It is a cylindrical fixture used to confine drilling and tapping tools or milling tools on the spindle of a drilling, tapping, milling machine or machining center. It is also called an ER collet. It can also be used to fix and reinforce a fixed locking device that needs to be modified and processed.
ER spring chuck has large clamping force, wide clamping range and good accuracy. It is widely used in boring, milling, drilling, tapping, grinding and engraving.
ER chuck is a kind of collet chuck, generally used in conjunction with CNC tool holders
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