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ASME B5.60-2002 pdf download

1 INTRODUCTION This American National Standard establishes techni- cal requirements for workholding chucks used primarily in turning operations. It covers jaw type chucks whether manual or power-operated. 2 SCOPE This Part of the ASME B5.60 standard covers the General Description and Definitions of Terms related to jaw type workholding chucks. 3 TYPES OF JAW CHUCKS BY DESIGN self-centering chuck: a chuck in which all jaws move to or away from the workpiece and maintain one common center. compensating chuck: a chuck in which jaw(s) move to or away from the workpiece without altering the position of the workpiece. independent chuck: a chuck in which each individual workholding. jaw is moved to or from the workpiece without disturbing the position of any other jaw. An example of a power chuck assembly is presented in Fig. 1. 4 METHODS OF ACTUATION manual: a chuck that is actuated by hand with the aid of human energy (e.g., by means of a chuck wrench). Refer to Fig. 2. power: a chuck that is actuated by means of pneumatic, hydraulic, or electrical energy, etc. Refer to Fig. 3. 5 DEFINITIONS actuator: a component within a chuck’s body, used to operate the chuck’s mechanism, such as a wedge, lever, scroll, etc. base jaw: see master jaw.
centrifugal force: force generated by rotation that tends to move all parts away radially from the axis of rotation of the chuck. chuck adapter: interface between the machine and the chuck. It can be a separate component or integral to chuck body. . chuck body: that part of the chuck that contains the actuator and master jaws. clamping cylinder: device that actuates the chuck through a draw bar or draw tube with the aid of pneumatic or hydraulic energy. clamping force: algebraic sum of the individual radial forces applied by the top jaws on the workpiece. clamping torque: product of the clamping force, clamping radius, and the coefficient of friction between the top jaw(s) and the workpiece. countercentrifugal chuck: a chuck in which there is a system that permits compensation for the loss of clamping force due to centrifugal force. draw bar: a bar or tube that connects the clamping cylinder to the chuck’s actuator to transmit the input force to the chuck. dynamic clamping force: actual clamping force when the chuck is rotating. hysteresis: change in static clamping force after the chuck has been rotated at working rotational speed with a constant input force. indicating band: a diameter on the chuck body desig- nated for measuring runout of a chuck. input force: force acting on the chuck’s actuator, applied from an extermal energy source. input torque: torque acting on the chuck’s actuator, applied from an external energy source. master jaw: radial moving part within the chuck body to which the top jaw is mounted. maximum rotational speed: maximum rotational speed in RPM specified by the manufacturer for a chuck with standard jaws in compliance with the manu- facturer’s instructions. maximum static clamping force: maximum clamping force obtained when the maximum permissible input force (or maximum input torque) is applied to a particu- lar chuck. moment of inertia: moment of inertia with respect to a given axis is the limit of the sum of the products of the mass of each of the elemental particles in which the body may be conceived to be divided and the square of their distance from the given axis. rotational balance: equilibrium of all masses around the axis of rotation [any difference(s) between the axis of rotation. and the center of gravity will cause imbalance]. static clamping force: clamping force of the chuck when the chuck is not rotating. top jaw: component that clamps the workpiece and is mounted on a master jaw. workholding chuck: a clamping device with moveable jaw(s) to hold a workpiece, designated hereinafter as “chuck.” working rotational speed: rotational speed in RPM under machining conditions.

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