Assuming that the prices paid for F2 and F3 yellow poplar logs were $150/MBF and $140/MBF in Doyle log scale, the purchase prices for red oak logs were $300/MBF for F2 grade and $280/MBF for F3 grade, and the average operating cost ranged from $160/MBF for circular sawmills to $200/MBF for band sawmills, a value ratio was computed based on species, diameter classes, and sawmills (Fig.
logs lumber tally ($/MBF) Red oak 10 22 485 11 16 422 12 30 420 13 26 446 14 27 454 15 29 469 Yellow poplar 10 7 341 11 9 304 12 20 301 13 18 334 14 12 326 15 14 357 Dollars per Dollars per hundred cu ft of thousand bd ft of Species net log scale ($/CCF) net log scale ($/MBFLS) Red oak 320 782 264 639 267 620 286 584 291 607 304 557 Yellow poplar 240 518 206 452 205 442 228 474 225 421 254 467 (a) SED = small-end diameter (inside bark); bd ft = board feet; cu ft = cubic feet.
Understanding log scales and log rules, http://www.
To calculate LO, the volume of lumber produced (expressed in board feet lumber tally) in excess of the Scribner log scale volume processed was divided by the Scribner volume of logs and expressed as a percentage.
Measures of the volume of lumber produced per unit of log input can be influenced by a range of factors in addition to log scale.
Percentage sweep log scale deduction was utilized in this study to support the evaluation of the degree and frequency of sweep in hardwood logs by categorizing, evaluating, and comparing the potential effects of sweep on lumber recovery in a typical straight sawing hardwood sawmill environment.
Thus, only those logs with 5 percent or more log scale deduction were further analyzed.
To determine the effect of log diameter on sweep log scale deductions, log diameters were divided into two classifications: small-diameter logs (SED [less than or equal to] 12 inches) and large-diameter logs (SED > 12 inches).
The log scale deduction is greater for small-diameter logs with measurable sweep.
Log length had little impact on the percentage log scale deduction for the 528 study logs with measurable sweep.
For the 32 percent of logs with measurable sweep, the average log scale deduction for sweep was 13 percent.