![]() ![]() Usually preceded and followed by a dash (any letter except I, O, or Q).ĭatum Line - A datum line is that which has length but no breadth or depth, such as, an intersection line of two planes, centerline or axis of Of the actual datum feature cylindrical surface, or the axis formed at the intersection of two datum planes.ĭatum Feature - A datum feature is the actual component feature used to establish a datum.ĭatum Identification frame (Symbol) - The datum identification frame (symbol) contains the datum reference letter in a rectangular box, Intersecting coordinate planes measured to that one of three straight-line axes that is the intersection of the other two planes.Ĭoplanar - Coplanar describes a condition of two or more surfaces having all elements in the same plane.Ĭylindricity - Cylindricity describes a condition of a surface of revolution in which all points of a surface are equidistant from a commonĭatum - Datums are points, lines, planes, cylinders, axes, etc., a, from which the location, or geometric relationship of other part featuresĭatum Axis - the datum axis is the theoretically exact centerline of the datum cylinder as established by the extremities or contacting points (2) Any of three coordinates that locate that locate a point in space and measure its distance from any of three Straight-line axes along a line parallel to the other axis. Symbol:Ĭoaxial - Coaxial describes a condition where two or more features have the same axis or centerline.Ĭoordinate Dimension - (1) Either of two coordinates that locate a point on a plane and measured its distance from either of two intersecting Understanding of the measurement process should be investigated before defining feature relationships using concentricity. Measurement requirements for concentricity invovles the complex task of maping the referenced feature by way of opposed pont measurments. Symbol:īilateral Tolerance - A bilateral tolerance is a tolerance in which variation is permitted in both directions from a specified dimensionĬenter Plane - Center plane is the middle or median plane of feature.Ĭlearance Fit - A clearance fit is one having limits of size defined such that a clearance always results when mating parts are assembled.Ĭoncentricity - Concentricity describes a condition in which two or more features (cylinders, cones, spheres, etc.) In any combination have aĬommon axis. Basic dimensions are enclosed by a rectangle. Block tolerance does not apply and the applicable tolerance will be given A basic dimension is alway associated with a feature control frame or datum target. ![]() ![]() GD&T Geometric Dimensioning and Tolerancing terms and definitions.Īctual Size - Actual size is the measured size of the produced feature.Īngularity - Angularity is the condition of a surface, axis, or centerplane, which is at a specified angle (other than 0, 90, 180 or 270 deg.)īasic Dimension - A basic dimension is a theoretically exact value used to describe the exact size, profile, orientation or location of aįeature. GD&T Symbols, ISO G&T Symbols 1101 DefinitionsĮngineering Design Manufactuirng Definitions and Terms Geometric Dimensioning & Tolerancing GD&T Symbols & Definitions
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