ASME B89.1.13:2001 pdf download

ASME B89.1.13:2001 pdf download.MICROMETERS
1 SCOPE
This Standard is intended to provide. the essential requirements for micrometers as a basis for mutual understanding between manufacturers and consumers. Outside, inside, and depth micrometers are described in the Standard.
2 DEFINITIONS
backlash: a relative movement between interacting mechanical parts, resulting from looseness [ASME B5.54M-1992 (R1998)l. In this Standard, backlash is further defined as the rotation of the spindle, in the opposite direction of the initial reading, before spindle moves in a linear direction. This condition is typically caused by looseness of fit between the lead screw and adjusting nut. bias: systematic enor of the indication of a measuring instrument (VIM). eccentricify: or axis of the body and its axis of rotation. end shake: the amount of spindle movement, when an axial force is applied in the direction of the spindle alternating towards the anvil and away from the anvil, without rotating the spindle. error (of indication) of a measuring instrument: indi- cation of a measuring instrument minus a true value of the corresponding quantity (VIM). the distance between the geometric center NOTE: This concept applies mainly where the instrument is compared to a reference standard. flatness: in one plane (ASME Y14.5M-1994). maximum permissible error (MPE): extreme values of an error permitted by specifications, etc., for a given measuring instrument (VIM). parallelism: the condition of a surface or center plane, equidistant at all points from a datum plane or axis, equidistant along its length from one or more datum planes or a datum axis d adjusting nut. bias: systematic enor of the indication of a measuring instrument (VIM). eccentricify: or axis of the body and its axis of rotation. end shake: the amount of spindle movement, when an axial force is applied in the direction of the spindle alternating towards the anvil and away from the anvil, without rotating the spindle. error (of indication) of a measuring instrument: indi- cation of a measuring instrument minus a true value of the corresponding quantity (VIM). the distance between the geometric center NOTE: This concept applies mainly where the instrument is compared to a reference standard. flatness: in one plane (ASME Y14.5M-1994). maximum permissible error (MPE): extreme values of an error permitted by specifications, etc., for a given measuring instrument (VIM). parallelism: the condition of a surface or center plane, equidistant at all points from a datum plane or axis, equidistant along its length from one or more datum planes or a datum axis (ASME Y14.5M-1994).
4 MICROMETERS, GENERAL
4.1 Materials The materials used for the component paks of a micrometer shall meet the minimum requirements for hardness, stability, and strength. 4.2 Resolution Micrometers using the inch system shall read to the least count of 0.001 in., 0.0001 in., or 0.00005 in. Micrometers using the metric system shall’read to 0.01 mm, 0.002 mm, or 0.001 mm. > L I ‘ 4.3 Finish The surface of graduated parts. &dl $-have a satin chrome or dull, nonglare finish. All other,exposed parts not utilized as measuring components shall be coated to prevent corrosion. Exposed surfaces of measuring components shall have a ground finish with surface roughness not to exceed 32 pin. (0.8 pm) Ra, except where otherwise specified within this document. 4.4 Identification Marking In addition to other markings, instruments shall be marked in a permanent and legible mannér with the manufacturer’s name or trademark so that the part number, range of the instrument, and the source of the manufacturer can be readily determined. 4.5 Adjustments Each instrument shall be adjustable to compensate for wear -on the measuring faces andor wear between the screw portion of the spindle and the nut. 4.6 Micrometers Screw Spindle , The screw spindle material shall be stabilized, preci- sion-ground, and have a hardness not less than 62 on the Rockwell C Scale. The fit between the spindle and its bearings, including the nut, shall be free-turning without perceptible backlash, end shake, or side shake.