Introduction

Wood Joining Biscuits

Wood Joining Biscuits

Biscuits - or wafers made of compressed wood chips - are used to help join two pieces of wood.

©2007 Dorling Kindersley Limited

2007 Dorling Kindersley Limited

Though most often used for furniture, biscuit joints have many other applications. The joiner makes precise plunge cuts into each side of two pieces of wood that are butting up together. Then a "biscuit" (a wafer of compressed wood chips) smeared with glue is inserted with one side in each slot (see slide #3 to learn how).

Biscuit Sizes: Biscuits are commonly manufactured in three sizes for different thicknesses of board- 5, 10, and 20.

Step 1

Mark Biscuit Joint Position

Mark Biscuit Joint Position

Butt sheets of wooden countertop together, aligned as they will be joined, and draw a pencil line across the two sheets to mark the position of biscuit joint.

Photo by: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

DK - Do It Yourself Home Improvement, 2009 Dorling Kindersley Limited

Mark the Location of the Slots

Whatever you are making, you need to judge how many biscuit joints you need for a good connection. Thickness of the biscuit should be judged on wood depth. Butt the wood together, aligned where they will be joined then draw a pencil line across the two pieces to mark the biscuit joint's position.

Step 2

Set Joiner Level Adjustment

Set Joiner Level Adjustment

Set the level adjustment lever on the biscuit joiner according to the depth of the material, so the it will cut into the middle of the sheet of wood.

Photo by: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

DK - Do It Yourself Home Improvement, 2009 Dorling Kindersley Limited

Set the level Adjustment

Set the level adjustment lever according to the depth of the material, so the joiner will cut into the middle of the sheet.

Step 3

Adjust Biscuit Joiner Cutting Depth

Adjust Biscuit Joiner Cutting Depth

Use the cutting depth adjuster to set how deep the biscuit joiner will cut. It should be marked with the depths needed for standard biscuits.

Photo by: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

DK - Do It Yourself Home Improvement, 2009 Dorling Kindersley Limited

Set the Cutter Depth

Use the cutting depth adjuster to set how deep the biscuit joiner will cut. It should be marked with the depths needed for standard biscuits.

Step 4

Cut the Slots

Cut the Slots

Cut a slot in each piece of board by lining up the guide on the joiner with your guidelines, then pushing the cutter into the edge.

Photo by: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

DK - Do It Yourself Home Improvement, 2009 Dorling Kindersley Limited

Cut the Slots

Cut a slot in each piece of board by lining up the guide on the joiner with your guidelines, and pushing the cutter into the edge.

Step 5

Applying Wood Glue

Applying Wood Glue

Apply white wood glue to the biscuit. The water in this glue causes the biscuit to expand and fit tightly in its slot to make a very strong joint.

Photo by: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

DK - Do It Yourself Home Improvement, 2009 Dorling Kindersley Limited

Apply Glue To The Biscuits

Apply white wood glue to the biscuit. The water in this glue causes the biscuit to expand and fit tightly in its slot to give a very strong joint.

Step 6

Insert Biscuits

Insert Biscuits

Push one side of the biscuit into the slots in one section of material. Apply a thin bead of glue between the biscuits, down the length of the seam.

Photo by: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

DK - Do It Yourself Home Improvement, 2009 Dorling Kindersley Limited

Insert the Biscuits

Push one side of the biscuit into the slots in one section of material. Apply a thin bead of glue between the biscuits, down the length of the seam.

Step 7

Clamp Board Sections

Clamp Board Sections

Push the biscuits into the corresponding slot to join the two sections, then clamp.

Photo by: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

DK - Do It Yourself Home Improvement, 2009 Dorling Kindersley Limited

Complete the Joint and Clamp

Push the other end of the biscuit into the corresponding slot to join the two sections and clamp. Use a damp cloth to wipe away any excess glue.

Pro Tip

If you end up with a lot of glue squeeze out, it may be helpful to let it cure for 30 min. or so, then scrape of the slightly hardened glue.