Influence of Machining Parameters on the Tensile Strength of Finger-Jointed Sugar Maple Lumber
Keywords:Finger-jointed lumber, machining, engineered wood products, sugar maple, hardwood
AbstractPresently, finger-jointed softwood lumber is used in manufacturing of structural engineered wood products such as glued laminated (glulam) beams and prefabricated wood I-joists. However, the use of high-density hardwoods appears to be an attractive alternative material to achieve a higher performance of these products. Certain machining parameters have to be controlled in order to produce suitable gluing surfaces and to optimize the finger-jointing process. The main objective of this study was to evaluate the effect of machining parameters on the ultimate tensile strength parallel to grain (UTS) of finger-jointed sugar maple dimension lumber. Three different chip-loads and three cutting speeds were used as variables. Based on test results, the cutting speed appeared to influence the UTS the most. The best average UTS (47.1 MPa) of finger-jointed sugar maple specimens was achieved with a chip-load of 0.60 mm and a cutting speed of 2726 m/min (rotation speed of 3250 RPM and feed speed of 11.7 m/min).
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