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A collet / ˈ k ɒ l ɪ t / is a segmented sleeve, band or collar. [1] [2] One of the two radial surfaces of a collet is usually tapered (i.e a truncated cone) and the other is cylindrical. The term collet commonly refers to a type of chuck that uses collets to hold either a workpiece or a tool (such as a drill), but collets have other ...
An exception is the ER collet which typically has a working range of 1 mm (about 0.04 in). Collets usually are made to hold cylindrical work, but are available to hold square, hexagonal or octagonal workpieces. While most collets are hardened, "emergency" collets are available that can be machined to special sizes or shapes by the user.
Unlike hand tools, a tool in numerically (digitally) controlled machines is composed of several parts, such as the cutting tool (which may be one piece or comprise a body plus indexable inserts), a collet, and a toolholder with a machine taper. Putting the parts together accurately into an assembly is required to achieve error-free production.
The clamp is opened to insert the tool and then tightened down against the tool to secure it. This type of tap wrench is used with larger taps and where there is room to turn a larger wrench. [1] A T-handle is more compact. This type of wrench uses a collet to secure the tool. The collet design has two pieces: a threaded "nosecap" and four ...
The tool usually consists of a base housing a vertically mounted universal electric motor with a collet on the end of its shaft. The bit is height-adjustable to allow protrusion through an opening in a flat sole plate, usually via adjusting the motor-mounting height (the mechanism of adjustment is widely varied among manufacturers).
The chuck on impact drills is different from the conventional handheld power drill. The chuck acts more as a collet with a hexagonal shape in which the bits and drivers lock into. Impact drivers can also be used to bore holes like a standard pistol grip drill, but this requires a special bit that will lock into the hexagonal collet.
In machine tools, a spindle is a rotating axis of the machine, which often has a shaft at its heart. The shaft itself is called a spindle, but also, in shop-floor practice, the word often is used metonymically to refer to the entire rotary unit, including not only the shaft itself, but its bearings and anything attached to it (chuck, etc.).
The shank is the end of a drill bit grasped by the chuck of a drill.The cutting edges of the drill bit contact the workpiece, and are connected via the shaft with the shank, which fits into the chuck.