TECHNIQUE

RIFT & QUARTERED SAWN

Rift and Quartered are terms that refer to the visual characteristics of the grading face of each blank. The “ray fleck,” “flake,” or “figure” of a quarter-sawn blank is the medullary ray of the log, which emanates outward from the center of the log like spokes of a wheel. The degree to which this “ray fleck” is revealed is a function of the angle of the growth rings to the face of the blanks. When the growth rings are 90 % to the face of the blank the medullary ray is opened the greatest extent possible. As the angle of the growth rings to the face of the blank decreases, less medullary ray fleck or (Quarter Sawn) is revealed. Rift blank and Quartered blanks share one characteristic. The growth rings manifest themselves on the face of the blank as straight grain, with no visible cathedral grain or plain sawn look.

RIFT SAWN

Rift sawing is a technique of cutting blanks from logs. Each blank is cut along a radius of the original log, so that the saw cuts at right angles to the tree’s growth ring. This produces lumber of great stability.

QUARTER SAWN

Quarter-sawing gets its name from the fact that the log is first quartered lengthwise, resulting in wedges with a right angle ending at approximately the center of the original log. Each quarter is then cut separately by tipping it up on its point and sawing blanks successively along the axis. That results in blanks with the annual rings mostly perpendicular to the faces. Quarter sawing yields blanks with straight striped grain lines, greater stability than flatsawn wood, and a distinctive ray and fleck figure. It also yields narrower blanks, because the log is first quartered, and is more wasteful.

 

Quartersawn blanks can also be produced by cutting a blank from one flat face of the quarter, flipping the wedge onto the other flat face to cut the next blank, and so on.

PLAIN SAWN

In plain sawing the log is passed through the blade cutting off blank after blank without changing the orientation of the blade or log. The resulting blanks have different annual ring orientations when viewed from the end. The relative angle that form the rings and the surface go from almost zero degrees in the external blanks to almost ninety degrees at log core.