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Kerf

The groove left in a board when cut by a saw blade that is equivalent to the saw blade's width.


Key

A small piece of wood that is used to strengthen or accent the corner joints of mitered projects. With keyed joints, the project is usually assembled and glued together first. Then, after the glue has dried, the keyways are cut and the keys are glued into position. Keys can be virtually any shape (square, dovetail, "butterfly", etc.) and are, in most cases, visible after assembly.


Kickback

A dangerous situation whereby a rotating blade, cutter or disc "grabs" a workpiece and throws it backwards in the direction of rotation. Kickback is best prevented by using accurate alignment and the appropriate safety devices such as the upper saw guard and feather boards, and by feeding your workpiece into the cutter slowly without forcing and supporting the workpiece properly.


Kiln

In lumber drying, a kiln is a room or building where temperature, moisture, and the amount of air circulating are controlled to dry wood.


Kiln Dried

Lumber that has been dried in a Kiln. (See Kiln)


Knockdown

A design feature that allows a piece of furniture to be easily disassembled by the use of special hardware or joinery.


Knot

A part of the tree where a branch has been overgrown by the tree and incorporated into its trunk.


Knots

Caused by a dead branch that was not fully integrated into the tree before it was cut down. A looses knot that cannot be relied upon to remain in place in the piece. A tight knot fixed by growth or position in the wood structure so that it firmly retains its place in the surrounding wood.