Effects of Knife Jointing and Wear on the Planed Surface Quality of Northern Red Oak Wood

Jointing is a technique to obtain the same cutting circle for all knives mounted in a cutterhead of a peripheral knife planer.Initially the jointed land at thc cutting edge has a 0 degree clearance angle that becomes negative with workpiecc motion relative to the cutterhead and as the cutting edge wears.Jointed knives may crush cells on the planed surface and affect the quality and performance of wood for end ~lscs.Wc evaluated the gluing properties of northern red oak planed surlhceh that had been planed using one of three jointed land widths, over four levels of knife wear.Under these cutting conditions.surface roughness significantly influenced gluability more than cellular damage.In sum, gluing performance was positively affected by knife wear, and no variation in gluing performance iumong the jointcd land widths studied existed.In samples after accelerated aging, the effects of wear on gluing were more pronounced, with an improvement in gluing performance, associated with an increaw in surface roughness and permeability with increased knife wear.These results suggest a jointed land of 1.2 tnm as the maximum allowable width for planing red oak wood prior to gluing.Also.thc planed surfacc gluability of this wood may be enhanced using a knife with the rake face recession of 132 pm and the clearance face recession of 438 pm, which results in a surface roughness ol' 10 prn R ,,,,,,.Kr\.n,o~.rl\:Planing.knife iointing.wear.gluing properties, northern red oakJointing is a common practice applied to peripheral knife planers to produce an equal cutting circle for all knives mounted in a cutterhead.An abrasive stone is passed over the knife edges as the cutterhead turns at its normal cutting speed.Any projecting knife edge is ground back.ensuring that all the edges lie in a common cutting circle.Thus, each knife can work in a uniform manner taking chips of equal thickness (Dunsmore 1965;Hoadley 2000).Jointing makes knife edges more wearresistant, and it is sometimes wrongly repeated as a sharpening process.' Mcmbcr o l SWST.

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