Definition

Noun A collet chuck is a specialized, cone-shaped clamping device used in machining, particularly in a lathe. Its primary function is to securely hold cylindrical workpieces (such as rods or bars) or tools with great precision and concentricity. It typically uses a tapered, slotted sleeve (the collet) that contracts uniformly around the object when tightened, providing a strong, accurate grip.

Examples

• The machinist inserted the steel rod into the collet chuck before beginning the turning operation.
• For precision work on small diameters, a collet chuck is often preferred over a standard jaw chuck.
• The collet chuck ensures the workpiece is held firmly and runs true, minimizing vibration.

Advanced Usage

• Collet chuck systems are integral to high-precision CNC (Computer Numerical Control) machining and Swiss-style lathes, where extreme accuracy is required.
• The term is often used in contrast to other chuck types, such as three-jaw chucks or four-jaw chucks, highlighting its specific use for cylindrical shapes and its method of uniform radial contraction.

Variants and Related Words

• Collet (noun): The actual slotted, tapered sleeve that fits inside the collet chuck and makes direct contact with the workpiece. The collet chuck is the assembly that houses and actuates the collet.
• ER Collet Chuck: A very common and standardized type of collet chuck system, known for its wide clamping range and high gripping force.
• Drawbar Collet Chuck: A type where a central rod (drawbar) is pulled to tighten the collet, commonly used on milling machines.

Synonyms

• Clamping chuck (a more general term)
• Workholding chuck (a more general term)

Related Phrases

• To mount in a collet chuck: The action of installing a workpiece or tool into the device.
  • Example: The drill bit must be properly mounted in the collet chuck to avoid runout.
• Collet chuck capacity: Refers to the range of diameters a specific collet chuck can hold.
  • Example: Check the collet chuck capacity before attempting to clamp the large bar stock.

Noun

1. a cone-shaped chuck used for holding cylindrical pieces in a lathe