Some species must be processed according to special rules.
Tropical hardwood machined lumber products grading rules.
Earl klinea philip a.
Visual requirements for this type of lumber are developed by the respective rules writing agencies for.
Additionally the rules were developed with random width and length lumber in mind.
At timber holdings we sell two grades of lumber.
Hardwood grading associations in united statesa name and address species covered by grading rules products national hardwood lumber association p o.
Other than the fas grades the grade of the board is determined from the percentage of these clear cuttings and do not consider defects outside of the clear areas.
A very simplified condensed overview of the steps for grading a piece of hardwood lumber is as follows.
Example of hardwood grading for cuttings using no.
Evaluation of an automated hardwood lumber grading system d.
Measurement the nhla grades are determined on an imperial measurement system using inches and feet.
The hardwood grading rules are quite complex and require study.
Tropical hardwood machined lumber products grading rules.
Sm is the width in inches and fractions times the.
Araman b chris surak c a department of wood science and forest products virginia tech blacksburg virginia 24061 usa kline vt edu b usda forest service southern research station thomas m.
The grading and measurement of hardwood lumber is not a simple matter and should not be undertaken lightly.
Pdf only or duplicate copies.
Determine the surface measurement sm.
Standards jointly adopted by the iwpa lumber products committee the malaysian timber industry board and the malaysian wood moulding council to establish quality levels for premium standard and utility grades.
The national grading rule establishes the lumber classifica tions and grade names for visually stress graded dimension lumber table 6 2 and also provides for the grading of dimension lumber by a combination of machine and visual methods.
Current grading rules are written only in the inch pound system of measurement.
Brooks forest products center blacksburg virginia 24061 usa paraman vt edu c american wood preservers institute.
A constant review and study of the individual rules is advisable even by those who are constantly using them.
1 common lumber grade.