Sawing Pattern and Bolt Quality Effects on Yield and Productivity from Yellow Birch

This article deals with sawing pattern and bolt quality effects on the average yield of unedged boards and semifinished furniture component and on the average board productivity obtained in processing yellow birch (Betula alleghaniensis Britt.) bolts in one company. The investigation dealt with the short-log carriage and rough mill operations of one company only. The regression equations can be compared with those obtained under somewhat different conditions in other companies. Among bolt characteristics used, bolt diameter, length and scaled defect provided acceptable estimates of unedged board and component yield per bolt and of sawing productivity for both Live- and Taper-sawn samples. Exterior bolt quality as expressed by the number of clear faces influenced unedged board dollar value per gross cubic foot of bolt volume and per minute of sawing time for Live sawn bolts. It also directly affected component value per gross cubic, foot. Although little difference in average board and component yield between Live- and Taper-sawing was indicated, performance of Taper, relative to Live improved as scalable bolt defect increased. Sawing productivity was considerably greater for Live than for Taper-sawing. Live-sawing generated an average of 40 percent more board area per minute and 24 percent more board dollars per minute of productive sawing time than did Taper-sawing.

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