Dimension Stock Yields from Lumber of Three Hardwood Species

The method of obtaining hard maple (Acer saccharum Marsh.), black walnut (Juglans nigra L.), and red alder (Alnus rubra Bong.) dimension stock yield data is illustrated by the use of a nomograph. Application of the data is useful in determining the yield of a specific cutting order from each lumber grade and grade mix, in determining the most economical grade or grade mix by comparing product needs with raw material requirements for each combination, and in providing a standard by which management can evaluate the efficiency of their production. Total yields down to a 1- by 10-inch cutting from 4/4 lumber of the three species ranged from 51 percent in N3aC to 79 percent in FAS maple, 55 percent in N2C to 76 -percent in FAS walnut, and 57 percent in N2S to 73 percent in SE1 & Btr alder. Comparisons of the results to actual production runs indicated that the yield data was well within 5 percent tolerance limits. Exceptions that require adjustments in the data such as additional grading specification, species differences, and the influence of lumber of thickness is discussed. Two major areas of responsibility with specific recommendations are suggested which will maximize rough, mill efficiency with an accompanying increase in yield. Several methods of arriving at total costs are discussed. Related research from innovative breakdown patterns to unconventional sawing methods and automated cutting systems are reviewed.

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