The term "tool" is generally used in the industry to refer to these accessories and cutting tools. By far the most popular type of the oldest and probably the votes in America is known as CAT. Invented by Caterpillar Inc. CAT has become the industry standard for CNC milling machines in the United States .. Cat Tools is available in a wide range of sizes: 30, CAT CAT CAT 40, 50, and so suite room. The numbers stuck on the end refer to the Association for Manufacturing Technology Taper size. For the purposes of this example, let's focus on -40. To further explore CAT, we have to mention the holder. CAT 40 holders are physical interface between the CAT and the machine itself. As its name suggests, CAT 40 holders are designed to fit 40 CAT tools. As CAT 40 tools are designed for a cone size, so that other types of tool holders; Thinning each size has a corresponding tool holder. In the most basic sense, CAT 40 has three main parts. The cone, clamp, and pocket clip up the majority of CAT 40 tool holder. The three parts of CAT tool 40 that work together to carry out its mission; in some cases, holders of 40 CAT tools can even be used to optimize performance and efficiency.