Double Bandsaw - a set of two large toothed metal bands, driven by two wheels each, placed in a way that one side of each band is parallel with one side of the other and can be set to varying distances to make parallel cuts of specified widths.Back

Knot¹ - a portion of a branch or limb that has become incorporated into a piece of lumber. In lumber, knots are classified as to form, size, quality, and occurence. A red knot is one that results from a live branch growth in the tree and is intergrown with the surrounding wood. A black knot is one that results from a dead branch which the wood growth has surrounded.Back

Knuckle Boom - a crane-like apparatus with a hinged boom and a grapple that allows relatively light loads to be moved in any direction quickly.Back

Lumber Size - each piece of lumber that does not fall within set widths and thicknesses must be downgraded according to the amount of deviation from the standard.Back

Skip¹ - an area on a piece of lumber that failed to surface cleanly.Back

Splits¹ - a seperation of the wood through the piece to the opposite surface or to an adjoining surface.Back

Wane¹ - bark or lack of wood from any cause, except eased edges, on the edge or corner of a piece of lumber.Back

Warp¹ - any deviation from a true or plane surface, including bow, crook, cup, and twist or any combination thereof.

Bow¹ - a deviation flatwise from a straight line drawn from end to end of a piece. It is measured at the point of greatest distance from the straight line.
Crook¹ - a deviation edgewise from a straight line drawn from end to end of a piece. It is measured at the point of greatest distance from the straight line.
Cup¹ - a deviation in the face of a piece from a straight line drawn from edge to edge of a piece. It is measured at the point of greatest distance from the straight line.
Twist¹ - a deviation flatwise, or a combination of flatwise and edgewise, in the form of a curl or spiral, and the amount is the distance an edge of a piece at one end is raised above a flat surface against which both edges at the opposite end are resting snugly.

¹Southern Pine Inspection Bureau Standard Grading Rules 1994 Edition, Southern Pine Inpection Bureau, Pensacola, Florida, 1994, Pages 114-127.Back