[Table of Contents] [Search]


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [BKARTS] wood book covers



Perhaps the language problem here is that "rift" (which means "split")
describes a splitting or shaving operation, while xxx-sawn describes a
sawing operation.
Typically planks are sawn (and thus plain-sawn or quarter-sawn) while veneer
is cut using a sharp knife edge (and is thus rift).
A book I have on veneering mentions "sawing, splitting, riving or slicing"
as four distinct methods of cutting, but only goes on to describe slicing.

By the way, when a log is plain-sawn you still get a couple of planks which
qualify as quarter-sawn.
Similarly when a log is plain-sliced into veneer you end up with a mix of
"plain-sawn" and "quarter-sawn" grain figure. My book also refers to a "rift
figure" which is halfway between plain and quarter.

Rotary-cut veneer is made by rotating the entire log against a knife to
unroll it like a roll of paper towels. This produces wide sheets of veneer
suitable for making plywood.

There is also another "rotary" method which produces veneer very much like
plain-cut, where a half-log is swung on a pivot arm against the cutter
knife.

For veneer the appearance is the most important reason for picking a
particular cutting method:
Some wood looks best in its quarter-sawn figure because this shows off the
medullary rays (oak and lacewood).
Some wood looks best in its plain-sawn figure because this shows off the
growth rings (oak and fir)
Some wood looks best in rotary-cut (maple with bird's-eye grain)
Odd wood pieces (i.e. not logs but burls, crotch, stump and butt) tend to be
plain-cut but often have the most striking grain patterns.

For planks one must also consider that plain-sawn planks are more prone to
warping than quarter-sawn ones.

For a veneer book-cover you might worry about warping as well, since the
veneer is not glued to a stiff heavy board.
-Kevin Martin
 the Papertrail

             ***********************************************
            BOOK_ARTS-L: The listserv for all the book arts.
      For subscription information, the Archive, and other related
            resources and links go to the Book_Arts-L FAQ at:
                      <http://www.philobiblon.com>

        Archive maintained and suppported by Conservation OnLine
                    <http://palimpsest.stanford.edu>
             ***********************************************


[Subject index] [Index for current month] [Table of Contents] [Search]