| Subject: | RE: [RESOGUIT-L] Rip Sawn? | | Date: | Sunday, October 9, 2005 20:38:50 (-0700) | | From: | Richard DeNeve <richard_d13132 @.....com>
|
As far as SAWS (hand saws) are concerned, a rip saw is
used to cut a board or tree along the length of it. A
crosscut saw is used to saw across a board to shorten
it. Crosscut saws have finer teeth, usually 12-16
teeth per inch, and a bit wider set than rip saws.
The "set" is achieved by bending the tips of the teeth
out alternately from the plane of the blade. This
makes the "kerf" - the width of the slot cut by the
blade - fairly wide so the blade does not bind in the
the slot. More teeth in the crosscut saw
make sawing slightly easier in sawing across the
growth rings, and makes splintering on the far side of
the board less severe.
Rip saws usually have about 6-10 teeth per inch in
hand saws, and deeper gullets (the empty space between
the tips of the teeth). The wood being cut in rip
sawing is often quite thick, and the deep gullets
allow for the collection of more sawdust during the
passage through the wood. The teeth are also usually a
little more agressively sloped; that is, they are more
nearly perpendicular to the bottom of the slot being
cut.
On a band saw, whose blade travels something over 2000
feet per minute, I use a blade with 6 teeth per inch
for cross cutting wood up to 4 inches thick and
ripping up to about 3 inches thick. I use blades with
3 teeth per 2 inches for "resawing" wood for guitars,
where a piece 2-4 inches thick by up to 8 inches wide
and up to 36 inches long is sawn into several pieces
3/16 inches thick for guitar sides and backs.
Quarter sawn wood, as Lynn said, is ripped into boards
along a radius of the cylincrical tree trunk. If you
look at the end of a quarter sawn board, the growth
rings will go from front to back.
Wood ripped along a chordal plane to the cylinder is
plain sawn or slab sawn. If you look at the end of
the board, the arcs of the growth rings will be more
or less parallel to the wide surface of the board.
Rift cut wood is sawn in between the slab and quarter;
the growth ring angle on the end of the board is 45
degrees, more or less, to the sides.
Which is probably more than you need or want to know.
Dick DeNeve
--- "laruepork@netzero.com" <laruepork@netzero.com>
wrote:
> Thanks Lynn, another one printed and saved to the
> luthier binder.
>
> I surely appreciate it all.
>
> Apparently my Jr. Hi Shop Class info about rip and
> crosscut is of NO relation to the subject at
> hand!!!! lol
>
>
>
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