Method for determination of pith location relative to lumber sur

Details Method for determination of pith location relative to lumber sur Method for determination of pith location relative to lumber sur

1987-06-26

1989-05-16

Gruber, Felix D.

Boots, shoes, and leggings

144356, 250563, 356237, 36455101, B27B 100, G01N 2188, G06F 1546

Patent

active

048315451

ABSTRACT:
The invention is a method of assisting lumber grading using an electro-optical scanning system. A first critical determination is determination of pith position of the log from which the lumber was cut, relative to the scanned faces. This then indicates knot orientation. With knot orientation known, knot size and position data also determined by the scanning system can be used to accurately estimate cross sectional area of the knots. From this point a tentative lumber grade can readily be assigned. Pith position is indicated by a number of factors including wane, knot counts on each of the faces and the presence or absences of spiky faces. A preferred form of scanner is one which measures localized wood fiber angles relative to three orthogonal axes. These fiber angle measurements reveal grain slope disturbances on the lumber which are indicative of many types of defects including knots. The system has been used for grading lumber at speeds as high as 350 m/min. with considerable accuracy.

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American Society for Testing and Materials Publication D245-81, (Grading of Lumber), Published May, 1982.

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