Effect of Lathe Settings on Veneer Yield

An experimental program was carried out to investigate the major interrelated effects of three lathe variables – vertical gap, horizontal gap and knife angle – on the yield, grade and gluability of 1/10″ Douglas-fir (Pseudotsuga menziesii (Mirb) Franco) veneer produced on a normally maintained industrial lathe. Lathe settings that were intermediate in the factorial study gave the best results, showing a 6.9 percent increase in total usable veneer from 80.4 percent to 87.3 percent and a 10.2 percent increase in yield of wide veneer from 45.4 percent to 55.7 percent as compared with the Control lathe settings being used by the mill. Veneer from all lathe settings tested was satisfactory from the standpoint of thickness variation. Gluability of veneer produced with the lathe settings which gave the highest yield was equal or better than the gluability of veneer produced with the Control settings.

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