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Chapter 4 Working with Cross Sections
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Defining Subassemblies
If you are using a subassembly, then you must define it before you define the
template you will be attaching it to.
When you define a subassembly, you specify the connection-point-in, the
surface material, the connection-point-out, and the datum points. The
connection-point-in of the subassembly is attached to the connection-point-out
on the template. You can attach subassemblies to the connection-point-out on
either side of the template.
If a subassembly is attached to a cross section template, then the design slope
assigned in the Edit Design Control command is attached to the connection-
point-out of the subassembly instead of the connection-point-out of the
template.
NOTE
Ditches and design slopes are not created as part of the template or
subassembly. Define ditches and slopes by using the Edit Design Control
command.
Subassembly definition varies from template definition in a number of ways:
n
Subassemblies can only use one datum definition.
n
Transition points cannot be assigned to subassemblies. Therefore,
subassemblies cannot be stretched, but they can be moved. Since a
subassembly is attached to the cross section template at the templates
connection-point-out, the subassemblys final location will be affected by
transitioning applied to the template.
n
Although you can draw the template and subassembly in any order, you
must define the subassembly with the Define Subassembly command before
defining the template.
NOTE
The Draw Template command aids subassembly creation by taking the
vertical scale factor of the drawing into account. For example, if the
horizontal scale is set to 1"=40' and the vertical scale to 1"=20', then the
Draw Template command exaggerates the subassembly by a vertical scale
factor of two. The Define Subassembly command compensates for the
vertical scale factor of 2:1 and stores the subassembly definition with a
scale of 1:1. Do not change the scales between the time the subassembly is
drawn and the time it is defined or the subassembly will not be defined
properly.
After you have used the Draw Template command to draw the subassembly, use
the Define Subassembly command to define the subassembly. When you define
a subassembly, you define the connection-point-out, the connection-point-in,
the datum points, and specify the surface material.
To define a subassembly
1 You can set the template storage path with the Set Template Path command.
2 Draw the curb, cut shoulder, and fill shoulder subassembly regions as 2D
polylines with the Draw Template command or with the AutoCAD PLINE
command.