gluing in curves

[Electric Comet]

looking at getting some very thin birch plywood and bending a layer
and then gluing a layer to that perhaps repeating for a few or more
layers

the missing info is will that bend remain and not break or lose the
original form

think of a u shaped head band or hair band


my concern is the glue will not remain flexible but maybe it does not
need to


ultimately i will have to experiment but if you have tried this how
were the results

[Scott Lurndal]

Electric Comet <electri...@mail.invalid> writes:
>
>looking at getting some very thin birch plywood and bending a layer
>and then gluing a layer to that perhaps repeating for a few or more
>layers

A google search for "Bent Laminations" will answer all
the questions that you've asked.

[Swingman]

To OP: Two layers of 3/4' birch plywood, curved and laminated. Photos
should be self-explanatory:

https://goo.gl/photos/xrooS5JqASyPrFMx7


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[bnw...@gmail.com]

Spend some time reviewing boat building sites. Very common there, have done it myself, eg a laminated stem for a 22' pulling boat I am in the process of building. For approaching or surpassing 90 degrees, I have pre-bent the laminations in hot water before final gluing (actually thickened epoxy) hoping to minimize the possibility of failure...The sharper the angle, the thinner, and more plentiful, the laminations...try it and see how it goes...seems to me you believe in prototypes, here's a situation where it makes perfect sense...

[John McCoy]

Electric Comet <electri...@mail.invalid> wrote in news:o29fh8$ttj$5
@dont-email.me:

>
> looking at getting some very thin birch plywood and bending a layer
> and then gluing a layer to that perhaps repeating for a few or more
> layers
>
> the missing info is will that bend remain and not break or lose the
> original form

As bnwelch said, this is common thing in boatbuilding. You
can find sites which will include tables to tell you how
thin you need to cut your wood for different radius curves,
and how much springback (the amount of curve you lose when
you take the clamps off) you can expect.

BTW this will work better if you use solid wood rather than
plywood. Plywood really doesn't care for bending.

John