By American Society of Mechanical Engineers (ASME)
This usual establishes uniform practices for declaring and studying dimensioning, tolerancing, and similar standards to be used on engineering drawings and in comparable files. Practices particular to architectural and civil engineering, land, welding symbology are usually not integrated.
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Extra info for ASME Y14 5M- Dimensioning and Tolerancing
The total permissible variation in position or orientation is maximum when the feature is at LMC, unlessa maximum is specified. See Figs. 6-41 and 6-42. 8 APPLICABILITY OF RFS, MMC, AND LMC Applicability of RFS, MMC, and LMC is limited to featuressubjectto variationsin size. In the case of straightnesscovered in paras. 3, it is the derived median line and the derived median plane, rather than the axis and center plane that are controlled. In all cases,the following practicesapply for indicatingRFS, MMC, and LMC: (a) All Applicable Geometric Tolerances (Rule #2).
B) Plus and Minus Tolsrancing. The dimension is given first and is followed by a plus and minus expressionof tolerance. See Fig. 2-2. 1 Millimeter Tolerances. Where millimeter dimensionsare used on the drawings,the following apply. (a) Where unilateral tolerancingis usedand either the plus or minus value is nil, a single zero is shown without a plus or minus sign. EXAMPLE: 0 32-o-02 or (b) Where bilateral tolerancing is used, both the plus and minusvalueshave the samenumberof decimal places, using zeros where necessary.
4-29. 8 Reference Symbol. See Fig. 3-8. In written notes,parenthesesretain their grammaticalinterpretation unlessotherwise specified. 4 Basic Dimension Symbol. The symbolic means of indicating a basic dimension is shown in Fig. 3-7. 5 Material Condition Symbols. The symbolic means of indicating “at maximum material condition” and “at least material condition” are shownin Fig. 3-8. The use of these symbolsin local and general notes is prohibited. 9 Arc Length Symbol. The symbolic means of indicating that a linear dimensionis an arc length measuredon a curved outline is shown in Fig.
ASME Y14 5M- Dimensioning and Tolerancing by American Society of Mechanical Engineers (ASME)