.
It doesn't jbex. Not with ply.
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Skipweasel
Eagles may soar, but weasels don't get sucked into jet engines.
Guy King
from Dave Budd <dave...@manchester.ac.ku> contains these words:
> how might I make/procure a press suitable for the operation?
Sorry, with ply you don't. You start with veneer and /make/ curved ply.
Well, sort of. There's a bodge - you can kerf several layers of thinner
ply - slice /nearly/ through them so they're bendy. Then you can
laminate them yourself to molish a thicker ply, but it won't be so
strong.
Were you to make your own, you can make a former by whatever means you
like and then lay up the veneer (ply will do if it's thin enough) and
then shove it in a plastic bag and connect it to the vacuum cleaner. The
sharper the curve, the thinner the layers have to be.
Guy King
from Countess-Palatine Blackberry the Perplexed of Divine
Intervention.<x{yz}enop...@hotmail.com> contains these words:
> IRIA "Blending plywood" and wondered why anyone would bother.
Oh, that's 'cos not everyone likes single-source ply. It can be rather
too woody, so they either blend it or take it with ice.
Lister
wrote:
>The message <MPG.2297b8f94...@news.individual.net>
>from Dave Budd <dave...@manchester.ac.ku> contains these words:
>
>> how might I make/procure a press suitable for the operation?
>
>Sorry, with ply you don't. You start with veneer and /make/ curved ply.
>
Which you then wipe your esra with? :)
Nick Odell
>If I wanted to put a 20 to 30 degree bend (not too tight a radius) about
>3 inches from each end of a 24" piece of 5ply (which would be about 6"
>wide), how might I make/procure a press suitable for the operation?
As has been said elsewhere, you can't bend (modern, epoxy-bonded)
plywood, but if this is a very old, very sheddy piece which was bonded
with hot hide glue, then you could. Laminating your own ply from
veneer and pressing it into shape is pretty k3wl.
Five ply? Five times 0.6mm standard veneers or thick, chunky
shuttering ply with gurt big centre plies?
If you only want something about 3mm thick, consider using solid wood
because that's pretty easy[58] to bend by hand - all it takes is heat,
damp and evenly applied pressure. You could even do it in the kitchen
with a pot of boiling water, a saucepan to bend it round and a flat
piece of scrap wood to bend it with. Or you could borrow an electric
bending iron from my instrument repair workshop, if you want.
If you want to use something fatter, like the shuttering ply , you
could bend a fatter piece of solid wood but it's harder work - after
all if they bend shafts for pony carts, anything smaller than that
must be possible. So here's a bodge instead. With a broad-bladed saw,
kerf the area you want to bend with closely-spaced slots through four
but _not_ all five of the layers. Use heat and moisture to bend very
carefully. Spring the slots open a smidgeon and fill with epoxy. Let
the curves spring back into shape, squeezing out the excess epoxy as
they do so. Leave until set hard.
Nick
[58]I have been doing it for about forty years and I think I'm getting
the hang of it
--
real e-mail is nickodell (at) bigfoot (dot) com
Carlton Miniott
tell me that's only with the old-style stuff.
Solid wood's not really any good for this - it's a skateboard deck. The
bending was for the kicktails.
I have a 31" which is too big for Jack, and I just bought a 17", which
is too small, really (and way too rigid). So I was thinking of making a
24" myself.
But if I have to bond veneers into my own plywood, it's getting a bit
too much, really.
Is it the same sort of resin as in fibreglass?
--
teh internets is populated by eggshells armed with hammers
Melanie Rimmer
> The message <MPG.2297b8f94...@news.individual.net>
> from Dave Budd <dave...@manchester.ac.ku> contains these words:
>
>> how might I make/procure a press suitable for the operation?
>
> Sorry, with ply you don't. You start with veneer and /make/ curved ply.
That's not true. I have bent plywood many times. It's very easy to do.
Here's my procedure:
1. Ohl a nice piece of plywood for a QVL project you have in mind.
2. Store it in the shed, propped up at abou a 60-70degree angle to the wall.
3. Forget about it. The thicker the piece of ply the longer you have to
forget about it.
5 Stack up other stuff against it - bicycles, garden loungers,
lawnmowers, etc. The heavier the better.
4. Assemble enough tuits for the project. Take a day off jbex. Discover
that the ply has sagged and now has a nice curve all across it.
Guy King
from Carlton Miniott <dave...@ukmisc.org.uk> contains these words:
> But if I have to bond veneers into my own plywood, it's getting a bit
> too much, really.
It's surprisingly easy. Carve a mould with a surform out of a slab of
pine - the finish doesn't have to be anything special. Lay polythene
over it to stop the first layer sticking.
Lay up several crossed layers of ply that's thin enough to bend to what
you want, with suitable glue and vacuum-pack. It's really a lot easier
than you think.
Carlton Miniott
> from Carlton Miniott <dave...@ukmisc.org.uk> contains these words:
>
> > But if I have to bond veneers into my own plywood, it's getting a bit
> > too much, really.
>
> It's surprisingly easy. Carve a mould with a surform out of a slab of
> pine - the finish doesn't have to be anything special. Lay polythene
> over it to stop the first layer sticking.
> Lay up several crossed layers of ply that's thin enough to bend to what
> you want, with suitable glue and vacuum-pack. It's really a lot easier
> than you think.
>
>
deck market? I'll take 2...
Guy King
from Carlton Miniott <dave...@ukmisc.org.uk> contains these words:
> Since you know what you're doing, fancy going into the 24" skateboard
> deck market? I'll take 2...
But but but - that'll mean /doing/ something. Anyway, I have no idea
what a 24" skateboard deck looks like!
Carlton Miniott
> from Carlton Miniott <dave...@ukmisc.org.uk> contains these words:
>
> > Since you know what you're doing, fancy going into the 24" skateboard
> > deck market? I'll take 2...
>
> But but but - that'll mean /doing/ something. Anyway, I have no idea
> what a 24" skateboard deck looks like!
>
>
really don't think I could be arsed to do the fabrication bit, I could
maybe do the griptape and the art and the marketing.
24" by 6", 5ply to a total depth of somewhere between 5mm and 7.5 mm,
with the ends something between a semicircle and a parabola (about 3 or
4 inches at each end)
And those ends are tilted about 20 degrees upwards, the bend where the
parabola starts, radius of bend something like 6"
Have a look at any skateboard shop page and scale down what you see from
31" to 24".
If you fancy having a try, I'll provide detailed measurements.
Hmm, just found a site with loads of 28" decks... Not much smaller than
the standard 31" really. I think there's a market for 24".
®óñ© © ²°¹°-°²
wrote and included this (or some of this):
>The message <MPG.22994b538...@News.individual.net>
>from Carlton Miniott <dave...@ukmisc.org.uk> contains these words:
>
>> Since you know what you're doing, fancy going into the 24" skateboard
>> deck market? I'll take 2...
>
>But but but - that'll mean /doing/ something. Anyway, I have no idea
>what a 24" skateboard deck looks like!
It's a skateboard for two feet.
--
®óñ© © ²°¹°-°²
Graeme Dods
news:MPG.22995a036...@News.individual.net:
> Hmm, just found a site with loads of 28" decks
IRTA as 28"... no, I'll just leave it at that. Suffice to say there
probably are sites which feature 28" versions of things which are normally
considerably shorter (Photoshop one would assume).
--
Graeme
Rusty Hinge 2
from ®óñ© © ²°¹°-°² <r...@spamall.com> contains these words:
> On Sat, 17 May 2008 21:25:28 +0100, Guy King <guy....@zetnet.co.uk>
> wrote and included this (or some of this):
> >But but but - that'll mean /doing/ something. Anyway, I have no idea
> >what a 24" skateboard deck looks like!
> It's a skateboard for two feet.
Oh, grone to the power of n!
<Oscar>
I wish I'd gooved of that.
</Oscar>
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Rusty
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Paul C. Dickie
>On Fri, 16 May 2008 16:30:42 +0100, Dave Budd
><dave...@manchester.ac.ku> wrote:
>>3 inches from each end of a 24" piece of 5ply (which would be about 6"
>>wide), how might I make/procure a press suitable for the operation?
>
To get more fibre in their diet, silly...
--
< Paul >