1. In this chapter, you will learn the following:
Chapter 4: Applying Geometric Relations and Dimensions
In this chapter, you will learn the following:
Working with Geometric Relations
Applying Geometric Relations
Controlling the Display of Geometric Relations
Applying Dimensions
Modifying/Editing Dimensions
Modifying Dimension Properties
Working with Different States of a Sketch

2. Working with Geometric Relations
Chapter 4: Applying Geometric Relations and Dimensions
Working with Geometric Relations
Geometric relations are used to restrict some degrees of freedom of a sketch. You can apply geometric relations on a sketch entity, between sketch entities, and between sketch entities and planes, axes, edges, or vertices. Some geometric relations such as horizontal, vertical, and coincident are applied automatically while drawing sketch entities.

3. Various geometric relations are as follows:
Chapter 4: Applying Geometric Relations and Dimensions
Various geometric relations are as follows:
Horizontal Relation
Vertical Relation
Coincident Relation
Collinear Relation
Perpendicular Relation
Parallel Relation
Tangent Relation
Concentric Relation
Coradial Relation
Equal Relation
Equal Curve Length Relation
Midpoint Relation
Symmetric Relation
Merge Relation
Pierce Relation
Fix Relation

4. Applying Geometric Relations
Chapter 4: Applying Geometric Relations and Dimensions
Applying Geometric Relations
In SOLIDWORKS, you can apply geometric relations either by using the Add Relation tool or by using the Pop-up toolbar.
Applying Geometric Relation by using the Add Relation Tool
To apply the geometric relation by using the Add Relation tool, click on the arrow in the lower side of the Display/Delete Relations tool in the Sketch CommandManager. A flyout appears. In this flyout, click on the Add Relation tool. The Add Relations PropertyManager appears.

5. Chapter 4: Applying Geometric Relations and Dimensions
As soon as you select entities from the drawing area for applying relation, the Add Relations PropertyManager gets modified and the names of selected entities appear in the Selected Entities rollout.
Selected Entities
The Selected Entities rollout displays the list of entities selected for applying relations.
Existing Relations
The Existing Relations rollout is used to display the list of already applied relations between the selected entities.
Add Relations
The Add Relations rollout displays the list of all possible relations that can be applied between the selected entities.

6. Chapter 4: Applying Geometric Relations and Dimensions
Applying Geometric Relation by using the Pop-up Toolbar
In addition to applying geometric relations by using the Add Relations PropertyManager, you can apply relations by using the Pop-up toolbar. It is a time saving method. To apply geometric relations by using the Pop-up toolbar, select entities directly from the drawing area by pressing the CTRL key without invoking any tool. Next, release the CTRL key and do not move the cursor. A Pop-up toolbar appears near the tip of the cursor.
NOTE:
The availability of relations in the Pop-up toolbar depends upon the type of entities selected for applying relation.

7. Controlling the Display of Geometric Relations
Chapter 4: Applying Geometric Relations and Dimensions
Controlling the Display of Geometric Relations
You can control the display or visibility of the applied geometric relations by using the View Sketch Relations tool in the View (Heads-Up) toolbar.

8. Chapter 4: Applying Geometric Relations and Dimensions
Applying Dimensions
Once a sketch has been drawn and required geometric relations have been applied, you need to apply dimensions by using dimension tools. As SOLIDWORKS is a parametric software, the parameters of sketch entities such as length and angle are controlled or driven by dimension values.
The tools used to apply dimensions are grouped together in the Dimensions flyout.

9. Chapter 4: Applying Geometric Relations and Dimensions
Working with Smart Dimension tool
The Smart Dimension tool is used to apply dimension, depending upon the type of entity selected.

10. Chapter 4: Applying Geometric Relations and Dimensions
To apply dimensions by using the Smart Dimension tool, click on the Smart Dimension tool and then select the entity to be dimensioned from the drawing area. Next, click the left mouse button to specify the location of the dimension in the drawing area. The Modify dialog box appears.

11. Chapter 4: Applying Geometric Relations and Dimensions
Applying Horizontal Dimension by using the Smart Dimension tool

12. Chapter 4: Applying Geometric Relations and Dimensions
Applying Vertical Dimension by using the Smart Dimension tool

13. Chapter 4: Applying Geometric Relations and Dimensions
Applying Aligned Dimension by using the Smart Dimension tool

14. Chapter 4: Applying Geometric Relations and Dimensions
Applying Angular Dimension by using the Smart Dimension tool

15. Chapter 4: Applying Geometric Relations and Dimensions
Applying Diameter Dimension by using the Smart Dimension tool
Note:
You can also apply radius dimension to a circle.

16. Chapter 4: Applying Geometric Relations and Dimensions
Applying Radius Dimension by using the Smart Dimension tool
Note:
You can also apply diameter dimension to an arc.

17. Chapter 4: Applying Geometric Relations and Dimensions
Applying Linear Diameter Dimension by using the Smart Dimension tool
The Linear diameter dimension can be applied to a sketch of a revolved feature.

18. Working with Horizontal Dimension and Vertical Dimension tools
Chapter 4: Applying Geometric Relations and Dimensions
Working with Horizontal Dimension and Vertical Dimension tools
In additional to applying horizontal and vertical dimensions by using the Smart Dimension tool, you can also apply these dimensions by using the Horizontal Dimension and Vertical Dimension tools in the Dimension flyout.

19. Working with Ordinate Dimension tool
Chapter 4: Applying Geometric Relations and Dimensions
Working with Ordinate Dimension tool
The Ordinate Dimension tool is used to apply ordinate dimensions to a sketch. Ordinate dimensions are measured from a base entity. The base entity is defined as the starting point from where all other sketch entities are measured.

20. Chapter 4: Applying Geometric Relations and Dimensions
Applying Horizontal Ordinate Dimensions

21. Chapter 4: Applying Geometric Relations and Dimensions
Applying Vertical Ordinate Dimensions
TIP:
Similar to applying horizontal and vertical ordinate dimensions by using the Ordinate Dimension tool, you can apply horizontal and vertical ordinate dimensions by using the Horizontal Ordinate Dimension and Vertical Ordinate Dimension tools, respectively.

22. Modifying/Editing Dimensions
Chapter 4: Applying Geometric Relations and Dimensions
Modifying/Editing Dimensions
After applying dimensions, you may need to modify them due to changes in the design, revisions in the design, and so on. To modify the already applied dimension, click on the dimension to be modified. The Dimension Input Value box appears with the display of current dimension value in the drawing area. Enter the new dimension value in this box and then press ENTER.
NOTE:
When you click on a dimension, the Dimension Input Value box appears only if the Instant2D tool is activated in the Sketch CommandManager.

23. Modifying Dimension Properties
Chapter 4: Applying Geometric Relations and Dimensions
Modifying Dimension Properties
In SOLIDWORKS, when you apply a dimension, it is applied with default properties. You can modify default dimension properties such as dimension style, tolerance, and precision by using the Dimension PropertyManager. To invoke the Dimension PropertyManager, select a dimension whose properties is to be modified.

24. Working with Different States of a Sketch
Chapter 4: Applying Geometric Relations and Dimensions
Working with Different States of a Sketch
In SOLIDWORKS, a sketch can be either Under defined, Fully defined, or Over defined.
Under defined Sketch

25. Chapter 4: Applying Geometric Relations and Dimensions
Fully defined Sketch
NOTE:
The sketch shown in above figure is a fully defined as all its entities are dimensioned and the required geometrical relations have been applied.

26. Chapter 4: Applying Geometric Relations and Dimensions
Over defined Sketch

27. Chapter 4: Applying Geometric Relations and Dimensions
When you apply an over defined dimension to an entity, the Make Dimension Driven? dialog box appears.

28. Tutorial 1 Chapter 4: Applying Geometric Relations and Dimensions
Draw the sketch as shown in figure given below and make it fully defined by applying all dimensions and relations. The model shown in this figure is for your reference only. You will learn how to create 3D models in the later chapters. All dimensions are in mm.
To create this tutorial, follow the steps given in the textbook.

29. Tutorial 2 Chapter 4: Applying Geometric Relations and Dimensions
Draw the sketch as shown in the figure given below and make it fully defined by applying all the dimensions and relations. You will learn how to create a 3D model in the later chapters. All dimensions are in mm.
To create this tutorial, follow the steps given in the textbook.

30. Tutorial 3 Chapter 4: Applying Geometric Relations and Dimensions
Draw the sketch as shown in the figure given below and make it fully defined by applying all dimensions and relations. The model shown in this figure is for your reference only. You will learn about creating a model in later chapters. All dimensions are in mm.
To create this tutorial, follow the steps given in the textbook.

31. Chapter 4: Applying Geometric Relations and Dimensions
Hands-on Test Drive 1
Draw the sketch as shown in the figure given below and apply dimensions to make it fully defined. The model shown in the figure is for your reference only. You will learn about creating a model in later chapters.

32. Chapter 4: Applying Geometric Relations and Dimensions
Hands-on Test Drive 2
Draw the sketch as shown in the figure given below and apply dimensions to make it fully defined. The model shown in the figure is for your reference only. You will learn about creating a model in later chapters.

33. Summary Chapter 4: Applying Geometric Relations and Dimensions
In this chapter, you have learned about creating fully defined sketches by applying geometric relations and dimensions. Also, you have learned about applying geometric relations by using the Add Relation tool and the Pop-up toolbar. Once the sketch has been drawn and the required geometric relations have been applied, dimensions need to be applied by using various dimension tools. The already applied dimensions and dimension properties such as dimension style, tolerance, and precision can also be modified. In this chapter, you have also learned about different sketch states such as under defined, fully defined, and over defined.

34. Questions Chapter 4: Applying Geometric Relations and Dimensions
The ________ relation is used to coincide a sketch point on to a line, an arc, or an elliptical entity.
You can control the display or visibility of the applied geometric relations by using the ________ tool.
The ________ dimension is applied to a sketch representing revolve features.
The ______ dimensions are measured from a base entity.
All degrees of freedoms of a ______ sketch are fixed.
The availability of the suggested relations in the Pop-up toolbar depends upon the type of entities selected. (True/False).

35. Chapter 4: Applying Geometric Relations and Dimensions
You cannot modify the dimensions once they have been applied. (True/False).
You cannot delete the relations that have already been applied between the selected entities. (True/False).
Geometric relations are used to restrict some degree of freedom of a sketch (True/False).