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A substrate primer may also be used as a bonding agent between the adhesive and the substrate. Thicker edge bandings typically require a slight concavity to provide a tight glue line. The thickness can vary from .018 in (0.46 mm) to 0.20 in (5 mm) or even more. The machine that applies the edge banding is called edge bander.
This is the simplest and weakest joint. Of those, there is the a) T-butt, b) end-to-end butt, c) Miter butt and d) edge-to-edge butt. Lap joint: The end of a piece of wood is laid over and connected to another piece of wood. Due to a large surface area of long-grain to long-grain wood and glue surface coverage, this is a very strong joint. [10]
The tenon, formed on the end of a member generally referred to as a rail, fits into a square or rectangular hole cut into the other, corresponding member. The tenon is cut to fit the mortise hole exactly. It usually has shoulders that seat when the joint fully enters the mortise hole. The joint may be glued, pinned, or wedged to lock it in place.
A plain scarf joint A nibbed scarf joint A keyed, nibbed scarf, reinforced with fish plates and through bolts The scarf joint used on the beams above the post is known by its French name, trait de jupiter, or bolt-o-lightning joint.
Approximately 2.5 mm is trimmed off the top and bottom faces and 3.8 mm is trimmed off the sides to ensure a flat surface. [14] In some cases, when the lumber edges are not glued because they have an acceptable width tolerance, only the top and bottom faces are planed.
Glulam brace with plates used for connections Glulam frame of a roof structure. Glued laminated timber, commonly referred to as glulam, is a type of structural engineered wood product constituted by layers of dimensional lumber bonded together with durable, moisture-resistant structural adhesives so that all of the grain runs parallel to the longitudinal axis.
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