Influence of Log Length and Taper on Estimation of Hardwood Bof Position


  • Rugeng Shi
  • Philip H. Steele
  • Francis G. Wagner


Log length, log taper, BOF position, sawing patterns


The influence of log length and taper on hardwood BOF position by a centered-solution method was determined. A regression equation was developed to estimate opening face position as a function of the explanatory variables: centered-solution position, difference in T2 and T1 thickness, and log length and log taper. Coefficients of these explanatory variables were significant. However, examination of sums of squares showed that the centered-solution position adequately estimated BOF position. Tests of the power of the reduced equation proved it to be accurate in estimating BOF position and that average loss in board foot yield was less than one-half percent. These results show that a single equation based on the variable centered-solution position can accurately estimate BOF position for all length and taper classes of sawlogs.


Adkins, W. K., D. B. Richards, D. W. Lewis, and E. H. Bulgrin. 1979. Programs for computer simulation of hardwood log sawing. Res. Pap. FPL 357. USDA Forest Serv., Forest Prod. Lab., Madison, WI.nLewis, D. W. 1985. Yield losses from sawmill scanner error. Res. Pap. FPL 459. USDA Forest Serv., Forest Prod. Lab., Madison, WI.nNational Hardwood Lumber Association. 1982. Rules for the measurement and inspection of hardwood and cypress lumber. NHLA, Memphis, TN.nRichards, D. B., W. K. Adkins, H. Hallock, and E. H. Bulgrin. 1979. Simulation of hardwood log sawing. Res. Pap. FPL 355. USDA Forest Serv., Forest Prod. Lab., Madison, WI.nSteele, P. H., and E. M. Wengert. 1987. Simplified procedure for computing best opening face position. Forest Prod. J. 37(5):44-48.nSteele, P. H., R. Shi, and F. G. Wagner. 1989. BOF decisions for an asymmetric sawing pattern. Forest Prod. J. 39(6):15-20.n






Research Contributions