ASME B89.1.5:1998 pdf free download.MEASUREMENT OF PLAIN EXTERNAL DIAMETERS FOR USE AS MASTER DISCS OR CYLINDRICAL PLUG GAGES.
4.1 General
The capability of measuring equipment and tech. niqucs to achieve a high order of precision in the calibration of master discs or cylindrical plug gages is limited by relevant features and conditions of the gage to he measured. These are discussed in paras. 4.2 through 4.8.
4.2 Design
The design and proportion specifications for gage blanks are given in ASME/ANSI B47.l.
4.3 Material
The material, including coatings or wear inserts, of master discs or cylindrical plug gage blanks shall be free from inclusions or other imperfections that would aftect surface texture. The material shall respond to applicable hardening and stabilizing processes to permit hnishing to the essential surface texture and to assure dimensional stability. Finished surfaces shall have a minimum hardness equivalent 10 60 on the Rockwell C Scale. Master gages shall not be subjected to any quick aging or shock treatment as a check of stability.
4.4 Surface Texture
The surface texture shall be consistent with the class tolerance of the gage. Table I lists maximum roughness values expressed in anthmelic average (Re) roughness values. ASME B46.l shall be consulted for reference information.
4.5 Geometric Requirements
4.5.1 General. The diameter will be measured per para. 6 of this Standard. Typical acceptance criteria for geometric requirements are diameter measurements spaced approximately 90 deg apart in each of three planes; the midsection, and each end, located 1.6 mm (1/16 in.) from inside the ends of corner radii or chamfers.
Two-point diameter measurements will not detect the effect that odd-numbered or irregular lobing has on size. Diameter measurements taken at multiple locations may not fully detect ovality. even-numbered lobing. or straightness deviation.
If the gage is measured with nonstandard techniques. such as multiple.point methods or unusually wide plane anvils, the values in Table 3 may not be appropriate.
ASME B89.1.5:1998 pdf free download
