In
order to specify veneer that has very straight grain without the flame pattern, in most cases Quarter Sliced or Quartered
veneer is specified. The quarter of a log is mounted on a plate
so that the growth rings are perpendicular to the plate, and the
plate is raised and lowered against the blade in a direction radial
to the center of the log. Quartered leaves cut consecutively are
narrower than plain sliced and typically contain straighter grain.
The cut requires the largest diameter logs, usually from tropical
species. However, quartered white oak is often sliced specifically
for its appearance of flake, which is actually created
by the veneer knife bisecting radial tubules in the tree structure,
called medullary rays. In most species these medullary rays are
so small as to be unnoticed in the grain pattern, but in the oak
family they produce the distinct flake marking. The ray flake
should not be considered a defect, but rather a personal aesthetic
choice on the part of the designer. Quartered cherry, ash, maple,
and red oak are usually the portions of a flat cut log where the
heartwood is defective or is wide enough to be clipped and used
as quarters. Quarter cut leaves can easily be sequenced and matched.
Typical
quartered grain pattern.