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Adventures in Curved plywood.
Adventures in Curved plywood.
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Old 28th June 2011, 02:37 AM   #11
bear is offline bear
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Adventures in Curved plywood.
I believe the pros who bend use steam...

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Old 28th June 2011, 02:42 AM   #12
aardvarkash10 is offline aardvarkash10  New Zealand
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considered paper mache?
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Old 28th June 2011, 02:10 PM   #13
boywonder is offline boywonder  United States
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Default I have a steam iron.

Quote:
Originally Posted by bear View Post
I believe the pros who bend use steam...

_-_-bear
Bear: I'm a rank amateur who has the capability of making lots of sawdust and firewood........I think you'd need a steam engine to bend 18mm BB though...

I had high hopes for 3/8" wigglewood.....complete failure; it won't bend nearly tight enough.
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Old 28th June 2011, 02:39 PM   #14
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A couple sawhorses, some polyethylene area cover (as used in painting) and an electric teapot will do the job, with gravity.

Not so much with 18mm BB ply though, you'd have to go to smaller layers.
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Old 28th June 2011, 03:49 PM   #15
ebattleon is offline ebattleon  Trinidad and Tobago
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considered paper mache?
Actually as silly as that sounds it could work...but not "paper mache". What i am thinking is several layers of thin card built up with glue. It should work.
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Old 28th June 2011, 05:05 PM   #16
evanc is offline evanc  United States
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Adventures in Curved plywood.
The last cabinet shop I worked for did a lot of curved plywood construction. We almost always used layers of 1/8" ply, usually 6 layers, veneered inside and out. The resulting product is amazingly stiff, and springs back almost not at all when taken off the form. The wood on wood 2 ply veneer bends a tight radius and the edge does not show a black line. Anyway.... regardless of the exact materials you use if you do a careful job I'm sure you will get an excellent result.
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Old 28th June 2011, 05:25 PM   #17
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Quote:
Originally Posted by evanc View Post
The last cabinet shop I worked for did a lot of curved plywood construction. We almost always used layers of 1/8" ply, usually 6 layers, veneered inside and out. The resulting product is amazingly stiff, and springs back almost not at all when taken off the form. The wood on wood 2 ply veneer bends a tight radius and the edge does not show a black line. Anyway.... regardless of the exact materials you use if you do a careful job I'm sure you will get an excellent result.
As does our shop as well - the key to structural integrity would be to not use contact cement or white glue - (both are too flexible) but something that cures rigid like yellow carpenter's glue, the vacuum press material that Evan mentioned or a 2-part catalyzed adhesive.

Of course you're likely finding that the toughest part of the project is building sturdy form /frame upon which to laminate your layers of material.
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Old 28th June 2011, 06:03 PM   #18
boywonder is offline boywonder  United States
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Well, once the first layer is wrapped/glued around the formers it's there for life, so no spring-back to worry about.

I'd love to use yellow PVA glue for the layers of 1/8" bending ply but I don't know how I'd hold everything together without a vacuum bag, that's why contact cement is so appealing......

For tooling, I pretty much have what's shown in the pics; various clamps and straps.

I do have several vac pumps and vacuum regulators, so the bag approach is interesting, I just need a vac bag and some skill.
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Old 28th June 2011, 07:00 PM   #19
evanc is offline evanc  United States
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Adventures in Curved plywood.
bags are not too expensive. But your form needs to be strong enough to not implode when you apply the vacuum.
[/B]Dura-Max? Vinyl Vacuum Bags: Simple & Affordable

For curved work the breather mesh works great to allow the air out that would otherwise be trapped by the bag where it touches the project. Trapped air stops the bag from pressing where the bubble is.
DIY Vacuum Bagging Parts - Build Your Own and Save

then definitely the unibond 800 as glue.

As far as skill goes you need a helper to get everything glued and in the bag. Then a dry run to make sure you got it and your good to go.
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Old 28th June 2011, 07:16 PM   #20
boywonder is offline boywonder  United States
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Thanks for the links Evan! I think I have 99%+ of the parts required to make a DIY vacuum pump setup........another project....
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