A biscuit joint is a reinforced butt or mitre joint. In principle, it is similar to a dowel joint, but instead of a round peg or dowel fitting in a hole, in biscuit jointing a flat oval plate (the biscuit) made of compressed beech is fitted into a matching slot. With the addition of water-based PVA glue, the biscuit expands to fill the slot, forming a very strong joint. The biscuit jointer itself is a small-scale plunge saw with a circular-saw blade, specifically developed for trimming panels or cutting grooves for drawer panels.

mitre joint t-butt joint edge-to-eoge joint corner butt joint

Types of biscuit joints

You can make corner- and T-butt joints, mitred and edge-to-edge joints, in both solid wood and man-made boards. Biscuit joints are mostly used for framing or in cabinetmaking.

2 Cutting corner-joint slots

Before making the cut, align the cutting guide (marked on the side of the fence) with the central point of each slot. Keeping the fence pressed against the edge of the wood, switch on and plunge the blade to cut the slot.

3 Cutting matching slots

To cut the other half of the joint, mark the matching biscuit-slot centres on the end of the second workpiece, and clamp it on a flat surface. Turn the guide fence over and lay the jointer on its side, then adjust the fence to centre the blade on the edge of the workpiece.


Mitred corner joint

1 Marking out a corner butt joint

Draw the centre line of the joint on the work, then mark along it the central point of each biscuit slot, spaced about 100mm (4in) apart. Set the cutting depth of the blade to match half the width of the biscuits being used, and adjust the tool's fence to align the blade with the marked centre line.

Types Biscuit Joints

biscuit-slot centre centre line biscuit-slot centre centre line

Router Jig Plans

Making a T-joint

Mark the centre line of the joint across one board. Use the end of the second board, clamped on its side, as a fence to align the jointer's blade with the marked line. Plunge each slot in turn. Without moving the second board, cut matching slots in its end (see page 23).

Was this article helpful?

0 0
Woodworking Tools and Installation Tips

Woodworking Tools and Installation Tips

There are a lot of things that either needs to be repaired, or put together when youre a homeowner. If youre a new homeowner, and have just gotten out of apartment style living, you might want to take this list with you to the hardware store. From remolding jobs to putting together furniture you can use these 5 power tools to get your stuff together. Dont forget too that youll need a few extra tools for other jobs around the house.

Get My Free Ebook

Post a comment