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AutoCAD and Its Applications Basics 2011 - (AutoCAD及其应用基础2011 -).pdf

发布:2017-07-24约1.84万字共8页下载文档
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AutoCAD and Its Applications R E F E R E N C E B A S I C S M AT E R I A L S Student Web Site Drafting Symbols Symbols provide a “common language” for drafters all over the world. However, symbols are meaningful only if they are drawn according to relevant standards or conventions. This document describes and illustrates common dimensioning, GDT, architectural, piping, and electrical symbols. Recommended ASME Dimensioning Symbols The size of dimensioning symbols is consistent with text height. In the following illustration, H = text height. 60° 1.5H H Diameter Radius Spherical Spherical Controlled Places Radius Diameter Radius or By 1.5H 90 ° 2H H 0.8H H 2 H H H Symmetrical Shape Counterbore Spotface Countersink Square Shape H 0.3H 1.5H H 1.5H H 0.6H 60° 0.3H Arc Length
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