Autodesk 235B1-05A761-1301 - AutoCAD MEP 2010, User Manual

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5 Under Termination, select Blind for Type, enter 15" (381 mm) for Distance, and click Flip. Click
OK.
A box is created to represent the junction box and an extrusion modifier is added to Modifiers
in the part browser.
6 To add the knockout, in the part browser, right-click XY Plane and click Add Geometry
➤
Point.
7 In the modeling area, specify a point near the center of the top of the junction box, and press
ENTER .
8 To constrain the point to the exact center of the top of the junction box, in the part browser,
right-click XY Plane and click Add Constraints
➤
Equal Distance.
9 In the modeling area, specify the pairs of geometric constraints.
For the first pair, select the point in the top center of the junction box, and then the lower-left
edge of the rectangular profile.
For the second pair, select the point in the top center of the junction box, and then the
upper-right edge of the rectangular profile.
NOTE When adding constraints, you may be prompted that the geometry is unconstrained by a
specific number of dimensions. These prompts are for informational purposes only to assist you during
the modeling process. It is recommended that you add a minimum number of constraints to define
the shape of the part to avoid undesirable results.
10 Repeat steps 8 and 9 to constrain the center point to the upper-left and lower-right edges of the
top face.
The model of the junction box is updated to the specified constraints.
11 In the part browser, right-click XY Plane and click Add Profile
➤
Circular.
716 | Chapter 14 Customizing Catalog-Based Content