we cut faster (and still be safe)
so that the saw is not in the cut
so long. Fewer teeth in the saw
can also help. Oftentimes this
changes cannot be done because
the saw’s horsepower is too low. QIn order to increase yields in the rough mill with a rip first
operation, we have
asked our people that mark the
strips for our automatic chop saws
to mark as close to the knots as
possible. Indeed, this increased
yield, but the grain around the
knots was especially hard to glue
and with the yield emphasis, we are
getting more of this rough grain.
The bottom line is that we have
increased our gluing failures.
AYou have hit on one very important concept in rough mill yield improvement
and that concept involves the
definition of what is a defect. It
is certainly easy to define knots
as defects, but as you noted the
cross-grain around the knot is
hard to glue (and also hard to
machine well). So, I maintain
that such cross-grain can and
probably should be included in
the definition of a defect.
Unfortunately, some people
who write about yields, computer
simulations, rough mill
performance and so on do not
have this practical experience
factored into their suggestions.
In fact, in some species, such as
hard and soft maples, in addition
to gluing and machining, the
color variation around a knot
due to cross-grain light reflecting
properties could also support
calling this grain a defect.
A second consideration when
WOOD DOCTOR’S Rx
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