By American Society of Mechanical Engineers
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Additional info for Dimensioning and tolerancing: engineering drawings and related documentation practices : an international standard
A space is used between the X and the --`,,`,,,``,`,``,,``,`,`,,,`,`,`-`-`,,`,,`,`,,`--- NOTE: Where the practices described in paras. 6 are used on the same drawing; care must be taken to be sure each usage is clear. 5-2009 Section 2 General Tolerancing and Related Principles to apply. The tolerance on these implied 90° angles is the same as for all other angular features shown on the field of the drawing governed by general angular tolerance notes or general tolerance block values. 4(i). GENERAL This Section establishes practices for expressing tolerances on linear and angular dimensions, applicability of material condition modifiers on geometric tolerance values, and interpretations governing limits and tolerances.
See Fig. 2-1. (b) Plus and Minus Tolerancing. The dimension is given first and is followed by a plus and minus expression of tolerance. See Fig. 2-2. (c) Geometric Tolerances Directly Applied to Features. See Sections 5 through 9. 1 Positional Tolerancing Method. Preferably, tolerances on dimensions that locate features of size are specified by the positional tolerancing method described in Section 7. In certain cases, such as locating irregular-shaped features, the profile tolerancing method described in Section 8 may be used.
2-23 Specifying a Controlled Radius radii) that are tangent to the adjacent surfaces. Where a controlled radius is specified, the part contour within the crescent-shaped tolerance zone must be a fair curve without reversals. It is recommended that the CR be further defined with an engineering control specification. Additionally, radii taken at all points on the part contour shall neither be smaller than the specified minimum limit nor larger than the maximum limit. See Fig. 2-23. Where it is necessary to apply further restrictions to the part radius, they shall be specified on the drawing or in a document referenced on the drawing.