On Mon, 15 Aug 2016 08:21:16 -0700, 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."

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. ;-)

From another woodworking website:

"On the average, wood gains or loses about 1 percent moisture content for
every 5 percent change in the relative humidity."

"The rule of thumb is that if the board shows mostly flat grain on its
face, allow for 1�„4 inch total wood movement for every 12 inches across
the grain. If it shows mostly quarter grain, allow for 1�„8 inch movement.
This will accommodate an annual change of 8 percent moisture content €”
much more than is common in most areas."

Note the last sentence. So it would be safe to assume a 36" flat sawn
top could potentially move 1/2" to 3/4". If the connector is mounted
right, it would only have to move 1/4" to 3/8".

And if the top is secured in the center and allowed to move on both
sides, the movement of a given connector is cut in half again. Now we're
down to 1/8" to 3/16".

Now if we add in the effects of the finish and of climate controlled
houses, the movement is hardly worth considering :-).


--
When fascism comes to America, it will be wrapped in the flag and
carrying a cross.