units

When dealing with any CAD program, it is vital to know what system of units you are currently working in. Without a system of units it would be impossible to know how large the object is that you are designing. What is the estimated weight of the object? What is the estimated inertia about the drive axis? Is the design within a balance specification? These questions would be difficult, if not impossible, to answer without knowing the unit system in the current part. As such, unit systems are very important when modeling.

The expression system in NX is "'unit aware" and can correctly handle a wide variety of unit types. This can make life easier since the designer no longer has to worry about unit conversions when creating expressions. Create a new length expression using units of centimeters, add an existing expression defined in inches to another defined in millimeters and you get the correct length expressed in centimeters.