The holding head usually uses collets that hold the tool in place, providing concentricity of the cutting tool, as they wrap around the circumference of the tool.
The Morse taper (male part) fits in the spindle’s female coupling, providing precise positioning of the tool and the ability to change it quickly. They consist of a taper (shank) and a holding head (flange). They will accept both imperial and metric-sized tools. The higher the number, the bigger the taper.ĬAT tools are also known as Caterpillar “V-flange.” CAT tool holders are designed as flexible devices that will accommodate different tools within a certain range of sizes. The number represents the size of the taper holder, which is standardized by the Association for Manufacturing Technology (AMT). Well-known among professionals and widely-used, CAT tooling can be found in different sizes: CAT30, CAT40, CAT45, CAT50, CAT60, etc. The difference between CAT and BT is the flange style and thickness, as well as the thread for the pull stud being a different size.ĬAT tooling uses Imperial (US customary) thread pull studs (retention knobs). CAT tapered tool holders are similar to BT tapered tool holders. Purpose and FunctionalityĬAT tool holders accept both Imperial and Metric-sized tools. These tools were developed by an American company, Caterpillar®, and are used in CNC machinery. One of the most common standards of tool holders is CAT. The cutting tool is mounted into the holder and then tightened so it does not move during machining. A tool holder is a device that holds the cutting tool in the spindle of the machine safely.
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