Influence of Cutting Velocity and Log Diameter on Tensile Strength of Veneer Across the Grain

Southern pine veneer bolts of 10- and 20-inch diameter were rotary cut at three different cutting speeds on a commercial lathe. Tensile strength across the grain of the veneer decreased with increases in cutting velocity. Veneer from 10-inch diameter bolts was weaker than veneer produced from 20-inch diameter bolts. Specific gravity was not the main contributing factor affecting strength of veneer when cutting variables were considered. The effect of cutting velocity on strength is probably related to the force exerted per unit time on the knife. The effect of log diameter on veneer strength is probably related to stress condition. Smaller diameter logs tend to produce poor quality veneer because large tangential stresses are developed when the forming veneer sheet is bent. This flexing action causes the lathe checks that weaken the veneer.

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