Effect of Knife Jointing on the Gluing Properties of Wood
Keywords:Planing, knife jointing, gluing properties, sugar maple, red oak, spruce
AbstractJointing is a common practice required to produce the same cutting circle for all knives mounted in a culterhead of a peripheral knife planer. This practice also is sometimes used wrongly to refresh slightly dulled knives. Initially the jointed land at the cutting edge has a 0 degree clearance angle, which becomes negative with the workpiece motion relative to the cutterhead and as the cutting edge wears. The jointing operation potentially could crush a thin layer of the planed board and affect the wood quality and performance. The gluing properties of sugar maple, red oak, and spruce woods were evaluated using four jointed land widths. A wider jointed land affected the surface quality and resulting gluing shear strength differently depending on anatomical differences of the specific woods. The effect of knife jointing was more pronounced where the moisture content of the samples had fluctuated.
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