. Lumber recovery from ponderosa pine in the Black Hills, South Dakota. Lumber; Ponderosa pine South Dakota; Ponderosa pine Black Hills (S; D; and Wyo; ). Lumber Recovery Factor The relationship between LRF and log diameter for data from both mills is shown in figure 2 and table 2. The trend is similar to that of CR% where there is a slight increase with increasing log diameter. Lumber recovery factor was BF of lumber per CF of gross log volume for 5-inch diameter logs and gradually in- creased to for 19-inch logs. 10 - 9 -. E 3 - 3 2 - . : 1 - 0 I i i iâiâiâiâ' 1âiâIâiâiâiâiâIââ â'ââ
. Lumber recovery from ponderosa pine in the Black Hills, South Dakota. Lumber; Ponderosa pine South Dakota; Ponderosa pine Black Hills (S; D; and Wyo; ). Lumber Recovery Factor The relationship between LRF and log diameter for data from both mills is shown in figure 2 and table 2. The trend is similar to that of CR% where there is a slight increase with increasing log diameter. Lumber recovery factor was BF of lumber per CF of gross log volume for 5-inch diameter logs and gradually in- creased to for 19-inch logs. 10 - 9 -. E 3 - 3 2 - . : 1 - 0 I i i iâiâiâiâ' 1âiâIâiâiâiâiâIââ â'ââ âiâJ 0 5 10 15 20 Small-end diameter (inches) Figure 2.âLumber recovery factor by scaling diameter for combined data from two sawmills. The recovery factor is for mill-length logs and is based on gross cubic foot volume of logs: y = - (1/c0 + (1/d2) . Coefficient of determination = and standard deviation from regression = Recovery Percent Overrun is the common term used to describe the amount of lumber recovered (Overrun) that is in excess of the net log scale and is expressed as a percentage of the log scale. Recovery percent is often confused with overrun, but it is lumber tally divided by net log scale. A recovery percent of 150 would be equal to 50 percent overrun. Recovery percent is the term used in this report: _ . lumber tally . .nri Recovery percent = ââ. Jâ X 100 . net log scale The relationship of recovery percent to diameter (based on Scribner board foot scale) is shown in table 3 and figure 3. The trend shows a steep decline from 151 percent at 5 inches to 117 percent at 12 inches, and falls gradually to 108 per- cent at 19 inches. This overall reduction of recovery percent with increasing log diameter is typical of mills that produce nominal 1-inch lumber. The statistical relationships between recovery percent and log diameter, although not strong, are significant. Estimates of recovery percent should be made by di
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