Bowing upon resaw

"Carl E. Wasmuth, Jr." <[email protected]> wrote:

>I am starting to resaw some boards to make drawer side of 1/2 inch. The
>faces of the board to be resawn have been made parallel to each other before
>resawing. The board has a moisture content of about 6%. When I complete
>the cut the boards tend to bow away from each other. Short of face jointing
>and planning them back to parallel, is there a way to get them straight
>again? Is there a book or article that will explain this phenomenon in
>wood?

How long have you waited? Fwiw, a lot of tension exists in wood.
Before you cut a board in the middle (assuming - dangerous) the stress
was balanced. Afterwards not so. Try stacking your halves outside in
and give it some time. The core might be a bit wetter than the
outside. I doubt most boards are totally homogenus.

I base this observation on watching the antics of logs I cut on my
band mill.

my $.02

Wes

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I agree - also a dull blade will follow grain giving the bowed result
(not-with-standing all the bandsaw tuning articles, dull blades are the
cause of a lot of bad bandsaw results, not only just rewawing). I use
Timberwolf blades with excellent results. Further, a resaw blade is really
a rip blade and should have a minimum of teeth for good sawdust removal. A
high tooth count will clog sawdust in the kerf resulting in heating the
blade resulting in dulling the blade all resulting in a bad result. I have
resawed Jatoba up to 5" on a shopsmith bandsaw using a 1/2" X 4tpi blade
(really) which only required one light pass on the jointer to remove saw
marks.
"Swingman" <[email protected]> wrote in message
news:[email protected]...
>
> "Carl E. Wasmuth, Jr." wrote in message
> > I am starting to resaw some boards to make drawer side of 1/2 inch. The
> > faces of the board to be resawn have been made parallel to each other
> before
> > resawing. The board has a moisture content of about 6%. When I
complete
> > the cut the boards tend to bow away from each other. Short of face
> jointing
> > and planning them back to parallel, is there a way to get them straight
> > again? Is there a book or article that will explain this phenomenon in
> > wood?
>
>
http://www.amazon.com/exec/obidos/tg/detail/-/0918804051/104-8209264-6302316
?v=glance
>
> Also, take a close look at the grain direction and the type of cut (rift,
> plain, quarter) the wood comes from ... it will give you a clue as to what
> to look for in the future before resawing.
>
> Also do a Google on "reaction wood" to gain a better understanding of
that
> phenomenon.
>
> Realistically, you need to grab the next board until you find one that
> doesn't exhibit the behavior.
>
> --
> www.e-woodshop.net
> Last update: 5/15/04
>
>

"Carl E. Wasmuth, Jr." wrote in message
> I am starting to resaw some boards to make drawer side of 1/2 inch. The
> faces of the board to be resawn have been made parallel to each other
before
> resawing. The board has a moisture content of about 6%. When I complete
> the cut the boards tend to bow away from each other. Short of face
jointing
> and planning them back to parallel, is there a way to get them straight
> again? Is there a book or article that will explain this phenomenon in
> wood?

http://www.amazon.com/exec/obidos/tg/detail/-/0918804051/104-8209264-6302316?v=glance

Also, take a close look at the grain direction and the type of cut (rift,
plain, quarter) the wood comes from ... it will give you a clue as to what
to look for in the future before resawing.

Also do a Google on "reaction wood" to gain a better understanding of that
phenomenon.

Realistically, you need to grab the next board until you find one that
doesn't exhibit the behavior.

--
www.e-woodshop.net
Last update: 5/15/04