As a mechanic, if someone tells you that he can drill square holes with a drill, I'm afraid most people will say it's nonsense! How does rotary motion produce a square outline? This is far from common sense and anti-science, but the significance of science is to solve all anti-science phenomena, which is the driving force for science to keep moving forward. Leroy Triangle was explored by Leroy, a famous German mechanical engineer, around 1875, and people found its infinite uses. Leroy triangle consists of three circles with the same size, which intersect at the three vertices of an equilateral triangle. Although Leroy was not the first person to put forward the graphic idea, or even to draw this graphic, he was the first person to show the world how Leroy's equilateral triangle should be applied to the mechanical structure in the real world. The drawing of Leroy triangle is so obvious that many modern researchers can't understand why no one made full use of it before Leroy.
Many patents of drill bits that can cut squares are related to Leroy Triangle, but the idea of cutting squares with drill bits is contrary to common sense from the beginning-how can a rotating drill bit cut holes that are not round? Leroy Triangle is not only used for other kinds of drill patents,
There are many incredible application scenarios by using the characteristics of its fixed-width curve.