Simple Edgetoedge Joint

You will need to know how to use this or one of the other methods of jointing edge to edge because of the difficulty of obtaining good quality wide boards.

If the planks that have been purchased are planed there is a good chance that only minor adjustments will be required to get a good fit. One of the difficulties in gluing this kind of joint is that the planks can slip out of alignment when under pressure from the clamps. Minor misalignments can be planed away when the glue has dried, but any major errors will ruin the board. Battens are often fitted to strengthen the board if it spans a wide, unsupported area.

FIG 4.8

Making a simple edge-to-edge joint with a batten.

3 Battens are fixed to the back of the compound board to add strength and keep it flat. Screws are used in preference to glue; the boards will change size across the grain with changes in the humidity, and if glued securely the wood could not move and might split. The screws are fitted into slots rather than round holes in the batten to allow for this movement.

1 To minimize warping, arrange the planks to be jointed so that the growth rings on the end grain are placed alternately. Indicate with identification letters which pairs of edges fit together. With the pairs of edges placed together AA, BB etc., plane both pairs of edges square and flat, so that they match when joined.

2 When gluing, apply the adhesive to one edge only and rub the two edges together to spread the glue. When clamping, alternate the positions of the clamps so that they are on both faces of the board.

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