Welcome! This is the official online shop of Hiroyuki Oka, a craftsman specializing in traditional Japanese puzzle boxes (Himitsu-Bako).

Key Points for the Top Panel

Key Points for the Top Panel
The first weekend of July has arrived, but the rainy weather is still continuing. The rain that was falling this morning stopped by noon, and in the afternoon, the weather kept changing between sunny moments and cloudy skies. There are still not many days when the humidity goes down, but I am moving the work forward little by little while watching the weather.

Today, I mainly worked on the 5-sun 7-steps puzzle boxes. I would like to finish these boxes first, and then move on to the 3-sun 12-steps puzzle boxes. Today, I completed the Aruki sliding panels that I had been working on yesterday and attached them. I was a little worried that the humidity might be too high, but it was not that high inside the workshop, so I decided to continue the work. Since this is a 7-steps mechanism, I only need to attach two panels. These two panels are independent from each other and do not interlock. After the side Aruki panel moves all the way, the large top Aruki panel can move. The top panel only moves one step. In a way, this 7-steps mechanism is the simplest mechanism and is easy to make. Actually, it may even be easier to make than the 4-steps mechanism, which has fewer steps. In the 4-steps mechanism, three panels move, and some parts of the panels interlock with each other. That part needs a little delicate adjustment. If it is the traditional 7-steps mechanism that I wrote about the day before yesterday, it also needs more delicate adjustment. In that sense, this 7-steps mechanism may be called a simple type.

After that, I attached the top and bottom panels that I had made. This time, there are two types of panels: the ordered walnut type and the rosewood type, which will be for stock. However, the number is small, and there are only 10 rosewood type boxes. When making these panels, I make them while fitting them to the box body. But the box must always be one with the Aruki panels already attached. In other words, just the frame part is not enough. Once the frame part is assembled, it is possible to make the panels to fit it. However, the size can change very slightly between a frame only and a frame with the Aruki panels attached. If the Aruki panels move very loosely, there may not be much difference. But Aruki panels that have been carefully adjusted can widen the left and right sides of the frame just a little. This is really a very small amount. It may be about the width of one hair. Even so, the feeling when attaching the panels changes a lot. If possible, I would like to adjust the movement of the top panel not only with the movement of the Aruki panels, but also with the “tightness” of these outside panels. By doing so, the movement can be supported not only by the Aruki panels, but also by the outside panels. Then, even if one side becomes a little loose later, the panel will not become shaky, and the movement can still be supported.
Have a nice weekend!😊