Marking Dovetails and Box Joints like a Pro

Dovetails and box joints stand centre stage when they are used. When they are done right, they add an undeniable streak of class to your work. However, when they are done poorly, it can lead to sizable gaps that no amount of fillers, wood glue and sawdust are able to conceal.

So, what steps can be taken to ensure that you get the best possible result?

It should come as no surprise that tight-fitting joints begin in the marking-out phase of the process. Therefore, you mustn’t rush through this step. Check, double-check, triple-check if you need to— especially if this is your first time marking out dovetails or box joints. Major mistakes can be easily made if you’re unfamiliar with the process.

What tools do I need to make good-looking joints?

Some people may think that you need a shed-full of expensive and highly specialised equipment to get a good result. I can tell you that’s a myth. Dovetail joints have been used in antique furniture that predate even the earliest and most basic of electric wood tools by many thousands of years. I’ve found that you can produce high-quality joints with nothing more than a square, adjustable bevel, hammer, a sharp chisel, pencil and pencil sharpener. I would add a Stanley Knife or a box cutter to that list, and here’s why.

As sharp and precise as a pencil can get, it cannot hold an edge on wood like a razor blade. A dull, rounded pencil tip cannot get a tight line against the edge of the square or adjustable bevel. Further still, it produces a thick line that can leave you guessing where you should cut. Both of which can contribute to joints that are either too loose or too tight. Unlike a pencil, a razor blade is able to cut tightly against the ruler. It produces a mark so fine that it leaves no doubt where the cut needs to be made. Additionally, the mark leaves a small groove in the wood, which has two additional advantages. The first is that it provides a stable place to make your final chisel cut. The second is that by cutting the timber fibres, you reduce the chances of an ugly tear-out. Both of which will leave you with a more precise, professional-looking result.

Thanks so much for reading, and I hope that helps.