Examine different cuts of wood or blocks of wood showing the three planes of cut as in fig. 15.7. When the wood is sawed w ith a radial cut, the plane of the cut is along the radius of the log. The growth rings appear as more or less continuous vertical lines and fairly evenly spaced if the tree had regular growth. In reality, only a few boards can be cut along the radius. To get the most boards from a log, the mill cuts the log tangcntially so that the plane is at right angles to the radius of the log. The cutting plane intersects the growth rings in such a way that thcv look like parabolas or portions of parabolas.
When wood is sawed with a transverse cut, the plane is perpendicular to the long axis of the log. Growth rings appear as concentric circlcs. Rays appear as lines radiating from the center. Typically, this type of cut promotes more splitting and w arping of the board, so mills do not saw the broad surfaces of boards transversely.
b. Tangential cut ^ c. Transverse cut
FIGURE 15.7 THE DIRECTION IN WHICH THE LOGS ARE SAWN DETERMINES THE PATTERNS ON THE FINISHED WOOD. (A) THE RADIAL CUT, ALSO KNOWN AS QUARTER-SAWN, PRODUCES PARALLEL LINES ON THE BOARD. (B) THE TANGENTIAL CUT. CALLED PLAIN-SAWN. PRODUCES WAVY BANDS. THE TRANSVERSE CUT (C) IS THE END OF EACH BOARD.
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