What is the effective way to choose the right spring collet?

July 13, 2021

Er spring chuck system has been widely used in machine tools all over the world due to its good scalability and good accuracy. As a tool to use spring collet every day, how to select and install each component correctly is very important. However, whether you are a senior engineer or a cute new person, you may think about a question more than once: "am I using the right chuck?" It's true that different sizes and forms of collets often cause certain troubles when people use them. Under which circumstances can we know that the collet is suitable? Today I'm going to raise the position of "Chuck" for you. First of all, how do you know the size of the ER bit you are using? It can be obtained by simply measuring the inner hole of the cutter head. For example, the measurement result in the figure above is 32mm. Therefore, this is an er32 cutter head. According to the different cutter head, we need to choose the corresponding spring collet, which is the basic collet type. According to your needs, choose high precision or affordable. I chose the second one, the one with a small beat. Can I put my knife in? Er32's chuck can fit a 20 mm hilt at most, and my cutter can just fit in. With the chuck, how to choose the nut? High speed dynamic milling, so I'm the second, low friction nut.

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