Drills [kiri]
Kiri
Kiri
The kneading cone is a tool for opening a hole while the round-trip rotational motion is carried out. On the other hand, the ballet Drills and Kuriko Drills are tools for continuous rotation and opening holes. These Drillss were one of the tools that came in along with Western mechanical technology from the end of the Tokugawa period to the Meiji era. Ballto Drills is a tool called Screw Auger in English, with a blade tip at the tip and a spiral axis can easily discharge chips. The bolts and nuts that pass through this hole are also spiral-shaped screws. Looking back on the occurrence of screws, it is believed that in West it was invented by the Pythagoras philosopher and mathematician Alkitas (around 400 years ago). Specifically, a cylindrical screw is drawn on a compressor in a fresco painting at the site of Pompeii.
In Japan, spiral-shaped Drills is seen in ancient times, but it seems that it has not been applied to the idea of screws. Ballto Drills is used by rotating the handle attached to T-shaped. Kuriko Drills is the Drills that makes this rotation more smooth. It seemed to have entered at the end of the Tokugawa period, and in the Meiji era it was also called a curved pattern (brace) Drills and a cutting edge was called a chisel Drills (bit). It is the wisdom of the West that the crank shape is advantageous for giving continuous rotation. It is reported that the invention of the Kuriko Drills was made in Western Europe in the 15th century. It seems that the Japanese, which is called screws and crank shape, were not sensitive to rotational motion. However, what was the surprise of the Japanese at the time of seeing these? I think I was greatly inspired by my ingenuity.
In Japan, we traditionally used hand-rubbed Drills when drilling nail holes, but in the Meiji era, when a bolt-based bonding method was introduced along with Western-style architecture, screw-shaped vault Drills began to be used, which made thick and deep holes.
Special Exhibition
Permanent exhibition