Autodesk AUTOCAD PLANT 3D 2011 - SYSTEM REQUIREMENTS, Tutorials Manual

Page: 236 / 840

Each curve group has a two-part entity number and a separate table row
for each spiral and curve. Values shown in black can be edited.
4 On the Alignment Layout Tools toolbar, click Sub-Entity Editor . The
Alignment Layout Parameters window is displayed, containing no data.
5 In the Alignment Entities table, click any row for segment no. 4, which
is the free spiral-curve-spiral entity in circle C in your drawing window.
The design data for all three sub-entities is displayed in a two-column
table in the Alignment Layout Parameters window, where data is easy to
review and edit.
If your design requires precise values for minimum curve radius, length,
or spiral A values, you can use the Alignment Layout Parameters window
to enter the values.
6 In the Alignment Layout Parameters window, change the Length value
for a spiral to a higher number, such as 100, and press Enter.
Note how this immediately increases the spiral length in three locations:
in both the Alignment Layout Parameters window and the Alignment
Entities table, numeric values change; in the drawing window, geometry
point labels move and their station values change, and the length of the
spiral itself changes.
Further exploration: Experiment with changing the curve radius. In the
Alignment Entities table, click a line or curve entity and note the data
that you can edit in the Alignment Layout Parameters window.
7 Press Esc to clear the Alignment Layout Parameters dialog box.
Display a range of sub-entities in the Alignment Entities vista
1 In the drawing, Ctrl+click the curve entity in circle B.
The Alignment Entities vista displays only the attributes for the curve
entity.
2 In the drawing, Ctrl+click the spiral-curve-spiral entity in circle C.
Notice that the Alignment Entities vista now displays the attributes for
each of the entities you selected, plus the tangent between them. To
display the parameters of another entity in the Alignment Layout
Parameters dialog box, click the appropriate row in the Alignment Entities
vista.
3 Press Esc to display all alignment entities on the Alignment Entities vista.
224 | Chapter 8 Alignments Tutorials