CREATE COORDINATE SYSTEM
This function is used to create a local coordinate system.
eta/DYNAFORM refers to the local coordinate system to translate, rotate, mirror, copy, and generate points, lines, or nodes. When the function is selected, the user needs to generate a local system designated as the UVW coordinate frame using the LCS dialog box as illustrated in Figure 11.15.2. The user can create a new LCS or select a coordinate system as the current LCS by selecting GLOBAL, CURRENT LCS, LAST, or VIEW DIRECTION.
Figure 11.15.2 LCS dialog box
DEFINED BY 3 LOCATIONS
This function enables user to define a local coordinate system through specifying three nodes/points.
Near Node: Define LCS by selecting three nodes. The first selected node will be defined the origin of the LCS. The coordinate value of the defined origin in Global system is also shown in below. User can edit it manually.
Near Point: Define WCS by selecting three geometry points. The first selected point will be defined the original of the LCS.
Reject Last Node/Point: Reject last selected node/point.
NOTE: If the user defines a LCS through the DEFINED BY 3 LOCATIONS option, at least one node/point need defined.
If only one node/point defined, the origin of the LCS is the defined node/point. The local U, V, W axis are parallel to the global X, Y, Z axis respectively.
If only two nodes/points defined, the origin of the LCS is the first selected node/point. The local W axis is the vector orientation from the first node/point to the second node/point.
If three nodes/points defined, the origin of the LCS is the first selected node/point. The local U axis is the vector orientation from the first node/point to the second node/point. The selected three nodes/points decided the local U-V plane. The local W axis is vertical with the U-V plane.
THROUGH U, V, W
This function enables user to define a local coordinate system through specifying the local U, V and W axis.
U Axis…: This function allows the user to define local U axis direction. After clicking this button, the DEFINE DIRECTION dialog box is displayed. The user may select any of the LCS in the list.
V Axis…: This function allows the user to define local V axis direction. After clicking this button, the DEFINE DIRECTION dialog box. The operation is the same as in U axis.
W Axis…: This function allows user to define local W axis direction. After clicking this button, the DEFINE DIRECTION dialog box is displayed. The operation is the same as U and V axes.
Note: The user may define U axis and V axis to define LCS. W direction is calculated according to the right hand rule.
W=U×V
The V axis is adjusted again from the W and U axis according to the right hand rule.
V=W×U
The user may only define W axis direction to define the LSC. The U, V direction is defined automatically. This option is useful when the local U and V direction are not important.
GLOBAL
Create a local coordinate system using the global coordinate system and set the new created LCS as the current LCS.
CURRENT LCS
Create a local coordinate system using the current LCS.
LAST DEFINED LCS
Create a local coordinate system using the last defined coordinate system and set the new created LCS as the current LCS..
VIEW DIRECTION
Define the view directions as the W-Axis of the current LCS. The user can select or define a point as the origin, or the origin of the global coordinate system can be the origin of the current LCS.
The DEFINED BY 3 LOCATIONS option enables the user to create a local coordinate system based on the selection of three reference points/nodes.