Parallel Distance
Can be defined for pairs of geometry of all types. Defines a value between 2 features in a
parallel direction. The value of a distance dimension cannot be negative.
Perpendicular Distance
Can be defined for pairs of geometry of all types. Defines a value between 2 features
in a perpendicular direction. The value of a distance dimension cannot be negative.
Diameter
Can be defined for circular and arc geometry. Defines a value for the diameter of a circular feature.
Angle
Can be defined for pairs of linear geometry. Defines a value for the degrees between 2 linear features.
See also Path Angle.
Path Angle
Defines the sweep (angle direction) that the software uses to ensure that the 3D part is built
correctly. Path Angle appears as appears as PathA1, PathA2, etc. under Size Parameters in the Content Builder.
Constraints
Depending on the geometry of the model, you may need to add one or more constraints to define the shape
or size of the model. Constraints enforce rules that you want the model to obey. Constraining a model
controls how a model can change in shape or size, called “degrees of freedom.” For example, a circle has 2
degrees of freedom: the location of its center and its diameter. If the center and diameter are defined, the
circle is fully constrained and those values can be maintained. Constraints specify the relationships of
geometric features; for example, whether 2 features are perpendicular, parallel, tangent, concentric, or have
the same midpoint or radius.
NOTE
After you add geometry, dimensions, or constraints to the model, the degrees of freedom are listed on the
command line.
Constraints work in conjunction with dimensions to control the shape and size of the model. Any time you
modify the model, the geometry retains the relationships among features in accordance with the applied
constraints. You add constraints to indicate your design intent. For example, a parallel constraint could be
defined between 2 lines based on the geometry of the model. You could also add a constraint to force both
lines to have the same length.
As you apply geometric constraints, continue to analyze the model, reviewing and replacing constraints as
necessary. As you gain experience, you will be able to determine which constraints control the model to
meet your design requirements. Some constraints work only with lines, while others work only with arcs,
circles, or points.
Applying a tangent constraint
Applying a parallel constraint
Applying a perpendicular constraint
658 | Chapter 14 Customizing Catalog-Based Content
Summary of Contents for 235B1-05A761-1301 - AutoCAD MEP 2010
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