Vimos en una entrada anterior cómo cortar los dientes y los huecos de la unión de lazos rectos en la primera tabla. Ahora voy a utilizar esa primera tabla ya cortada, para marcar el tamaño de los huecos que tengo que cortar en la segunda tabla, para hacer esta unión de madera tipo dedos rectos.
I’m going to put the end of the first board on the side of the second board flush whith the border. And I mark the depth of the sockets I have to cut. And now, by placing on the second board the sockets and the pins that I have already cut in the first board (1), I can mark the size of the pins that I have to leave and the sockets that I have to cut in the second board.
As we can see in the picture, the lines that I draw belong to the pins that I should leave, so I should avoid cutting on those lines.
Then, with the dimensions of the pins and the sockets that I have already marked, I draw a mess line on the wood I want to eliminate (the sockets), and I draw a “V” on the wood I want to leave (the pins). In addition, I am going to draw a small triangle on the side of the lines that is in the area of the mess line (in the area of the sockets). I want to cut next to the lines and in the area where I drew the triangle (2), the side of the mess line. Once I have marked what to cut and where to make the cuts, I extend the lines on the head of the board (3), and on the other side of the board (4). In addition, I have to extend the depth line of the cuts (5) to the sides.
Con todas las líneas marcadas y teniendo bien claro en donde voy a cortar, coloco la tabla en mi tornillo de banco casero y empiezo a cortar siguiendo el mismo procedimiento que utilicé, al cortar los dientes y los huecos de esta unión de lazos rectos, en la primera tabla: realizo todos los cortes desde una cara con la sierra inclinada (6); realizo todos los cortes desde la otra cara con la sierra inclinada (7); termino de realizar los cortes con la sierra horizontal (8); y elimino la mayor parte de la madera de los huecos con la sierra de marquetería (9).
Now, as I did with the first board, I have to adjust and clean the base of the sockets using a chisel (9b). Then I can start adjusting the width of the sockets so that the pins of the other board fit perfectly to make a nice box joint.
With the chisel vertical and close to the line, but not on top of it, I will cut vertically downwards. I start by marking on the side of the line (10a), I cut slowly downwards (10b), and finish cutting when reaching the base of the socket (11). I cut the shavings at the base (12) and do the same next to the rest of the lines.
Once all the cuts have been made, the next step is to test how the joint fits, and to use the chisel to make the necessary adjustments until the box joint fits perfectly. The trick is to make sure not to over-cut at any time, and to use the chisel to gradually approximate the size of the sockets until the pins of the other part of the box joint fit perfectly.