By American Society of Mechanical Engineers (ASME)
This typical establishes uniform practices for mentioning and reading dimensioning, tolerancing, and similar specifications to be used on engineering drawings and in comparable files. Practices detailed to architectural and civil engineering, land, welding symbology aren't incorporated.
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Additional info for ASME Y14 5M- Dimensioning and Tolerancing
See Fig. 3-2. Letters of the alphabet (except I, 0, and Q) are used as datum identifying letters. Each datum feature of a part requiring identification shall be assigneda different letter. ) shall be usedand enclosed in a rectangularframe. 3 Datum Target Symbol. The symbolic meansof indicatinga datum target is a circle divided horizontally into halves. See Fig. 3-6. The lower half contains a letter identifying the associateddatum, followed by the target number assignedsequentially starting with 1 for each datum.
The resultant condition of an internal feature is a variable value equal to its actual mating envelope size PLUS its applicable tolerance of location. The resultant condition of an external feature is a variable value equal to its actual mating envelope size MINUS its applicable tolerance of location. FIG. 2-7 MMC CONCEPT - VIRTUAL AND RESULTANT CONDITION 30 Copyright ASME International Provided by IHS under license with ASME Document provided by IHS Licensee=Visteon/5939448001, 02/04/2005 01:00:31 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295.
The symbolicmeansof indicatinga counterboreor a spotfaceis shownin Fig. The symbolprecedes, with no space,the dimensionof the counterbore or spotface. 13 Countersink Symbol. The symbolic meansof indicatinga countersinkis shownin Fig. 3-13. The symbolprecedes,with no space,the dimensionsof the countersink. 14 Depth Symbol. The symbolicmeansof indicatingthat a dimensionappliesto the depthof a featureis to precedethat dimensionwith the depth symbol,as shownin Fig. 3-14. The symbolandthe valuearenot separated by a space.