ABMA 17:1980(R1994) pdf download

ABMA 17:1980(R1994) pdf download.NEEDLE ROLLERS METRIC DESIGN
2. DEFINITIONS AND SYMBOLS
2.1 Nominal Diameter of a Needle Roller, Dw. The diameter value which is used for the purpose of general identification of a needle roller diame- ter. See Figures 1 and 2. 2.2 Single Diameter of a Needle Roller, Dws: The distance between two tangents to the needle roller surface parallel to each other and in a plane perpendicular to the needle roller axis in a radial plane. 2.3 Single Plane Mean Diameter of a Needle Roller, Dwmp.: The arithmetical mean of the largest and the smallest actual single diameters of the needle roller in a single radial plane. 2.4 Nominal Length of a Needle Roller, Lw. The length value which is used for the purpose of general identification of a needle roller length. See Figures 1 and 2. 2.5 Actual Length of a Needle Roller, Lws: The distance between two radial planes which just contain the end extremities of the needle roller. 2.6 Nominal Corner Dimension (for flat end needle roller), r. See Figure 1. 2.7 Single Corner Dimension (for flat end needle roller), rg. See Table 2. 2.8 Nominal End Radius (for rounded end needle roller), R. See Figure 2. 2.9 Deviation From Circular Form (of the line of intersection of a needle roller surface and a radial plane). The greatest radial distance be- tween the circle circumscribed around the line and any point on the line. Information regarding measurement of the deviation from circular form is given in the Appendix. 2.10 Single Plane Diameter Variation of a Needle Roller, Vowp. The difference between the largest and the smailest actual single diameter of the needle roller in a single radial plane. 2.11 Needle Roller Gage. A diameter deviation range limited by a high and a low deviation of the mean needle roller Dwmp from the nominal diame- ter, Dw. in a radial plane through the middle of the roller length. A gage is designated by the high and low deviations expressed in microm- etres, for example -3/-6. 2.12 Gage Lot. A quantity of needle rollers of the same grade and nominal sizes all having a mean diameter Dwmpwithin the same gage. Needle rollers of any grade and nomi- nal size are supplied in gage lots. If nothing to the contrary has been agreed between the user and supplier the gage lots may be of any one or more of the gages included in Table 1. 2.13 Gage Lot Diameter Variation, VowL. The difference between the mean diameter Dwmp of the needle roller having the largest mean diame- ter and that of the needle roller having the small- est mean diameter in the lot. 2.14 Needle Roller Grade. A specific combina- tion of diameter and form tolerances. A needle roller grade is designated by a number.