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Cupping and twisting in very thin peices

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Forum topic by Cygnwulf posted 06-20-2013 01:14 AM 650 views 0 times favorited 3 replies Add to Favorites Watch
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Cygnwulf

30 posts in 780 days


06-20-2013 01:14 AM

Topic tags/keywords: veneer twist cupping movement

Ok, so I posted a project a little while back where I was experimenting with thin wood bookmarks made by doing a small marquetry piece and then applying it to another piece of veneer as a substrate. Unfortunately so far the experiment has not been a total success. I’m happy with the strength and durability of them, and my wife has been very happy with her’s, with one caveat: it twisted.
Had it cupped it wouldn’t be as noticeable, but twisted takes a little something away from it.
Now, I know the wood moves, but I was hoping to find some way to avoid the worst of it. So far, the only test pieces that haven’t twisted were the ones that had a good amount of crossing grain, the ones where the grain in both layers mostly runs the same way are the ones that are twisting. the cross grain ones still cup a bit but it’s not horrible.
A test peice I did that deliberatly crossed the grain from the front and back cupped some but did so evenly.

I did one test that had 3 layers, with the core going across the others, and this one stayed very flat.

I realize that I’m not going to eliminate the wood movement but I would like to minimize or control it.

I’m wondering if this is a project that I’m just going to have to give up on, or if anyone might have any suggestions on other solutions I might try to either minimize the twist or at least even it throughout the finished piece? I am using mostly either very straight grained veneer or some highly figured ones.

-- Stephen H -- If it ain't broke, it probalby still needs fixing....


3 replies so far

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bondogaposis

2528 posts in 1007 days


#1 posted 06-20-2013 04:07 AM

I did one test that had 3 layers, with the core going across the others, and this one stayed very flat.

That’s your answer right there. Laminations must be balanced top, bottom and middle.

-- Bondo Gaposis

View Rick M.'s profile

Rick M.

3975 posts in 1036 days


#2 posted 06-20-2013 07:19 AM

Yep, rule of thumb with lamination is that whatever you do to the top, you do to the bottom.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

View Nomad62's profile

Nomad62

710 posts in 1614 days


#3 posted 06-20-2013 08:24 PM

The vast majority of wood movement is from moisture movement; while you didn’t say which glue you used, make sure it is one that is not water based and you may get better results.

-- Power tools put us ahead of the monkeys

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