What Is A "Winding Stick"
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Sticks" are nothing more than two sticks of stable, kiln-dried
wood that are used to determine if boards have any "wind"
or twist in them.
they're used by laying them across the grain of the wood on
its flat (or face) surface, they're usually only about two-feet
long by 1/2" to 3/4" thick by about 2" wide.
that their opposing (edge grain and face grain) surfaces be
parallel to one another.
make them out of light-and-dark contrasting woods (walnut
and maple, as an example)...or make them both out of maple
and glue a 3/4" wide walnut strip along one edge-grain
edge (remember, both sticks should be the same 2" [or
so] width when finished.
them, lay yur board in question on your benchtop. Lay the
edge (not surface) of one stick across the grain at the far
end of your board (with the light wood edge up)...and the
edge of the other stick across the grain at the near end of
your board (with the dark wood edge up).
down so your eye is approximately even with the stick's top
edge at the board's near end and sight down toward the stick
at the far end of your board. Move your eye closer and farther
away from the near winding stick until you can get a good
view of both sticks when you sight from one to the other.
If the top edges of the winding sticks appear to be parallel
to one another, your board has no twist. If they do not appear
to be parallel, your board is twisted.