对于定向公差这一部分, ASME Y14.5-1994和ASME Y14.5-2009有何区别。

对于定向公差这一部分, ASME Y14.5-1994和ASME Y14.5-2009有何区别。

全部的变化都在下面列着：对工程技术人员应该能看懂。

1：
One of the major revisions is the reformatting of the Standard, the order of the sections and material within the sections without reversing any of the 1994 principles.
-Section 1 Scope, Definitions, and General Dimensioning
-Section 2 General Tolerancing and Related Principles
-Section 3 Symbology
-Section 4 Datum Reference Frames
2：
-Section 5 Tolerances of Form
-Section 6 Tolerances of Orientation
-Section 7 Tolerances of Location
-Section 8 –Tolerances of Profile
-Section 9 –Tolerances of Runout
3：
-Appendix A –Principle Changes and Improvements
-Appendix B –Formula for Positional Tolerancing
-Appendix C –Form, Proportion, and Comparison of Symbols
-Appendix D –Former Practices
-Appendix E –Decision Diagram for Geometric Controls
4：
•The sections were rearranged to make the flow of the material flow from the basic concepts to the more complex.
•Principle Revisions and Improvements-Revised definitions-New terms-Fundamental rules added
5：
Principle Revisions and Improvements (Cont)
-New symbology
-Degrees of Freedom emphasized for datums
-Datum selection example on a small assembly
6：
Principle Revisions and Improvements (Cont)
-Ability to add the value of a datum simulator in the feature control frame
-Datum shift added
-Added restrained parts-Simplified Orientation explanation
7：
Principle Revisions and Improvements (Cont)
-Major reformatting of section on location tolerances
-Expanded coverage of composite positional tolerancing
-Expanded coverage of profile tolerancing
8：
There will be an opportunity for questions following each presentation. The answers and comments are the opinion of the presenters and do not constitute an official ASME interpretation of the standard.追问你好！
首先谢谢你的回答，非常感谢，不过我只想知道关于-Section 6 Tolerances of Orientation
（定向公差）这一部分与以前的有什么不同，能不能稍微具体点 谢谢！！追答Section 6的具体变化：

Location of Orientation Tolerances Section
Orientation tolerances were formerly in Section 6 with form, profile, and runout. To better guide the user of the Standard in the application of geometric dimensioning and tolerancing, orientation tolerances now are in a separate section.

Definitions
The definitions of Angularity, Parallelism, and Perpendicularityare unchanged from ASME Y14.5M-1994. In that revision the description of the three orientation tolerances and their tolerance zones was repeated for each of the three types of tolerance. The only difference between the three descriptions was the terms angularity, parallelism, or perpendicularity. In this revision the description of the tolerances and their tolerance zones is only stated one time and applies to all three orientation tolerances.

Orientation Definition as Condensed：(见插图)

Angularity Symbol
The use of the angularity symbol meaning orientation is introduced as an alternative practice to using perpendicularity or parallelism.

Specifying Orientation for a plane surface relative to two datums （见标准图6.4）追问谢谢 非常感谢，答案很完善，如果是中文版的就好了 呵呵 我英语不行 翻译了半天才弄明白
嘿嘿 我英语不过关 不过总之很感谢你，对我的帮助很大 谢谢