In the following drawings, for example, based on where the indication lines are, the center lines and generatrices for straightness in the same shape may or may not indicate a feature of size. The target parts for geometric tolerance depend on the position where the indication line is drawn. Training CoursesPublic coursesGeometrical Tolerancing to BS 8888 and ISO standards Level 1Geometric Dimensioning and Tolerancing to ASME Y14.5 Level 1Geometrical Tolerancing to BS 8888 and ISO standards Level 2Geometric Dimensioning and Tolerancing to ASME Y14.5 Level 2Introduction to BS 8888Introduction to tolerance stack. Since the feature is defined by size dimensions, the overall size changes along with the dimensions. Examples of feature of size include cylindrical and spherical forms as well as two opposing planes. “Feature of size” is the geometric shape defined by size dimensions such as length and angle. It specifies that the surface of a single feature of size (a cylindrical surface or a feature established by two parallel opposite plane surfaces) should not violate the imaginary envelope of perfect (geometrically ideal) form at the maximum material size. The envelope requirement means that the maximum (or minimum) allowable size for a part must be within the same range (or out of the same range) as the maximum size (or minimum size).
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