Information AboutCollet |
| CATEGORIES ABOUT COLLET | |
| machine tooling | |
| woodworking | |
| tools | |
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Collets generally have a narrow clamping range which means a large number are required to hold a given range of materials, unlike a Chuck that will generally cover the full range that the machine is designed for. The collet's advantage over the chuck is that it offers much higher precision when reclamping a single object to work it in a series of steps. WOODWORK On a Wood Router (a hand-held or table-mounted power tool used in Woodworking ), the collet is what holds the bit in place. In the U.S. it is generally for 1/4 or 1/2 inch bits, while in Europe bits are most commonly 6 mm or 8 mm. The collet is hexagonal on the outside so it can be tightened or loosened with a standard Wrench , and has threads on the inside so it can be screwed on to the motor Arbor . METALWORK There are literally hundreds of designs of collet used in the metalworking industry. There are some common designs like the 5C or the R8 collet and then there are many proprietary designs that only fit one specific manufacturer's equipment. Collets can range in holding capacity from zero to several inches in diameter. The most common collet grips a round bar or tool but there are collets for square, hexagonal and other shapes. In addition to the outside holding collets that are so common, there are collets that are used for holding a part on its inside surface so that it can be machined on its outside surface. Furthermore, it is not uncommon to make a collet that can hold highly irregularly shaped parts, these are variously called soft collets or emergency collets. The two top left collets are the side and end view of one style of collet, the two right collets are from a smaller range. The lower image is of a dissassembled Pin Chuck that is used to hold small drills or work pieces. The left most part is the ''body'', the ''collet'' is shown protruding from the body and the ''nose cap'' is separate, on the right. In use, the part to be held is
When the nose cap is tightened properly, enough force is applied to the collet that the taper at the front and back of the collet are pushed into their matching tapers, causing the collet to constrict in diameter. This constriction exerts considerable force onto the shank of the workpiece (drill) that is being held in the collet. It is then securely held against any forces it may encounter during normal operation. |
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