Machine forgings and black bars between centres

GMT Eccentric compensating chuck is used for machining forgings and black bars between centres. GMT Eccentric compensating chucks are supplied with spring loaded centre. The function of this spring loaded centre is to ensure that the component rests against its face.

GMT Eccentric compensating chucks are also supplied with special cover at extra cost. This special cover fitted on the chuck in lieu of spring loaded centre to ensure that the chuck works as a self-centering type.

GMT Eccentric compensating chuck is essentially designed where the component is usually located between two centres.One on the chuck body and one on the tail stock of the machine. Since the line of centres is defined, concentricity is guaranteed, but the function of the jaws is that they are designed to adjust and accommodate the lack of concentricity between the centre line of the component and its outside diameter.

The chuck has floating wedge for compensation and is operated by power – hydraulic or pneumatic rotating cylinder or by an electro mechanical actuator. In this chuck, gripping is achieved through a radially floating wedge . This wedge floats to the required extent in the body of the chuck to compensate the irregularities in the roundness of the component. The chuck body and wedge are designed to withstand heavy cutting loads. The floating wedge is capable of withstanding high operating forces . The floating wedge with its mechanical advantage, converts the operating force into a high clamping force.


The body is of forged steel. The guideways are hardened and ground. The chuck body is suitably recessed to remove large amount of material. The floating wedge and base jaws are made from nickel chrome steel, casehardened and ground onall working surfaces.

The base jaws are guided in the deep, wide, hardened slots in the body, which provide the ample bearing area necessary to withstand the forces resulting from high gripping forces. Provision has been made for manual lubrication of the sliding surfaces periodically through grease nipples. Serrations are provided on the top face of the base jaws.