Chapter 5 Dimensioning in AutoCAD

1. Chapter 5Dimensioning in AutoCAD Topics

2. Dimensioning: Topics Summary 5.1) Introduction 5.2) Dimension Commands 5.3) Dimension Style 5.4) Dimension Variables 5.5) The DIM Prompt 5.6) Associative Dimensions 5.7) Annotative Objects

3. Dimensioning in AutoCAD Summary

4. Summary • What will we learn in Chapter 5? • The skills necessary to dimension an orthographic projection. • Key points • By default, dimensions are associative. If you manually type in a dimension, the associativity is broken.

5. Dimensioning in AutoCAD 5.1) Introduction

6. Introduction • AutoCAD automatically creates the dimensions and dimension text once a feature is selected. • Dimension appearance and properties may be adjusted in the Dimension Styles Managerwindow.

8. Dimensioning in AutoCAD 5.2) Dimension Commands

9. Dimensions Panel

10. Leaders Panel Collect Multileaders Align Multileader

11. Dimensioning in AutoCAD 5.3) Dimension Style

12. Dimension Style • The Dimension Style Manager is used to create: • New dimension styles, • set the current style, • modify styles, • set overrides on the current style, • and compare styles. • Access using: DDIM, DIMSTYLE or from the Dimensions panel

14. Multileader Style • The Multileader Style Manager is used to create: • New multileader styles, • set the current style, • and modify styles, • Access using: MLEADERSTYLE or from the Leaders panel.

16. Dimensioning in AutoCAD 5.4) Dimension Variables

17. Dimension Variables • Dimension appearance may be modified by changing dimension variables. • These variables may be set in the Dimension Styles Manager. • It is not uncommon to change some of these variables on the fly within the Command window.

18. Dimension Variables • Commonly used dimension variables • DIMSCALE: This command sets the overall size or scale factor of the dimensions. • DIMTIX: Forces dimension text inside extension lines. • DDEDIT: Edits dimension text. • DIMCEN:Controls size of the center marks drawn by diameter and radial dimensions. • UPDATE: Applies the changes. • Other variables are given in section 5.4)

19. Dimensioning • Creating and modifying dimensions. Live Demonstration

20. Dimensioning in AutoCAD 5.5) The DIM Prompt

21. The DIM Prompt • Within the Dim prompt (the dimension mode), you can type in dimensioning commands that allow you to create and modify dimensions. • DIM: Accessed the DIM prompt. • EXIT:Exits the DIM prompt.

22. Dimensioning in AutoCAD 5.6) Associative Dimensions

23. Associative Dimensions • Associative dimensions are associated (connected) with the dimensioned object. • If the object is changed, the associated dimension value will change. Live Demonstration

24. Associative Dimensions • Associativity is broken if... • You manually type in the dimension text • replace the dimension text • EXPLODE the dimension • Multileaders are not associative.

25. Dimensioning in AutoCAD 5.7) Annotative Objects

26. Annotative Objects • Annotative objects support multiple viewport scales. (Dimension, text, hatches ...) 1:2 scale 1:1 scale

27. Annotative Objects • Annotative objects support multiple viewport scales. (Dimension, text, hatches ...) 1:1 scale 2:1 scale

28. Annotative Objects • Each supported scale adds to the file size.

29. Annotation Scaling Panel

30. Dimensioning in AutoCAD End