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منذ تطورها في 1973, أصبحت ER Collets عنصرًا أساسيًا في كل متجر للآلات. Whether you’re looking to hold tooling or even round stock, these collets are an industry-standard for machine work.
STANDARDS OF ER COLLETS
These collets are usually found in a standard series as: ER-8, ER-11, ER-16, ER-20, ER-25, ER-32, ER-40, and ER-50. The numbers represent the opening diameter of the tapered receptacle in millimeters. As you tighten the nut on your holder, the ER collet collapses together to hold round tools or stock from 0.5-2 مم (أو 0.0197-0.0787 in., depending on collet size) smaller than the collet internal diameter.While the initial ER system is based in metric, there are ER collets available with imperial sizing as well.
WHAT SIZE ER COLLET DO I NEED?
The short answer to the question, “what size ER collet do I need?” is: the whole series. The real strength of ER collets is that they collapse down to fit whatever you’re trying to hold, but a single size can’t hold everything.
Because the diameter only collapses down from 0.5-2 مم (depending on the collet size), having a set sized in a variety of increments allows you to hold any tool in the collets series clamping range. Keep in mind that the closer your tool is to the nominal collet size, the more accurately it will clamp it, so having those intermediate sizes can prove helpful, especially when you are using ER collets to hold drills. Run out is important in a drill situation, and having a collet as close to your drill size will help you keep your run out to a minimum .
Having a large array of ER collets is important. They are a very versatile holder offering a wide clamping range. Other tools holders like the set screw, heat shrink, or milling chucks can offer you an even higher level of rigidity and precision, but don’t offer this versatility since they are limited to a single size.