tailieunhanh - Geometric Dimensioning and Tolerancing for Mechanical Design Part 11

Tham khảo tài liệu 'geometric dimensioning and tolerancing for mechanical design part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Source Geometric Dimensioning and Tolerancing for Mechanical Design Chapter 12 Profile Profile is a surface control. It is a powerful and versatile tolerancing tool. It may be used to control just the size and shape of a feature or the size shape orientation and location of an irregular-shaped feature. The profile tolerance controls the orientation and location of features with unusual shapes very much like the position tolerance controls the orientation and location of holes or pins. Chapter Objectives After completing this chapter you will be able to Specify a profile tolerance Explain applications of a profile tolerance zone Properly apply datums for the profile tolerance Explain the need for a radius control with a profile Explain the combination of a profile tolerance with other geometric controls Specify coplanarity Properly apply composite profile tolerancing Definition A profile is the outline of an object. Specifically the profile of a line is the outline of an object in a plane as the plane passes through the object. The profile of a surface is the result of projecting the profile of an object on a plane or taking cross sections through the object at various intervals. 187 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. Profile 188 Chapter Twelve Specifying Profile A profile view or section view of a part is dimensioned with basic dimensions. A true profile may be dimensioned with basic size dimensions basic coordinate dimensions basic radii basic angular dimensions formulas or undimensioned drawings. The feature control frame is always directed to the profile surface with a leader. Profile is a surface control the association of a profile tolerance with an extension or a dimension line is inappropriate. The profile feature control frame contains the profile of a line or of a surface .