Creating a Grid

Using grids lets you position structures more easily as well as design in context. You can create structures referencing geometrical grid elements. Design changes can then be introduced by modifying the grid and updating the structure in consequence.
task target This task shows how to create a new grid that you can then use as a construction aid to create members.

A grid is made of wireframe elements (lines, points and planes) and is identified in the specification tree. It can be created using either the Cartesian or Polar coordinate system.

scenario 1. Click the Grid I_RefGridP2.gif (196 bytes)  icon.

The Grid Definition dialog box appears.

2. Enter a name for the grid you want to create in the Name box:

The grid will be identified by this name in the specification tree.

3. Select Relative or Absolute in the Mode list to define the grid construction mode.
  • In the absolute mode, grid planes are positioned with respect to the grid origin. Planes can be repositioned independently of one another.
  • In the relative mode, grid planes are positioned with respect to each other. Moving a plane impacts other planes offset from that plane. This is the default mode.
4. Enter absolute coordinates in the Origin box or select a point in the geometry area to define the grid origin.
If you select a point, the point is identified in the dialog box. The grid origin is now linked to this point.
5. In the First direction in XY plane box:
  • In the Cartesian tab, enter H and V coordinates to define the local x-axis.
  • Click the Polar tab and enter an angle to define the polar axis.
  • Select a line in the geometry area.

Note: By default, the local x-axis is positioned along the absolute x-axis.

If you select a line, the line is identified in the dialog box. The first direction is now linked to this line.
6. Specify grid coordinates:
  • In the Cartesian tab, specify the distance between grid points and number of points along x, y and z axes.
    In the Polar tab, specify the radius, amplitude and spacing along the z-axis as well as the number of grid points in each case.
Note: Clicking More expands the dialog box and lets you enter up to three more different combinations to define your grid.
7. Click OK to create the grid.

The grid is created and is identified in the specification tree.

gagrid01.gif (9721 bytes) gagrid02.gif (10556 bytes)
Grid planes are associative: moving a plane will update the grid.
This is useful when modifying a structure: move a plane (double-click to edit) and see the structure defined using the grid updated when you double-click the root product in the specification tree if the following options were set in the General tab in the Options dialog box (Tools -> Options, Infrastructure -> Part Infrastructure):
  • Keep link with selected object 
  • Synchronize all external references for update.
movegridplane02NLS.gif (7473 bytes) movegridplane03.gif (7510 bytes)
movegridplane04.gif (7293 bytes)

end of task