Collet

Collet

A collet used in machining

A collet is a type of holding device used in machining operations. It is designed to securely hold a workpiece or tool in place during various machining processes, such as drilling, milling, or turning. The collet consists of a cylindrical sleeve with a tapered inner surface that matches the shape of the workpiece or tool being held. This allows for a tight and precise grip, ensuring stability and accuracy during machining.

Types of Collets

There are several types of collets available, each designed for specific applications and workpiece/tool sizes. Some common types include:

1. Round Collets: These are the most basic type of collets and are used for holding round workpieces or tools. They typically have a circular cross-section and are available in various sizes to accommodate different diameters.

2. Hex Collets: Hex collets, as the name suggests, have a hexagonal shape. They are commonly used for holding hexagonal workpieces or tools, providing a secure grip and preventing slippage.

3. Square Collets: Square collets are designed for holding square workpieces or tools. They have a square cross-section and are often used in applications where precise angular alignment is required.

4. Eccentric Collets: Eccentric collets are used for holding irregularly shaped workpieces or tools. They have a non-uniform inner surface that matches the shape of the workpiece/tool, allowing for a customized grip.

Collet Chucks

A collet chuck used in machining

To utilize the benefits of collets, a collet chuck is used. A collet chuck is a specialized device that holds the collet and allows for easy insertion and removal of the workpiece or tool. It typically consists of a cylindrical body with a mechanism for tightening or loosening the collet.

Collet chucks come in various designs, including manual, pneumatic, and hydraulic types. Manual collet chucks require manual tightening using a wrench, while pneumatic and hydraulic chucks use compressed air or hydraulic pressure, respectively, for quick and automated tightening.

Applications

Collets find extensive use in various machining operations across different industries. Some common applications include:

1. Metalworking: Collets are widely used in metalworking processes such as drilling, milling, and turning. They provide a secure grip on the workpiece or tool, ensuring precise and accurate machining.

2. Woodworking: In woodworking, collets are used to hold router bits, drill bits, and other cutting tools. They allow for efficient and controlled cutting, resulting in high-quality woodworking projects.

3. Jewelry Making: Collets are commonly used in jewelry making to hold gemstones, pearls, or other precious materials. They provide a secure and elegant setting for these valuable items.

See Also

• Machining
• Tool Holder
• Workholding Devices