On 08/15/2016 10:21 AM, DerbyDad03 wrote:
Stolen without permission from:

http://www.woodworkerssource.com/shop/wmov.html

"A 36" wide top, made with flat sawn lumber, can move more than an inch
with a 10% change in moisture content."

That comment was included in the following paragraph:

"Allow tops to move freely. Attach tops with Figure 8 Connectors, Z clips,
shop made blocks or elongated screw holes. All of these methods will
securely attach the top but all (sic) it to move across its width. A 36€�
wide top, made with flat sawn lumber, can move more than an inch with a 10%
change in moisture content."

I'm pretty sure that a Figure 8 connector is not going to handle movement
of "more than an inch" unless it's a *really* big one. ;-)

Well, it's not a mistake in terms of what's possible, but it assumes the
10% is an absolute MC, not relative to dry. Absorbing 10% absolute
moisture would require soaking it and maybe not even then...

The amount of shrinkage calculated is:
1.1057 inches
or:
1 3/32 inches
(rounded to nearest 1/32 inch)

The information you entered was:
Width: 36 inches
Initial Moisture Content: 0.1 (decimal percentage value)
Final Moisture Content: 0.2 (decimal percentage value)
The type of lumber you chose was: Flat Sawn

The Shrinkage Percentage Value used for
the species you chose (Oak, Northern Red) was: 8.6%

http://www.woodweb.com/cgi-bin/calculators/calc.pl?calculator=shrinkage

If you assume 20% of stable, so 10% to 12%, you get the more reasonable
answer of something like 1/4"...

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