To view a video of this exercise, click here.
For this exercise, you will need:
- Plane down two adjacent surfaces so that they are flat and straight and square to one another. These are now your ‘registration faces’ and will be the faces you register the stock of the square against each time. Mark them with a face mark and face edge symbol.
2. Register the stock of the square against the face edge, with the beam across the face- mark face, use the knife to create a knifewall across the face.
3. Turn the wood and flip the square so the stock is against the face- mark face and the beam is across the face- edge face. Rest the knife in the knife nick from the previous knifewall, slide the square up against the side of the knife edge. Use the knife against the square to make the second knifewall across the face of the wood.
4. Turn the wood so that the stock is registered against the face- edge face with the beam across the adjacent face. Rest the knife in the knife nick from the previous face, slide the square up and create a knifewall.
5. On the final face, flip the square and turn the wood. Register the square against your face- mark face with the beam across the last face, use the nick from face- mark face to rest your knife in, make the final line.
- If done correctly, this should line up exactly with your first line. If your lines are slightly off, this could be because you haven’t used your registration faces, or your registration faces are out of parallel. Always use the two proven registration faces for setting the square against as this guarantees a positive outcome.
- It is very important that this lines up exactly as if it is even 1/32” (~1 mm) out, you will have a gap in the shoulder lines of your joint which could make your project out of square and possibly unstable.
The gallery below shows what happens if you mark your faces without using the registration faces when the wood is planed out of parallel [Note: If you make your wood very out of parallel the effects will be exaggerated and you will be able to see why the line does not match up]: