SolidWorks 2010 Bible

CHAPTER

Using Equations

IN THIS CHAPTER

Using equations to create

relationships between

dimensions

Linking dimensions together

Assigning global variables

Entering expressions

Using equations tutorial

P

arametric sketch relations are not the only way to drive dimensions

with intelligence. You can also use equations, link values, and global

variables. Equations help you create simple or complex mathematical

relations between dimensions. Link values are essentially a quick way of

making two dimensions equal. Global variables can be used in equations

like other dimension names. These three techniques are all very similar and

related to one another in the interface, but are used in different ways in

different situations.

Equations can cause problems if used incorrectly, and have functionality

that may appear incorrect at times, but if you are familiar with how the tools

work, you can avoid the common pitfalls and get maximum benefit by

adding intelligence to your designs.

Understanding Equations

You can use the Equations tools to create simple or complex mathematical
relations between dimensions. You can find the Equations tool on the Tools
toolbar or by choosing Tools ➪ Equations from the menu. Equations are
stored in a folder at the top of the FeatureManager, Figure 9.1 shows the
Equations main interface along with the Add Equation window. As I have
noted with other areas of the interface, Equations still uses a floating dialog
box. SolidWorks has put most functions in the PropertyManager, but
equations tend to be more horizontal than vertical, while the PropertyManager
is more vertical than horizontal.