By Gene Cogorno
A necessary self-teaching consultant This sourcebook offers a radical clarification of ASME 14.5, the geometric dimensioning and tolerancing ordinary that is used essentially to speak engineering configurations from the dressmaker to the producer. seriously illustrated with engineering configurations, this booklet comprises sensible examples to evaluate person wisdom in addition to routines according to the commonly asked Questions accrued over the author's 26 years as an educator.
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Extra info for Geometric Dimensioning and Tolerancing for Mechanical Design: A Self-Teaching Guide to ANSI Y 14.5M1982 and ASME Y 14.5M1994 Standards (McGraw-Hill Mechanical Engineering)
They are the alphabet, the deﬁnitions, and the syntax of this language. The GD&T practitioner must be very familiar with these symbols and know how to use them. It is best to commit them to memory. Can you imagine trying to read a book or write a composition without knowing the alphabet, without a good vocabulary, and without a working knowledge of how a sentence is constructed? A little memorization up front will save time and reduce frustration in the future. Chapter Objectives After completing this chapter, you will be able to List the 14 geometric characteristic symbols Identify the datum feature symbol Explain the elements of the feature control frame List the three material condition modiﬁers Identify the other symbols used with GD&T Deﬁne 12 critical terms Explain the four general rules.
3-2. A datum feature symbol is typically attached to a feature control frame directed to the datum with a leader, such as datums K, M, and N. If the datum feature symbol is placed in line with a dimension line or on a feature control frame associated with a size feature, the size feature is the datum. For example, in Fig. 00-inch slot. 780 N S R Leader Figure 3-2 features. Dimension Line Four views illustrating methods of attaching datum feature symbols to 20 Chapter Three The feature control frame The feature control frame in the GD&T language is like a sentence in the English language—it is a complete tolerancing thought.
May be used if a large number of datums are required. The datum feature symbol is used to identify physical features of a part. The datum feature symbol must not be attached to centerlines, center planes, or axes. It may be directed to the outline or extension line of a feature such as datums A through G shown in the top two drawings of Fig. 3-2. The datum feature symbol may also be associated with a leader or dimension line as shown in the lower two ﬁgures. If only a leader is used, the datum feature symbol is attached to the tail, such as datum J in Fig.