GRAFAR TECHNOLOGY

Special Chucks

At Grafar Technology, we specialize in manufacturing high-performance Special chucks for CNC lathe machines. With our in-house design team, we develop innovative and customized solutions to meet the most demanding machining requirements. With a track record of delivering precision-engineered chucks to a wide range of industries, we have successfully provided solutions for even the most Complex workpieces. Our expertise ensures that every chuck we manufacture enhances productivity, accuracy, and efficiency in CNC operations.

Custom-Built Special Chucks -Designed to fit unique machining needs
Expert In-House Design Team - Tailor-made solutions for complex workpieces Proven Industry Experience - Trusted by leading companies across various sector High-Quality Manufacturing - Precision, durability, and reliability in every product. Quick Delivery Time – "With our fast delivery, you can start your projects immediately

IS YOUR TRUSTED PARTNER IN WORK-HOLDING SOLUTIONS

Face Clamping Chuck

A Face Clamping Chuck is a specialized fixture used in CNC (Computer Numerical Control) machines to securely hold and position a workpiece during machining operations. This type of chuck is particularly designed to clamp workpieces by applying pressure to the flat surface or face of the part, rather than around the edges, like traditional three-jaw chucks or collet chucks.

Face Clamping Mechanism: The chuck utilizes a clamping force applied directly to the workpiece's face or side. It typically uses adjustable jaws or a hydraulic or pneumatic clamping system to apply even pressure across the workpiece's surface

An Eccentric Compensation Power Chuck is a type of chuck used in CNC machines designed to improve clamping accuracy, especially in situations where workpieces have minor variations in their shape or positioning. It incorporates a unique mechanism that compensates for slight eccentricities or misalignments in the workpiece, ensuring it remains securely held during machining.

The key feature of an Eccentric Compensation Power Chuck is its ability to automatically adjust the clamping force based on the eccentricity (misalignment) of the workpiece. It achieves this through a mechanism that adjusts the position of the jaws in response to any unevenness or angular errors in the workpiece. This mechanism can be either mechanical or hydraulic, depending on the design of the chuck.

Self-Centering Ability: The chuck is designed to compensate for slight errors in the alignment of the workpiece, automatically centering the part as it is clamped. The jaws of the chuck are connected to an eccentric (off-center) cam or a special mechanism that allows them to adjust their position relative to the workpiece to ensure a precise and even grip.

Eccentric Compensation Chuck

A Grip Down Chuck is a type of chuck used in CNC machines, specifically designed to clamp workpieces securely by applying a downward gripping force. This type of chuck is often utilized for applications that require high clamping force, especially in turning operations, where workpieces need to be held tightly in place during machining.

Downward Clamping Force - The Grip Down Chuck operates by applying a clamping force in a downward direction, as opposed to the radial clamping used in traditional chucks. This ensures that the workpiece is pressed down firmly onto the machine’s worktable or fixture, enhancing stability during machining operations reating a secure hold and preventing movement or vibration during machining.

Grip Down Chuck

A Power Operated Hand Indexing Chuck is a specialized clamping device used in CNC machines or other precision machines that allows for quick, precise positioning (indexing) of workpieces. This chuck combines the benefits of a power-operated clamping system with the ability for an operator to manually index or rotate the workpiece into predefined positions. It’s commonly used for tasks where multiple angular orientations are needed for machining, such as in drilling, milling, or turning operations.

Power-Operated Clamping: The Power Operated Hand Indexing Chuck uses a power driven system (typically hydraulic or pneumatic) to apply a clamping force to the workpiece. This power operation ensures the workpiece is held securely, and the force can be controlled to prevent over-tightening or under-tightening, which is critical for part accuracy.

Manual Indexing (Hand Indexing): Despite the chuck's power-operated clamping system, the operator can manually rotate or index the workpiece to a specific angle or position using a handwheel or lever. This allows for quick, precise adjustment of the workpiece’s orientation without requiring the chuck to disengage completely. The hand indexing feature makes it easier for the operator to set up multiple machining operations on different faces or sides of the workpiece.

Indexing Mechanism: The chuck typically features a detent mechanism or positioning pins that enable the workpiece to be rotated to specific, pre-set angles. These positions are usually measured in degrees (e.g., 90°, 180°, or 360°) and can be locked into place by engaging a pin or mechanism. The detent or indexing mechanism ensures that the workpiece is held securely at the selected angle, reducing the chance of accidental movement during machining.

Quick Setup and Adjustments: The Power Operated Hand Indexing Chuck is designed for rapid setup changes. Once the workpiece is clamped, the operator can quickly rotate it to the desired position with minimal effort, making it efficient for multi-face or multi-sided machining operations. This reduces setup times significantly compared to manually repositioning or using traditional indexing fixtures.

Power Operated Hand Indexing Chuck

A Twist Finger Chuck is a specialized clamping device used in CNC machines and other precision machining applications. It is designed to hold cylindrical or irregularly shaped workpieces by gripping them from multiple points using a set of adjustable fingers. The unique feature of a Twist Finger Chuck is its ability to adjust and apply clamping force through a twisting motion, which ensures a secure and uniform grip on the workpiece.

Twisting Mechanism: The chuck features a twisting or rotating action, which moves multiple clamping fingers inward or outward to grip the workpiece. The operator or machine system rotates a central control (typically a handwheel or motorized mechanism), which causes the fingers to move in a twisting pattern, adjusting the grip based on the workpiece's shape and size.

Multiple Adjustable Fingers: The chuck uses multiple "fingers" (clamping elements) that can be individually adjusted to accommodate different workpiece diameters or geometries. These fingers are often mounted on a rotating hub or base, which allows for precise radial movement, ensuring a uniform clamping force around the workpiece.

Twist Finger Chuck

A Diaphragm Chuck is a type of chuck used in CNC machines and other precision machining applications to securely hold a workpiece, typically in turning operations. Unlike traditional chucks that use multiple jaws to grip the workpiece, a diaphragm chuck utilizes a flexible diaphragm (often made of metal) that uniformly applies clamping pressure to the workpiece from the inside out. This provides even and consistent force, which is crucial for maintaining precision during machining.

Flexible Diaphragm: The core feature of the diaphragm chuck is its flexible diaphragm, which is usually made of high-strength steel or another durable material. This diaphragm acts as a spring, allowing it to expand and contract, applying uniform pressure to the workpiece. When the diaphragm is engaged, it pushes against the inner surface of the workpiece (for internal gripping) or the outer surface (for external gripping).

Clamping Action: The chuck operates by using a hydraulic or mechanical system to deform the diaphragm. When activated, the diaphragm either expands or contracts, pressing against the workpiece to hold it in place. The force is distributed evenly around the circumference, which helps minimize distortion and ensures that the workpiece remains stable during machining.

Uniform Pressure: The diaphragm chuck is known for its ability to apply uniform clamping pressure, making it ideal for holding delicate, thin-walled, or irregularly shaped workpieces. The even force distribution reduces the risk of part distortion, which is often a problem with traditional chucks that apply force at discrete points.

Diaphragm Chuck

Grafar Technology’s Universal Ball Lock Chuck is designed to ensure component clamping. This special type of chuck holds widespread advantages over lever and wedge-type chucks. Universally used for gripping casts and forging, this chuck ensures less stress, wear and bearing pressure than conventional wedge and lever-type chucks. The eccentric compensating type of Universal Ball Lock Chuck is for use where the component needs location between two centers. One end of the component can be mounted on the chuck body and one on the tailstock of the machine. Since the line of the centers is defined, concentricity is guaranteed. The design of the ball lock chuck allows adequate freedom for the jaws to adjust and accommodate the irregularities of the job before the application of full clamping force

Quick and Easy Setup: One of the main advantages of the Universal Ball Lock Chuck is its quick-change capability. When the chuck is engaged, the ball locks into place, allowing for fast and easy part setup or changeover without needing complex adjustments or tools. This saves time during multi-part or multi-operation machining.

UBL Chuck With Top Tooling

UBL Chuck Without Top Tooling

Universal Ball Lock Chuck

An Expanding Mandrel Chuck is a specialized clamping device used in CNC machines to hold workpieces, particularly those with a hollow center or internal bore. This chuck uses an expanding mandrel (a tapered, cylindrical device) to grip the internal surface of the workpiece by expanding, ensuring a firm and precise hold. It is commonly used for holding cylindrical parts or parts with a hole in the center, such as tubes, rings, and bushings.

Expanding Mandrel: The core of the chuck is the mandrel, which has a tapered shape. When the chuck is activated, the mandrel expands, pressing against the internal diameter of the workpiece. This expansion creates a secure grip on the internal surface, holding the part firmly in place during machining.

Clamping Force: The expansion mechanism is typically powered hydraulically, pneumatically, or mechanically. The mandrel is designed to apply even, distributed clamping force along the internal surface of the workpiece, ensuring stability and minimizing the risk of part deformation.

Accurate and Stable Holding: The expanding mandrel chuck provides precise and concentric holding, especially for cylindrical workpieces. The expanding force applies evenly around the internal bore, ensuring that the workpiece is centered and stable during machining.

Expanding Mandrel Chuck

A Collet Chuck is a type of clamping device used in CNC machines to securely hold a workpiece, typically cylindrical in shape, during machining operations. Unlike traditional chucks that use jaws to grip the workpiece, a collet chuck uses a collet (a type of sleeve) that fits around the workpiece and tightens to provide a secure, even clamping force.. The collet and stopper are interchangeable and can easily be changed according to the size and diameter of the work – for convenient use when the work requires frequent changes.

Collet: The collet is a tapered, cylindrical sleeve that fits inside the chuck. It has a split design, allowing it to expand or contract when the chuck is engaged. The workpiece is inserted into the collet, and when the chuck is tightened, the collet expands or contracts to securely grip the part along its circumference. The collet can accommodate a wide range of part sizes, making it versatile for various operations.

Collet Chuck

Our Range Of Products

"We specialize in manufacturing high-precision Top Tooling along with the Chucks, engineered to meet the critical requirements of complex components. Our expertise ensures that each solution is designed and manufactured based on component criticality and intricate design specifications, delivering optimal performance and reliability."

Contact Us for Special Chucks

Reach out to us for Enquiries about our Chucks. We are here to assist you with any questions or requests.

Contact Number :

9176212234 , 7010782907

Enquiry :

sales@grafartechnology.com marketing@grafartechnology.com