Processing Defects
Planed lumber can have defects created during processing and sawmilling. These include:
Processor Marks A tree is stripped of branches by a processor. If the hydraulic rolls of the processor are improperly aligned, the rolls will leave marks on the log.
Dog Holes Dog holes are large rough holes created by handling the logs by tools known as dogs, tongs, turners, or other such equipment.
Wane Wane arises when a board includes a portion of the tree’s original surface. As a consequence, a corner or edge of the board is rounded rather than squared.
Tearing of Face Tearing of face consists of parts of the wood being torn out during rough-sawing below the line of cut. When planed, this shows as pock marks or small indentations on the surface of the lumber. This is most common in cedar.
Foreign Objects Foreign objects can become embedded in trees, logs, or lumber and cause damage to the planer. These objects range from stones, nails, and barbed wire to teeth from the sawmill saws
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