Two-Dimensional Geometric Theory for Maximizing Lumber Yield From Logs

Authors

  • Yage Zheng
  • Francis G. Wagner
  • Philip H. Steele
  • Zhendong Ji

Keywords:

Log breakdown, log sawing algorithm, cant sawing

Abstract

A two-dimensional geometric theory for maximizing lumber yield from logs was developed. Centered cant sawing solutions for both circular and elliptical shaped logs were derived. Sawline placement for maximum yield is dependent upon the diameter of round logs or upon the cross-sectional axis of elliptical logs. The width of the face of the cant is equal to 0.707 times the diameter or parallel-axis of the log. Slab thickness is equal to 0.147 times the diameter or perpendicular-axis of the log. It assumes circular and elliptical log shapes and provides a method that may substantially reduce computation time when applied to computerized log breakdown decisions.

References

Hallock, H., and D. W. Lewis. 1971. Increasing softwood dimension yield from small logs—Best opening face. USDA Forest Service Res. Pap. FPL 166. Madison, WI.nHallock, H., and D. W. Lewis. 1976. Is there a best sawing method? USDA Forest Service Res. Pap. FPL 280. Madison, WI.nSteele, P. H. 1984. Factors determining lumber recovery in sawmilling. USDA Forest Service Gen. Tech. Rep. FPL 39. Madison, WI.nSteele, P. H. and F. G. Wagner. A model to estimate regional softwood sawmill efficiency. Forest Science (in press).nSteele, P. H., E. M. Wengert, and K. Little. 1987. Simplified procedure for computing best opening face. Forest Prod. J. 37(5):44-48.nZheng, Y. G. 1979. Research on sleepers and lumber sawn from elliptical logs by rational sawing practices. Industry of Forest Products. Peking, China.n

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Published

2007-06-22

Issue

Number 1 / January 1989

Section

Research Contributions

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