On 4/7/2014 12:50 PM, Mike Marlow wrote:
woodchucker wrote:
This guy Jack Houweling puts it in perspective.
https://www.youtube.com/watch?v=11FS...em-uploademail

Geez I knew it moved, but when you see how a trapped wood movement can
appear it's remarkable.

Well, it is interesting, but not very true to real life. For one, wood does
not move as much in that direction as it does against the grain. For
another - his video does not take into consideration the constraints on the
wood. If his video were to be taken as gospel, there is not a wooden floor
in the world that would remain stable through the changing seasons. Yet
another theoretical exercise that does not reflect the real world.


Actually you should watch his other video, what he does, is setup a test
across the grain. He cuts a piece of wood, cutting across the grain. He
puts it in a box to dry it out. Just a box with a light bulb.
He measures the difference between the original piece and the dried
piece. That is where he is using his offset amount from.

So yes it does move that much. His example is just taking the difference
in wood movement that he measured, and also less than what he measured.

So it is really enlightening. A small sliver adds up to lots of bending.

--
Jeff