ASME B5.8-2001 pdf download
ASME B5.8-2001 pdf download.CHUCKS AND CHUCK JAWS.
1 SCOPE AND PURPOSE This Standard applies to chucks for use on engine lathes, tool room lathes, turret lathes, and automatic lathes and fit American Standard Spindle Noses of ANSI-B5.9-1967. They may be used on other applica- tions for which they are suitable (see pages 4 and 5 of ANSI-B5.9-1967). It is within the scope of this Standard to establish: (u) duty classes (b) standard chuck diameters (c) top jaw interchangeability (d) mounting interchangeability (USA-Standard (e) draw-bar interchangeability for power chucks ( ’ identification code for body, master jaws, top jaws dimensions, where interchangeability of chucks may be involved Spindle Noses) (g) nomenclature O 2 CHUCK SIZES AND DIAMETERS The following table gives the approximate chuck 3 SPECIFICATIONS OF CLASS I CHUCKS Class I chucks are medium-duty, wrench-operated chucks with master jaws of the tongue-and-groove type for use on engine lathes and for other applications where the service is not severe. These chucks are provided with master jaws of the dimensions given in Table 1. The tops of the master jaws project above the face of the chucks in all sizes. The mating dimensions of top jaws for these chucks are given in Table 2. Standard three-step reversible top jaws for these chucks may or may not be made so that with the long gripping surface of the top jaws inwardly mounted, the top jaws and the master jaws will both grip a piece of bar stock inserted through the chuck. When the three-step jaws are reversed, the inner ends of top jaws may or may not have gripping surfaces. If they do, the ends of the master jaws project inward beyond the top jaws to provide a definite shoulder on the master jaw for locating any piece that may be gripped by the inner step of the top jaws. These chucks may have two or more jaws and may be of the independent, self-centering or combination type. 4 SPECIFICATIONS OF CLASS II CHUCKS body diameters -of each- size of standard chuck. All standard chucks with two jaws, three jaws, or four jaws, whether independent, self-centering, or combina- tion type, both wrench-operated and draw-bar operated, shall be made so that the outside diameter of the chuck body is one of these sizes. The name of each chuck shall be as given in the following table. For example, a chuck, the body of which is 6!4 in. in diameter, shall be known as a 6 in. chuck; one with a body 12 in. in diameter shall be known as a 12 in. chuck.
10.2 Directions for Balancing of Chucks for Type L Spindles When chucks for Type L spindles are to be balanced, the driving keyway shall have been previously finish machined in the taper. Such chucks shall then be balanced on a taper arbor provided with a full key and two screws holding the key in place, the taper, keyseat, key and two screws to be according to Table 28 of ANSI B5.9-1967. Such taper arbor shall have been previously balanced with a partial key that fills the keyseat and has an outside contour that coincides with the taper. To run in balance with such chucks, the Type L spindle should be balanced with a partiai key that fills the keyseat and has an outside contour that coincides with the taper. 11 DEFINITIONS chuck: as covered by this Standard, a workpiece hold- ing device to be mounted on a machine spindle as further described in combination chuck, draw-bar oper- ated chuck, independent chuck, self-centering chuck, and wrench-operated chuck. chuck body: that part of the chuck that encloses the operating mechanism for opening and closing the master jaws. It may be made of two pieces, if required, by the chuck design. combination chuck: a chuck in which are combined features of both the independent and self-centering chucks. The work holding jaws may collectively be moved as in self-centering chuck and/or individually adjusted as in an independent chuck. This chuck may have either three or four jaws and is intended for use in holding work pieces of any form or outline, eccentrically or concentrically. draw-bar operated chuck: a chuck in which the jaws are opened or closed by means connected to an operating bar or tube located on the central axis of the chuck and extending through the spindle of the machine tool on which the chuck is mounted. The operating bar or tube is usually actuated by an air cylinder, a hydraulic cylinder, or other power means located at the rear end of the spindle.
