Abstract. Increased problems of hardwood timber availability
have caused many sawmillers, industry analysts, and planners to recognize
the importance of sawmill conversion efficiency. Conversion efficiency not
only affects sawmill profits, but is also important on a much broader
level. Timber supply issues have caused resource planners and policy
makers to consider the effects of conversion efficiency on the utilization
and depletion of the timber resource. Improvements in sawmill conversion
efficiency would favorably impact sawmill profits, and would be equivalent
in effect to extending existing supplies of standing timber. An equation
was developed to estimate lumber recovery factor for hardwood sawmills
based on the characteristics of sawing machines and log resources.
Variables included in the model were headrig type, headrig kerf, average
log diameter and length, and the influence of total sawing variation. The
estimated coefficients significantly influenced lumber recovery factor.
The model should be helpful in assessing conversion efficiency trends and
potential benefits from gains in sawmill efficiency.