The use of a chisel is listed as one of the difficult carpentry tasks, and is commonly referred to as "three years of hole drilling."

Since many tools are required for the chisel work, it is important to secure their place in advance and be careful not to get mud etc. To take the posture, usually sit on the right side of the material, and keep your right foot on the right side. It is said that it is better to apply Genno from the shoulder, swing it around the outside, and swing it down, and it is not a carpenter's skill to swing it vertically or hit it horizontally.

When using a chisel, it is important to consider the nature of the target material. When digging a hozo hole, consider the grain and use the type of chisel and the power to add. Use a thick chisel with a chisel when cutting a wood grain (Fig. A to B on the right), and use a wide chisel with a wide chisel when chiseling along the wood grain (B to C), so that it does not break outside the ink. Also, pay attention to the front and back of the material as shown in the figure on the right, and proceed with the chisel while predicting the direction of cracking.

The procedure for digging a hole is first chiseled along the ink as shown in the figure below, and then cut the mouth from a little inside and start digging. This is because if you drive strongly along the ink from the beginning, you may be squeezed by the cutting blade and make the hole larger than the required size. Next, put a blade in the center and dig into a V-shaped shape. Finally, carefully cut along the ink with a finishing chisel. The point that should be noted in the drilling work is to dig up while constantly conscious of the true ink of the material so that the position and shape of the hole are always correct. It is necessary to always check in the Ruler etc. so that the hole does not bend with large materials.

The drilling task is to dig about 40 holes a day, so you have to hit the chisel efficiently with great power. The chisel is made sturdy so that it can withstand it.