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Calc.O−DWeight=⎡ (wetweight,Step5 ) ⎤x100 ⎢⎣100+(%MC,Step10 )⎥⎦ 12. Write the estimated O-D weight on the sample board (when it is weighed the next time) so that this number is readily available. 13. Periodically reweigh the sample board to obtain a new current moisture content. Current %MC = ⎡ Current Weight, Step 13 ⎤ - 1 x 100 ⎢⎣Calc.O − DWeight,Step 11⎥⎦ 14. Occasionally, it is necessary to cut new sample boards when the lumber is at 20% MC to obtain more accurate MC values (that is, to make a mid-course correction). To do this, cut one new moisture section 6-inches from the end of the sample board. Then follow Steps 3 through 13, except only one section is used. The "wet weights" in Steps 10 and 11 are the weights determined after the sample and new section are sawn. Checking the Quality of Incoming Lumber When lumber is purchased, we always double check the grade and footage, but seldom is the quality checked. That is, the lumber is not checked for surface checks, end checks, and internal checks. The procedure for evaluating quality is illustrated in Figure 3. It might be surprising how often the cause of checks and honeycomb noted after drying is not the fault of the predryer or kiln operator. Rather, the lumber was received with checks already in it. Further, if lumber is already checked, a different schedule must be used. 36PDF Image | Principles and Practices of Drying Lumber
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