CREATING VOLUMES FROM SURFACES
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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
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In the Layers window, type the name of the new layer and click New
.
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Select the "prism" layer and click Layer To use to choose it as the
activated layer.
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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
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Select the "profile" layer and click Off to deactivate it.
Creating the volume of the prism
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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).
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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
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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
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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
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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).
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To create the volume defined by the translation, select Do Extrude Volumes
in the Copy window.
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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
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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.
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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
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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.
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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).
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Choose the option Do Extrude Volumes from the Copy window. The
volume that is defined by the translation will be created.
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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
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Click Select and select the surface of the wheel. Press ESC .
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Select the two layers and click them On so that they are visible.
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Choose Render
Flat from the
mouse menu to visualize a more realistic version of the model (Figure 27).
Figure 27. Image
of the wheel
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