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The Steps in Grading Hardwood Lumber |
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1 |
Determine the species....some
species have separate requirements from Standard NHLA Rules. |
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2 |
Determine the Surface Measure
using a board rule (Lumber Scaling Stick). Surface
Measure is always a whole number except with
exotic species. |
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3 |
Determine the "Best Face"
and the "Poor Face". |
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4 |
Assign a "trial" grade to
each face, based on your estimate of the yield of clear wood. |
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5 |
Determine the number of cuttings
permitted in your "trial" grade, keeping in mind the
minimum size of cuttings required for that grade. FAS
1 Face and Selects minimum cutting sizes are 4" x 5' and or 3"
x 7'. #1 Common minimums are 4" x 2' and or 3" x 3'. |
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6 |
Determine the Clear-Face cutting
units needed (Minimums for FAS 1 Face and Selects are
Surface Measure times 10 and for #1 Common is Surface Measure
times 8). |
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7 |
Calculate the total area of
Clear-Face cutting units on each face. |
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8 |
If the board does not yield
sufficient Clear-face cutting units of the right size and
number of cuttings, try the next lower grade. |
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9 |
Tally S.M. (Surface Measure)
by grade and thickness on basis of 1" (4/4) lumber. |