tailieunhanh - Geometric Dimensioning and Tolerancing for Mechanical Design Part 2

Tham khảo tài liệu 'geometric dimensioning and tolerancing for mechanical design part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Introduction to Geometric Dimensioning and Tolerancing Introduction to Geometric Dimensioning and Tolerancing 7 it is not clear whether the lower edge of the part should be resting against the horizontal surface of the datum reference frame as in Fig. 1-6A or whether the left edge of the part should be in contact with the vertical surface of the datum reference frame as in Fig. 1-6B. Manufactured parts are not perfect. It is clear that when drawings are dimensioned with traditional tolerancing methods a considerable amount of information is left to the machinists and inspectors judgment. If a part is to be inspected the same way every time the drawing must specify how the part is to fit in the datum reference frame. All of the datums must be specified in order of precedence. A B Figure 1-6 Possible datum interpretation. Downloaded from Digital Engineering Library @ McGraw-Hill Copyright 2006 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Introduction to Geometric Dimensioning and Tolerancing 8 Chapter One Summary GD T is a symbolic language used to specify the size shape form orientation and location of features on a part. GD T was created to insure the proper assembly of mating parts to improve quality and to reduce cost. GD T is a design tool. GD T communicates design intent. This text is based on the standard Dimensioning and Tolerancing ASME . The cylindrical tolerance zone defines a uniform distance from true position to the tolerance zone boundary. The maximum material condition symbol in the feature control frame is a modifier that allows a bonus tolerance. All of the datums must be specified in order of precedence. Chapter Review 1. GD T is a symbolic language used to specify the ------------------ ---------------- ---------------- ----------------- and of features on a part. 2. Features toleranced with GD T reflect the between mating parts. 3. GD T

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