If you know a bit about machine tools, you’ve probably heard of the tool holders that are responsible for aiding the machine’s moving parts. Collets are a type of tool holder that are able to grasp all different types of cutting tools and help them operate for high-speed, high-volume productions. A collet works by using a tapered outer collar, which it uses to clamp a tool or workpiece, similar to the chuck used to hold a drill bit into a drill.

If you’re wondering about what a collet can do, how it works, and what types of collets there are, keep reading to find out the answers to these frequently asked questions.

What is the difference between a chuck and a collet?
There isn’t much difference between the two in terms of theory. In fact, a collet is actually a type of chuck. But when comparing something like an ER collet to the chuck on a drill, there’s a world of difference. The ER collet is the most widely used clamping system in the world. These tool holders are used on CNC machinery, which operates by computer, as opposed to a chuck on a drill, which works on hand tools.

What varieties of collet are there?
There are several different types of collet, and most are broken down into two categories: internal and external. An external collet is more typical and will squeeze around a tool or workpiece to hold it in place — effectively forming a collar around it. An internal collet, however, does the opposite, and fits into another telescoping tube. This type of collet is typically threaded to fit with the tool or other object.

Are there any other types of collet used in large productions?
The collet has all kinds of uses, and it’s not only used in manufacturing. The collet is used in metalworking and woodworking. Other types of collet include those for ER, Autolock, R8, and 5C systems. A collet is also found in hobbyist tools, like X-Acto knives and Dremels. Collets are also found in internal combustion engines and in semiconductor work to create electronics.

If you have other questions about tool holders, especially the collet, make sure to direct your questions to a qualified CNC machine manufacturer. You can also leave a comment below if you have general questions or suggestions on where to look for more info on tool holders.