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hardwood_log_grades [2012/04/04 19:48] ddrummond created |
hardwood_log_grades [2012/06/06 19:01] (current) 128.192.48.16 |
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| ====== Hardwood Log Grades for Standard Lumber ====== | ====== Hardwood Log Grades for Standard Lumber ====== | ||
| + | Grading of logs is not so difficult as it appears although it does require | ||
| + | great care to make sure that no hidden defects are overlooked. After acquiring experience, | ||
| + | the grading of the log may be made while the volume is calculated. Even in the logs where | ||
| + | the grading cannot be made immediately, it is often necessary to design the different cuttings. | ||
| + | Usually measurements taken to determine whether the log will produce the minimum size required | ||
| + | per cut, are sufficient to determine the grading. Grad the logs in standing trees by following | ||
| + | the following rules and guides: | ||
| + | |||
| + | ====Rules for Grading Hardwood Logs (Standing Trees)==== | ||
| + | 1. Grade all logs in tree, third best face.\\ | ||
| + | 2. Grade as logs or half logs (log = 16 feet; 1/2 log = 8 feet).\\ | ||
| + | 3. End defects of logs are not taken into consideration.\\ | ||
| + | 4. Grade all logs to the top cutoff point.\\ | ||
| + | 5. Do not grade the long-butt or total cull portion of a log, | ||
| + | but do grade the remainder when equal to or more than 8 feet.\\ | ||
| + | 6. Do not grade logs that are obvious culls, but do tally them according | ||
| + | to their position in the tree. Example: 1 for the first log, 2 for | ||
| + | the second, etc.\\ | ||
| + | 7. Small bark distortion is a defect in logs whose diameter without bark (D.i.b) | ||
| + | is less than 15"\\ | ||
| + | |||
| + | ====Hardwood Log Grades==== | ||
| + | ^Grade Factors ^Butts ^Grade 1 ^Grade 2 ^Grade 3 | | ||
| + | ^ ^ ^Butts & Uppers ^Butts & Uppers ^ Butts & Uppers | | ||
| + | |Diam (min) |13"-15" |16-19" 20" |11" |8" | | ||
| + | |Approx DBH |16" |20" 25" |14" |10" | | ||
| + | |Lgth (min) |10' |10' |8-11' 12' |8' | | ||
| + | |Clear Cut'gs | | | | | | ||
| + | |(3rd best faces) | | | | | | ||
| + | |Length (min) |7' |5' 3' |3' |2' | | ||
| + | |Number |2 |2 |2 3 |unlimited | | ||
| + | |Clear Lgths in 16'|13'-4" |13'-4" |10'-8" |8-0" | | ||
| + | |Sweep |15% |15% |30% |50% | | ||
| + | |Cull |40% |40% |50% |50% | | ||
| + | |||
| + | EXCEPTIONS: | ||
| + | Ash & Bass 12" DIB grade 1 butts | ||
| + | Grade 2 10" DIB must be grade 1 surface quality | ||
| + | Grade 2 11" DIB limited to two cuttings | ||
| + | | ||
| + | Developed from FPL - D-1737 | ||
| + | |||
hardwood_log_grades.1333568937.txt.gz · Last modified: 2012/04/04 19:48 by ddrummond
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