ASME B89.1.5:1998 pdf download MEASUREMENT OF PLAIN EXTERNAL DIAMETERS FOR USEASMASTER DISCSOR CYLINDRICAL PLUG GAGES
1 SCOPE
This Standard is intended to establish uniform practices for the measurement of master discs or cylindricaplug gages to a given tolerance using vertical or horizontal comparators and laser instruments. The Standardincludes requirements for geometric qualities of masterdiscs or cylindrical plugs, the important characteristicsof the comparison equipment, environmental conditionsand the means to assure that measurements are madewith an acceptable level of accuracy. This Standarddoes not address thread or gear measuring wires.
2 DEFINITIONS
circularity (roundness): a condition of a surface ofrevolution where:
(a) for a cylinder or cone, all points of the surfaceintersected by any plane perpendicular to a commonaxis are equidistant from that axis;
(b) for a sphere, all points of the surface intersectedby any plane passing through a common center areequidistant from that center.
cosine error: the measurement error in the measurement direction caused by angular misalignment betweena measuring system and the gage or part being measured.
cylindriciry: a condition of a surface of revolution inwhich all points of the surface are equidistant from acommon axis.
diamneter: the length of a straight line through thecenter of a circular cross section of an object. In thecase of a cylinder, the line is considered to be perpendic-ular to the axis.
dimensional stabiliry: ability of an object (e.g. measuring instrument or workpiece) to maintain its metrological characteristics with time.
NOTES:
(l) Where stability with respect to a quantity other than time isconsidered, this should be stated explicitly.
(2) Stability mmay be quantified in several ways, for example:(a) in termns of the time in which a metrological characteristicchanges by a stated amount; or(b) in terms of the change in a characteristic over a stated time
discrimination (threshold): largest change in a stimulus that produces no detectable change in the responseof a measuring instrument, the change in the stimulustaking place slowly and monotonically.
elastic deformation: the nonpermanent (reversible)change in the size or geometry of a part due to anapplied force.
gage block: a length standard with rectangular, round.or square cross section, having flat, parallel opposinggaging faces.
NOTE: The surface finish of the gaging faces should be such as toallow gages to be wrung together.
index of refraction: for a given wavelength, the ratioof the velocity of light in a vacuum to the velocityof light in a refractive material.
NOTE: As used in this Standard, the material is air.
line contact: the zone of contact between a flat surfaceand a cylinder.
lobing: systematic variations in the radius around apart (measured in the cross section perpendicular tothe axis).
master cylinder: a known-size cylinder used for setupfor comparison to the gage being measured.
master disc: a cylinder of known size, with insulatinggrips, used to set or verify another gage. The toleranceis typically bilateral.
measurand: particular quantity subjected to measurement.
EXAMPLE: Diameter of a cylindrical gage at 20°C.
measurement force: the amount of force exerted uponthe object being measured by a measuring instrument
ASME B89.1.5:1998 pdf download
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