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Baltic Birch Expansion
Baltic Birch Expansion
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Old 16th December 2017, 03:47 PM   #1
robert1111 is offline robert1111
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Default Baltic Birch Expansion

Hello

I built speakers few months ago. I made the cabinets out of moisture-proof 18 mm baltic birch plywood, Veneered and lacquered. It came out absolutely perfect. I did not use screws, only PVA glue. AND now, I noticed that the seams have expanded a bit. The front and rear plates have expanded, so the seams can be seen under correct lighting. Nothing too bad, just the perfect speakers are not perfect any more.

Is this a common problem?

How can I make sure it wont happen again with my future builds?

Thanks
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Old 16th December 2017, 04:00 PM   #2
scottjoplin is offline scottjoplin  Wales
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Do you mean the seams in the veneer? Pictures would help. I've not heard of the plys separating or expanding
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Old 16th December 2017, 04:15 PM   #3
straight8s is offline straight8s  Canada
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Quote:
Originally Posted by robert1111 View Post

How can I make sure it wont happen again with my future builds?

Thanks
I suggest gluing clamping then drive a 1 1/4" screw every 2 or 3 inches apart. I use ceramic coated robinson decking screws. Drywall screws bite well and surface flush without a countersink bit but I got tired of snapping them off.
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Old 16th December 2017, 04:18 PM   #4
robert1111 is offline robert1111
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Not sure if you can see the photos, if not click on the URL.

Speaker - Google Photos
Click the image to open in full size.
Click the image to open in full size.
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Old 16th December 2017, 04:24 PM   #5
scottjoplin is offline scottjoplin  Wales
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Yes, can see the lines, are those dips or ridges? I'm thinking the glue has shrunk as it's dried and pulled the veneer down
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Old 16th December 2017, 04:36 PM   #6
robert1111 is offline robert1111
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Quote:
Originally Posted by scottjoplin View Post
Yes, can see the lines, are those dips or ridges? I'm thinking the glue has shrunk as it's dried and pulled the veneer down
It is not shrinking glue. I can see and feel that the front and back plate have expanded.
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Old 16th December 2017, 04:45 PM   #7
scottjoplin is offline scottjoplin  Wales
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Gotcha, well, sorry I've never heard of that happening with Baltic birch ply, you are sure that's what it was, it had 13 plys?
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Old 16th December 2017, 04:55 PM   #8
robert1111 is offline robert1111
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Yes 13. This is probably best picture. Can clearly see, that the bottom panel is wider, and they were all flush in the beginning. They have been in the house, so no humid conditions, or temperature fluctuations. I did build them in a bit colder place, but took them inside for a week, before I veneered them, and they expanded suddenly after 2 months time, sitting at my desk.

Next time probably going to use screws, like suggested. But it sure is something that I did not expect to happen. It took me 40 hours to build them. So Im quite disappointed.

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Last edited by robert1111; 16th December 2017 at 05:09 PM.
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Old 16th December 2017, 05:14 PM   #9
scottjoplin is offline scottjoplin  Wales
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Yes, that's a shame, I can't think why that should have suddenly happened
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Old 16th December 2017, 05:35 PM   #10
globalplayer is offline globalplayer  Germany
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Maybe some tension between the layers.
Wood being alive I think you can`t really prevent it.
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