2. Unit 9 Dimensioning

3. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Learning Objectives Identify terms and measurements associated with dimensioning mechanics. Identify symbols that have been standardized for dimensioning notations. Explain the choice and placement rules drafters use when creating dimensions.

4. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Learning Objectives Identify and discuss various systems and methods for dimensioning. Describe the additional types of dimensions used in special ways. Discuss alternative methods for describing size and applying dimensions.

5. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dimensioning Mechanics Dimensioning mechanics involves the size and spacing for all components of the dimension

6. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Standard Dimensioning Symbols

7. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Placement of Dimensional Values

8. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Small Dimension Mechanics

9. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Angular Dimension Mechanics

10. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Oblique Extension Lines

11. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dimensioning Rules of Choice and Placement Contour rule

12. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dimensioning Rules of Choice and Placement Cylinder rule

13. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dimensioning Rules of Choice and Placement Bolt circles

14. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dimensioning Rules of Choice and Placement Angles

15. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dimensioning Rules of Choice and Placement Baseline dimensioning

16. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dimensioning Rules of Choice and Placement Rounded ends

17. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Reference Dimensions Not for manufacturing purposes Informational reference only

18. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Tabular Dimensions Dimensions placed in table for clarity Allows for multiple parts on one drawing

19. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Hole Charts Often used for a part with a large number of repetitive features

20. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Coordinate Dimensioning without Dimension Lines Also called ordinate dimensioning, arrowless dimensioning, or datum dimensioning

21. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Dual Dimensioning Values in U.S. customary and metric units are both given, with one value in brackets

22. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Digital Product Definition Annotations attached to 3D models Drawing graphic sheet can be included

23. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Undimensioned Drawings Describes size of an object without annotations True geometry view = true profile of part Parts with irregular contours: –Printed circuit boards –Wire harnesses –Formed sheet metal sections

24. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. What do you see? Print supplied by Hydro-Gear