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Tips and tricks for joining stock with a biscuit joint

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Edge-to-Edge Joints:The most common type of biscuit joints are edge-to-edge joints. This is often used for gluing up table tops of various width boards of the same thickness, where biscuits are used along the planed long edges of the boards.

wood biscuits

 

To glue up a table top of various boards, lay out the boards side-by-side with each board's end grain turned in the opposite direction of that of the previous board. This will help keep the table-top stable when the boards expand or shrink.

wood gouge

 

Once the boards are in the proper positions, use a pencil to make marks across the joints every 4-6". These will be the centerlines for the biscuit slots.

blank wood signs

 

Next, separate the boards and adjust your biscuit joiner for the appropriate size of biscuit. In the case of edge-to-edge joints, you'll most likely use the large #20 size.

Placing the guide fence on top of the stock (perpendicular to the edge), align the cutting guide with the pencil mark. Hold the fence in place, start up the saw and once the motor is at full speed, smoothly plunge the blade into the stock until you can't push any farther. Then, retract the blade fully and repeat at the next mark.

Once all of the slots have been cut, place a small amount of glue evenly throughout the slots on one edge and insert the biscuits. Then, apply a similar amount of glue into the opposite slots on the other edge and connect the two boards.

You'll want to quickly glue up each edge of the table top and then clamp the entire assembly. Snug the clamps so that all of the gaps close completely, but be careful to avoid squeezing so hard that any glue in the joints is squeezed out. If any glue does squeeze out of the joints, be sure to wipe it off immediately to avoid affecting the finish later.

Other Biscuit Joints:You can use biscuit joinery for a number of different types of joints. Smaller biscuits work well for strengthening miter joints and corner joints. Biscuits also work well for T-joints, where the end grain of one board is connected to the side of another board.











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