CREATING VOLUMES FROM SURFACES |
The mechanical part to be constructed is composed of two volumes: the volume of the wheel (defined by the profile), and the volume of the axle, which is a prism with an octagonal base that fits into the hole in the wheel. Creating this prism will be the first step of this stage. It will be created in a new layer that we will name "prism".
Creating the "prism" layer and translating the octagon to this layer |
- In the Layers
window, type the name of the new layer and click New
.
- Select the "prism" layer and click Layer To use
to choose it as the activated layer.
- Choose Lines
in the Sent To
menu in the Layers
window. Select the lines that define the octagon. Press ESC
to conclude the selection.
Figure 21. The lines that form the octagon
|
|
- Select the "profile" layer and click Off
to deactivate it.
Creating the volume of the prism |
- First copy the octagon a distance of -50 units relative to the surface of the wheel, which is where the base of the prism will be located. In the Copy
window, choose Translation
and Lines
. Since we want to translate 50 units, enter two points that define the vector of this translation, for example (0, 0, 0) and (0, 0, 50). (Make sure that the Multiple Copies value is 1, since the last time the window was used its value was 9).
- Choose Select
and select the lines of the octagon. Press ESC
to conclude the selection.
Figure 22. Selection of the lines that form the octagon
|
|
- Since the Z axis is parallel to the user's line of vision, the perspective must be changed to visualize the result. To do this, use the Rotate Trackball
tool, which is located in the GiD Toolbox and in the mouse menu.
Figure 23. Copying the octagon and changing the perspective
|
|
- Choose Geometry->Create->NURBS surface->By contour
. Select the lines that form the displaced octagon and press ESC
to conclude the selection. Again, press ESC
to exit the function of creating the surfaces.
Figure 24. The surface created on the translated octagon
|
|
- In the Copy
window, choose Translation
and Surfaces
. Make a translation of 110 units. Enter two points that define a vector for this translation, for example (0, 0, 0) and (0, 0, -110).
- To create the volume defined by the translation, select Do Extrude Volumes
in the Copy
window.
- Click Select
and select the surface of the octagon. Press ESC
. The result is shown in Figure 25.
Figure 25. Creation of the volume of the prism
|
|
- Choose the option Render->Flat
from the mouse menu to visualize a more realistic version of the model. Then return to the normal visualization using Render->Normal
.
Figure 26. Visualization of the prism with the option RenderFlat.
|
|
NOTE
: The Color
option in the Layers
window lets you define the color and the opacity of the selected layer. This color is then used in the rendering of elements in that layer.
Creating the volume of the wheel |
- Visualize the "profile" layer and activate it. The volume of the wheel will be created in this layer. Deactivate the "prism" layer in order to make the selection of the entities easier.
- In the Copy
window, choose Translation
and Surfaces
. A translation of 10 units will be made. To do this, enter two points that define a vector for this translation, for example (0, 0, 0) and (0, 0, -10).
- Choose the option Do Extrude Volumes
from the Copy
window. The volume that is defined by the translation will be created.
- Make sure that the Maintain Layers
option is not checked, hence the new entities created will be placed in the layer to use; otherwise, the new entities are copied to the same layers as their originals
- Click Select
and select the surface of the wheel. Press ESC
.
- Select the two layers and click them On
so that they are visible.
- Choose Render->Flat
from the mouse menu to visualize a more realistic version of the model (Figure 27).
Figure 27. Image of the wheel
|
|