

Select Insert > Axis System from the menu bar
or click Axis System
.
The
Axis System Definition dialog box is displayed. 

An axis system is composed of an origin point and three
orthogonal axes. For instance, you can start by selecting the vertex
as shown to position the origin of the axis system you wish to
create. The application then computes the remaining coordinates. Both
computed axes are then parallel to those of the current system. The
axis system looks like this: 

It can be right or lefthanded.
This information is displayed within the
Axis System Definition
dialog box.
You can choose from different types of axis system: 

Standard: defined by a point of origin
and three orthogonal directions.
If an axis system is selected before launching the command, the new
axis system is a copy of the preselected axis system. Moreover, if
the compass is attached to the 3D geometry, the new axis system
orientations are the same as the compass'. Otherwise, the new axis
system orientations are as per the current axis system's.
Here only the point was selected and nothing specified for the
axes.


Axis rotation: defined as a standard
axis system and a angle computed from a selected reference.
Here the Y axis was set to the standard axis system Y axis, and
a 15 degrees angle was set in relation to an edge parallel to the X
axis.


Euler angles: defined by three angle
values as follows:
Angle 1= (X, N)
a rotation about Z
transforming vector X into vector N.
Angle 2= (Z, W)
a rotation about vector N transforming
vector Z into vector W.
Angle 3= (N, U)
a rotation about vector W


Select the point as shown to position the origin of the
axis system you wish to create. The application then computes the
remaining coordinates. Both computed axes are then parallel to those of
the current system. The axis system looks like this:


Instead of selecting the geometry to define the origin point, you
can use one of the following contextual commands available from the
Origin field: 

 Create Point: for more information, refer to
Points
 Coordinates: for more information, refer to
Points
 Create Midpoint: the origin point is the midpoint
detected by the application after selection of a geometrical
element.


 Create Endpoint: the origin point is the endpoint
detected by the application after selection of a geometrical
element.



If you are not satisfied with x axis, for instance click
the X Axis field and select a line to define a new direction
for x axis.
The x axis becomes collinear with this line. 


 It can be a line created along
the surface edge, for example, using the Create
Line contextual menu on the selection field, and
selecting two surface vertices.
Similarly you can create points, and
planes.
 You can also select the Rotation... contextual menu,
and enter an angle value in the X Axis Rotation dialog box.




Click the y axis in the geometry to reverse it.
Checking Reverse next to the Y Axis field
reverses its direction too. 


You can also define axes through coordinates. Rightclick
the Z Axis field and select the Coordinates... contextual
command. The Z Axis dialog box appears.

Key in X = 1, retain the Y and Z coordinates, and click
Close.
The axis system is modified accordingly, and is now
lefthanded. 


If you select one or more directions, the other inputs
(directions and origin if not specified) are automatically computed.
If you do not select any origin or directions, the system
automatically computes them for the creation of the axis system.
However, when editing the axis system, automatically computed origin
or directions fields are filled with "Coordinates" as if they had
been explicitly specified. 

Click More... to display the More... dialog
box.

The first row contains the coordinates of the origin point. The
coordinates of X axis are displayed in the second row. The
coordinates of Y and Z axis are displayed in the third and fourth row
respectively. 
 If no value is selected, the new axis
system matches the current one.
 If the origin is selected, the new axis system origin is set to
the origin.
 The first specified axis defines the corresponding axis of new
axis system.
i.e., if the xaxis is specified by Line.1, then the xaxis of new
system is a vector along Line.1.
 The second specified axis defines the plane between the
corresponding first and second axes of the new axis system.
i.e., if the zaxis is specified by Line.2, then the xz plane is
defined by the plane between vectors along Line.1 and Line.2.
 The third specified axis defines the orientation of the
corresponding axis of new axis system.
i.e., if the yaxis is specified by Line.3, then Line.3 defines
which side of the xz plane the yaxis of new system lies.
 The order of selection of the axes is important: to change the
order, select the No Selection contextual item on the
appropriate axes.
For instance, if the axes have been selected in the order x, y, z
and you wish to change the order to x, z, y, you must select the
No Selection contextual item on y, and select it again.


Uncheck Current if you do not want to set your
axis as the reference. The absolute axis at the bottom right of the
document then becomes the current three axis system.

Uncheck Under
the Axis Systems node if you do not want the axis system to be
created within the Axis system node in the specification tree.

It will be created either in the current geometrical
set or right after the current object in an ordered geometrical set.
In this case, the axis system becomes the new current object. 



This option is not persistent and not stored in the feature. 

Click OK.
The axis system is created.
When it is set as current, it is highlighted in the specification
tree. 

Rightclick Axis System.1 from the specification tree and
select the Axis System.1 object > Set As Current contextual
command. Axis System.1 is now current. You can then select one of its
plane, to define a sketch plane for example.

 You can change the location of the axis
system and put it in a geometrical set.
To do so, select it in the specification tree, rightclick and
select Axis System.1 object > Change Geometrical Set.
Choose the destination of the axis system using the dropdown list.
 If you create a point using the
coordinates method and an axis system is already defined and set as
current, the point's coordinates are defined according to current
the axis system. As a consequence, the point's coordinates are not
displayed in the specification tree.
 You can contextually retrieve the current local axis direction.
 You can use the Shift key
while creating the axis system to select the implicit elements that
belong to the axis system.
 There is an associativity between the
feature being created and the current local axis system. Therefore
when the local axis system is updated after a modification, all
features based on the axis direction are updated as well.
 Local axes are fixed. If you wish to constrain them, you need
to isolate them (using Isolate contextual command)
before setting constraints otherwise you would obtain
overconstrained systems.
 The display mode of the axes is
different depending on whether the threeaxis system is
righthanded or lefthanded and current or not.
ThreeAxis System 
Current 
Axis Display Mode 
righthanded 
yes 
solid 
righthanded 
no 
dashed 
lefthanded 
yes 
dotted 
lefthanded 
no 
dotdashed 

