Introduction简介:
Written by one of the foremost authorities in the field, this reference presents proven and easy-to-use methods for determining whether selected dimensioning and tolerancing schemes will yield functional parts and assemblies. The book develops effective problem-solving and analytical skills using a variety of examples and real-world design challenges that stress the importance of a standardized approach to tolerance stackups. Illustrating procedures that have been tested and utilized by leading professionals in industry, this reference demonstrates how to perform "what-if" scenarios to evaluate the effects of changing tolerancing schemes, tolerance values, and assembly sequences.
Every product manufactured today is subject to variation. Typically, the manufacturing process is the source of this variation. From the peaks and valleys of integrated circuits in the microscopic regime to the buttons on
the cell phone in your pocket, to the large steel structures of dams and bridges in the macroscopic regime, no product or part is immune from variation and its sources. Understanding this variation and quantifying its
effect on the form, fit, and function of parts and assemblies are crucial parts of the mechanical design process.
Tolerances are engineering specifications of the acceptable levels of variation for each geometric aspect of a component or assembly. Although tolerances are typically specified on engineering drawings, it is becoming
popular for tolerances to be defined in a CAD file as attributes of a threedimensional solid model. Whether explicitly specified on a drawing or as part of a CAD model, tolerances indicate the variation allowed for part
and assembly features.
Tolerances may be used to control the variation allowed for individual feature geometry, such as form and size, or to control the geometric relationship between part and assembly features, such as orientation and location. Tolerance Analysis and Tolerance Stackups are the tools and techniques used to understand the cumulative effects of tolerances(accumulated variation) and to ensure that these cumulative effects are acceptable.....
Cover封面:
Table of Content目录:
1. Background
2. Dimensioning and Tolerancing
3. Tolerance Format and Decimal Places
4. Converting Plus/Minus Dimensions and Tolerances into Equal Bilaterally Toleranced Dimensions
5. Variation and Sources of Variation
6. Tolerance Analysis
7. Worst-case Tolerance Stackups
8. Statistical Tolerance Stackups
9. Geometric Dimensioning and Tolerancing (GD&T)
10. Converting Plus/Minus Tolerancing to Positional Tolerancing and Projected Tolerance Zones
11. Diametral and Radial Tolerance Stackups
12. Specifying Material Condition Modifiers and Their Effect on Tolerance Stackups
13. The Tolerance Stackup Sketch
14. The Tolerance Stackup Report Form
15. Tolerance Stackup Direction and Tolerance Stackups with Trigonometry
16. Putting it All Together: Tolerance Stackups with GD&T Solved Using the Advanced Dimensional Management Method
17. Calculating Component Tolerances Given a Final Assembly Tolerance Requirement
18. Floating-Fastener and Fixed-Fastener Formulas and Considerations
19. Fit Classifications
20. Form Tolerances in Tolerance Stackups
