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What (who) is Collet - definition

MECHANICAL DEVICE TO HOLD A SEPARATE PIECE, USUALLY BY RADIAL CLAMPING

collet

['k?l?t]

¦ noun

1. a segmented band put round a shaft and tightened so as to grip it.

2. a small collar in a clock to which the inner end of a balance spring is attached.

3. a flange or socket for setting a gem in jewellery.

Origin

ME: from OFr., dimin. of col 'neck', from L. collum.

Collet

·noun A small collar or neckband.

II. Collet ·noun The part of a ring containing the bezel in which the stone is set.

III. Collet ·- An inferior church servant. [Obs.] ·see Acolyte.

IV. Collet ·noun The flat table at the base of a brilliant. ·see ·Illust. of Brilliant.

V. Collet ·noun A small metal ring; a small collar fastened on an arbor; as, the collet on the balance arbor of a watch; a small socket on a stem, for holding a drill.

Collet

A collet is a subtype of chuck that forms a [around an object to be held and exerts a strong clamping force on the object when it is tightened, usually by means of a tapered] outer collar. It may be used to hold a [[workpiece or a tool.

https://en.wikipedia.org/wiki/Collet

Wikipedia

Collet

A collet is a segmented sleeve, band or collar. 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 has other mechanical applications.

An external collet is a sleeve with a cylindrical inner surface and a conical outer surface. The collet can be squeezed against a matching taper such that its inner surface contracts to a slightly smaller diameter, squeezing the tool or workpiece to hold it securely. Most often the collet is made of spring steel, with one or more kerf cuts along its length to allow it to expand and contract. This type of collet holds the external surface of the tool or workpiece being clamped. This is the most usual type of collet chuck. An external collet clamps against the internal surface or bore of a hollow cylinder. The collet's taper is internal and the collet expands when a corresponding taper is drawn or forced into the collet's internal taper.

As a clamping device, collets are capable of producing a high clamping force and accurate alignment. While the clamping surface of a collet is normally cylindrical, it can be made to accept any defined shape.

https://en.wikipedia.org/wiki/Collet

Examples of use of Collet

1. In 1858, Queen Victoria had 28 stones removed from a Garter badge and a ceremonial sword to make a collet diamond necklace and a pair of earrings (a "collet" setting is one in which a gem is set in a band of metal). These she left to the Crown when she died in 1'01.

2. Mumbai, June 4÷ Star cast÷ Elisa Cuthbert, Chad Murray, Paris Hilton; director÷ Jaume Collet Serra A bunch of pals are heading for a big ball game.

3. She is constantly flicking her hair and preening herself – and that is the other side of her." Dr Collet concluded: "Overall, I think she thinks she is telling the truth.

4. A band of taffetas, trimmed with braid, or a wide grecque of taffetas ribbon, is a style of trimming much used for the collet, when made of fancy material, alpaca, or mohair.

5. "Similarly, she makes constant reference to her folder of 4,400 newspaper cuttings – they are her proof, they are the justification for her that she is right." Dr Collet said her tone then changed: "In the second part of the interview, she makes a number of chopping gestures – it‘s a way of cutting off something and bring a close to what is upsetting her.