Pronunciation: [kˈɒlɪt] (IPA) 
The word "collet" is spelled with two L's and one T, despite its pronunciation containing only one clear L sound. This is because the word is derived from Old French and Middle English, where it was spelled "colet" or "collete." The double L spelling is a common feature of these languages, and the T is added in modern spelling to reflect the word's origin. In IPA phonetic transcription, "collet" is pronounced /kɒˈlɛt/.
A collet is a specialized type of chuck that securely holds and clamps various types of tools or workpieces in place during machining or other mechanical operations. It is typically cylindrical in shape, with a hole at the center that matches the size and shape of the tool or workpiece being held.
Constructed from high-quality materials such as steel or brass, a collet is designed to provide a tight grip while minimizing slippage or movement. It consists of multiple slits or splits, evenly spaced around the circumference of the hole, creating a compressible and expandable mechanism when tightened. This allows for a wide range of tool or workpiece sizes to be securely held.
In practice, a collet is often used with machines such as lathes, milling machines, or drill presses, where precise and accurate positioning of the tool is essential. By inserting the tool or workpiece into the collet and then tightening it, the collet exerts pressure evenly around the entire circumference, ensuring a firm grip.
Collets come in various sizes and designs, including those with internal threads to match the spindle of the machine and others that are threaded externally. Additionally, there are specialized collets designed for specific applications, such as gripping round or hexagonal workpieces.
Overall, the primary function of a collet is to securely hold tools or workpieces in place during machining operations, providing stability and precision.
The part of a ring in which a precious stone is set; the neck or part of a plant that lies between the root and stem.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "collet" has an etymology that can be traced back to Middle English and Old French.
In Middle English, the word "collet" referred to a “little collar” or a circular band, often used for fastening or securing something. This term was borrowed from Old French, where it had the same meaning.
Old French derived "collet" from the Latin word "collum", which means “neck” or “collar.”
Therefore, the word "collet" originally described a small collar-like object, and over time, its usage expanded to include other meanings, such as the circular recess used to secure a gemstone in jewelry.
