Collet Chuck

A collet chuck is a specialized clamping component within a lens mounting fixture that securely grips optical lenses or lens blanks during precision machining, grinding, or polishing operations. It provides concentric holding with minimal runout to ensure accurate optical alignment and surface finishing. The chuck consists of a tapered sleeve (collet) that contracts uniformly when axial force is applied, typically via a drawbar or threaded mechanism. This contraction creates a precise, concentric grip on the workpiece, allowing for high-precision rotational machining while minimizing distortion. The collet chuck is available in standard sizes and types, with clamping ranges from 1 to 32 mm (ISO 15488), collet types ER11 to ER40 (DIN 6499), and runout accuracy between 0.005 and 0.015 mm at the nose (ISO 15488). Maximum speed ranges from 6000 to 15000 rpm, operating temperature from -10 to 70 °C, and weight from 0.5 to 8.5 kg. Materials on file include tool steel, stainless steel, and carbide, with a material grade of 20CrMnTi (GB/T 3077) and hardness of 58–62 HRC (ISO 6508). Thread sizes range from M12 to M60 (ISO 68-1), and balancing grades from G2.5 to G6.3 (ISO 21940-11). These values are directory reference ranges and must be confirmed for the actual model and application with the legal manufacturer or supplier. The collet chuck is a component used in machinery and equipment manufacturing, specifically for optical lens processing. It is not a complete machine but a part that requires integration into a larger system. The product is listed in a neutral directory and is not manufactured or sold by the directory operator. For procurement, verify model-specific specifications, standards compliance, and suitability for your application with the supplier.

The collet chuck operates through a tapered sleeve (collet) that contracts uniformly when axial force is applied, typically via a drawbar or threaded mechanism. This contraction creates a precise, concentric grip on the workpiece, allowing for high-precision rotational machining while minimizing distortion. The taper angle and material properties of the collet determine the clamping force and accuracy. The chuck is designed to hold cylindrical workpieces or tools securely, with minimal runout to ensure accurate alignment. The operating principle relies on the elastic deformation of the collet within its elastic limit, providing repeatable clamping. The axial force can be applied manually or automatically, depending on the machine configuration. The collet chuck is suitable for applications requiring high concentricity and low runout, such as optical lens grinding and polishing. The principle is based on the mechanical advantage of the taper, which converts axial force into radial clamping force. The collet's design ensures even distribution of force around the workpiece, preventing distortion and ensuring consistent results.