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wood with dissimilar expansion rate techniques ?
wood with dissimilar expansion rate techniques ?
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Old 20th March 2020, 08:13 PM   #21
AudioFanMan is offline AudioFanMan  United States
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Join Date: Feb 2020
Location: Long Island
Quote:
Originally Posted by K.A.B View Post
I'm going to be picky here bamboo is not a wood, it is grass, regardless of what others write and say.

Grass or Wood, when almost anything can absorb moisture, it typically gets bigger. See below for more on this...


Quote:
Originally Posted by bobberner View Post
There could be a chemical reaction between the bamboo and the iron in your clamps causing the stain.

The clamps have plastic feet.


Probably considered cross posting, but reliant to the grass vs wood hangup


As a highly scientific test, I took two bamboo board cut offs, that measured almost exactly the same.

1 was 1.080 and the other 1.082...
Put one in a cup of water, nearly 24 hours later it measures 1.090 So, it grew 8 thou when soaking wet. Dont imagine it could get much wetter.
In comparison the second block was placed on a warm surface (Laptop power supply) for almost 24 hours and it now measures 1.076 or a reduction of 4 thou...

Even if I take the difference, of the two, add them its .012

Since the samples were almost 1" to begin, and my widest panel is 15" I multiply the .012 by 15 and I get a whopping .180 or a hair under 3/16"

Since I don't plan on submerging these anytime soon, Id say that's pretty dang stable.

All in all, I still need to make some allowances, but clearly a heavy 16th to an eight of space per edge should do it...



That said, adding 3/4" bamboo board as a skin say to an aluminum frame that wont move, or another wood that moves more, allowances need to be made...
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