How to Biscuit Joint Using the Makita PJ7000

A biscuit joint is a method of woodworking where two pieces of wood are joined together by inserting small pieces of wood into slots cut into both pieces.

The small pieces of wood are called biscuits and are held in place with glue, which in turn causes the wooden biscuit to expand, creating a snug, clean joint.

Who should know how to biscuit joint?

Anyone working with wood where the "mechanics" of the join need to be hidden. The two pieces of wood are butted together, and the method of joining them - the slots with inserted biscuits - is hidden.

Great for anyone looking for clean and tidily joined wood.

In this Toolstop #DIYTradetips guide we'll walk you through the simple process of making a biscuit joint using a power tools known as a biscuit joiner. For the purposes of our demo we'll be using a Makita PJ7000.

Blade Spec
hole created
Blade Teeth
100mm diameter
22mm diameter
Dust extraction and bag
4mm thick
22mm deep

6 pre-set cutting depths

Step 1

Preferably, depending on the material your using (in our demo we used contiboard), edge and size the two pieces you wish to join so that they'll fit snugly together.

Step 2

Line both pieces together and mark a pencil line across both. This will determine where the slots will be cut and the biscuits inserted.

Step 3

This step is crucial.

Based on the size of biscuit you're using, you need to set your biscuit joiner's depth stop accordingly. On the Makita PJ7000, turn the depth adjustment. In our demo we used number 20 biscuits. Therefore we set the PJ7000's depth stop to number 20.

Step 4

Adjust the base plate of your biscuit joiner so that it will cut into the centre of your workpiece. As above this is an important step as a centred biscuit join will improve the integrity and strength of the join.

Step 5

Start the cut.
As you do so, line up your pencil mark with the red line, as shown above. This will make sure your cut is absolutely centered.

Step 6

Insert the biscuits, one per slot on one of your pieces, with just a dab of wood glue. Then slide both pieces together.

Make sure you've put a dab of wood glue on the exposed side of the biscuits. This will make sure the biscuit is firmly glued into the slots on both work pieces.

That's it. Simple, easy and highly effective.

Of course it helps if you use a biscuit joiner that performs as well as the Makita PJ7000 in our demo, which you can watch on Toolstop TV.

If you'd like us to demonstrate the practical use of power tools, let us know in the comments or on Twitter using #DIYTradetips.

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