• Guindy Machine Tools Limited

Chucks, Power Operated

GMT make power chucks, available for over two decades, have undergone periodic design changes for better performance. The basis of the design, viz, wedge type construction, is however, maintained. The chuck body is of forged steel. The guideways arehardened and ground. The wedge, made of nickel chrome steel is case hardened and ground on all the working surfaces. The base jaws, also made of nickel-chrome steel, are case hardened and ground to match both the wedge and body guideways. The base jaws are guided in deep, wide, hardened slots in the body, which provide the ample bearing area necessary to withstand the forces resulting from high gripping pressures. 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. The reversible, hardened and ground hard jaws have serrations on the bottom to match the base jaws. The various radii on the hard jaws in conjunction with the serrations, are designed to grip a wide range of diameters. The hardened and ground guideways of the body, nickel chrome case hardened and ground base jaws and the wedge ensure high load carrying capacity over a long period. These power-operated chucks can be actuated by a pneumatic rotating cylinder, hydraulic rotating cylinder or electro-mechanical actuator. The actuating unit imparts a linear motion to the wedge through a drawbar. The linear motion of the wedge is transformed to radial movement of the base jaws. This transformation provides a mechanical advantage of 1:4. This ensures a minimum of 1:2 mechanical advantage after providing for internal losses, self-locking effect and losses in gripping power at high speeds. The basic design of the GMT chuck permits actuation through pneumatic or hydraulic cylinder, at varying pressures or through electro-mechanical actuators.