ASME B5-8:2001 pdf download CHUCKS AND CHUCK JAWS
1 SCOPE AND PURPOSE
This Standard applies to chucks for use on enginelathes, tool room lathes, turret lathes, and automaticlathes and fit American Standard Spindle Noses ofANSI-B5.9-1967.They may be used on other applications for which they are suitable (see pages 4 and 5of ANSI-B5.9-1967). It is within the scope of thisStandard to establish:
(a) duty classes
(b) standard chuck diameters
(c) top jaw interchangeability
(d) mounting interchangeability (USA-StandardSpindle Noses)
(e) draw-bar interchangeability for power chucks(f) identification code for body, master jaws, topjaws dimensions，where interchangeability of chucksmay be involved
(g)nomenclature
2 CHUCK SIZES AND DIAMETERS
The following table gives the approximate chuckbody diameters of each size of standard chuck. Allstandard chucks with two jaws, three jaws, or fourjaws,whether independent, self-centering,or combina-tion type,both wrench-operated and draw-bar operatedshall be made so that the outside diameter of the chuckbody is one of these sizes. The name of each chuckshall be as given in the following table. For example.a chuck, the body of which is 6′ in. in diameter.shall be known as a 6 in. chuck: one with a body 12in. in diameter shall be known as a 12 in. chuck.
3 SPECIFICATIONS OF CLASS I CHUCKS
Class I chucks are medium-duty， wrench-operatedchucks with master jaws of the tongue-and-groove typefor use on engine lathes and for other applicationswhere the service is not severe. These chucks areprovided with master jaws of the dimensions given inTable 1. The tops of the master jaws project above theface of the chucks in all sizes, The mating dimensions oftop jaws for these chucks are given in Table 2. Standardthree-step reversible top jaws for these chucks may ormay not be made so that with the long gripping surfaceof the top jaws inwardly mounted, the top jaws andthe master jaws will both grip a piece of bar stockinserted through the chuck. When the three-step jawsare reversed, the inner ends of top jaws may or maynot have gripping surfaces. If they do, the ends of themaster jaws project inward beyond the top jaws toprovide a definite shoulder on the master jaw forlocating any piece that may be gripped by the innerstep of the top jaws. These chucks may have two ormore jaws and may be of the independent, self-centeringor combination type.
SPECIFICATIONS OF CLASS II CHUCKS4
Class Il chucks are heavy-duty wrench-operated ordraw-bar operated chucks with master jaws of thetongue-and-groove type for use on turret lathes andfor other applications where the service is severe. Thesechucks are of stronger construction than Class I chucksThe wrench-operated chucks may be either hand operated or power operated. The draw-bar operated chucksare actuated by an air cylinder, a hydraulic cylinder.or other means. These chucks may have two or morejaws,and may be of the independent, self-centering.or combination type.
5 BODY DIMENSION AND MASTER JAWDIMENSIONS OF CLASS IIWRENCH-OPERATED CHUCKS
Table 3 gives body dimensions and master jawdimensions of Class Il wrench-operated chucks.Thetops of the master jaws of chucks project above theface of chuck bodies with the option of 12 in. and
ASME B5-8:2001 pdf download
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