Coordinate System
You can define a coordinate system for a part or assembly. Use this
coordinate system with the Measure
and Mass
Properties tools, and for exporting SolidWorks documents to
IGES, STL, ACIS, STEP, Parasolid, VRML, and VDA.
To create a coordinate system:
Click Coordinate
System 
on the Reference Geometry toolbar, or click
Insert,
Reference Geometry, Coordinate
System.
Use the Coordinate
System PropertyManager to create the coordinate system.
You can amend your selections:
To
change your selections, right-click in the graphics area and select Clear Selections.
To reverse the direction
of an axis, click its Reverse Axis Direction
button in the PropertyManager.
Click OK 
.
You may need to locate a coordinate system where there are insufficient
entities available to define the coordinate system. In this case, you
can define a coordinate system someplace on the part or assembly that
does provide the entities you need. Then you can move the new origin to
the desired location. The new location must contain at least one point
or vertex.
To translate a coordinate system to a
new location:
Click Coordinate
System or Insert, Reference Geometry,
Coordinate System.
Define the coordinate system at a location on
the part or assembly that provides the entities you need to control the
angle and direction of each axis.
Click in Origin,
then select the point or vertex to which you want to translate the origin.
-
Click OK. The origin moves
to the location that you selected.
When
you create a coordinate system, it is a good idea to give it a meaningful
name to explain its purpose. Click-pause-click the coordinate system’s
name in the FeatureManager design tree and enter a new name.
To toggle the display of coordinate systems:
Click View, Coordinate
Systems.
To hide or show individual coordinate
systems:
Right-click the coordinate system in the graphics
area or in the FeatureManager design tree.
-
Select Hide or Show.
Individual
coordinate systems always are highlighted when you select them, even when
hidden.