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256 | Chapter 12 Creating Parts
The part is symmetrical. Visualize two perpendicular centerlines—one along
the axis of the boss and another intersecting both lugs. As you create this
part, consider this symmetry as you constrain features.
As you build the saddle bracket, you learn to create features according to
the relationships among them. In this case, the base feature of the part is
the saddle and lugs. Because the remaining features attach to the saddle and
lugs, you create the main shape first. The next feature you create is the boss
because it rests directly on the saddle. Finally, you create the ribs because
they attach to both the saddle and the boss.
Creating Rough Parts
In the saddle bracket, features are present but lack details such as the arch of
the saddle, the mounting holes for the lugs, and the pipe hole for the boss.
Despite the missing details, the shape of the part and the placement of fea-
tures are symmetrical. Working from this basic part, you will add those
details.
Dimensioning and Constraining Parts
You apply dimensions and constraints to control the size and shape of a part,
and the position of part features. Dimensions can be expressed as numbers,
parameters, or equations.
You can use the Design Variables dialog box to create equations and control
the relationships between the dimensions on your model. Then you apply
the variables to your model and the model is updated to reflect the changes.
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