About Creating Radial Dimensions
Radial dimensions measure the radii and diameters of arcs and circles with optional
centerlines or a center mark.
There are two types of radial dimensions:
- DIMRADIUS measures the radius of an arc or circle, and displays the dimension text
with the letter R in front of it.
- DIMDIAMETER measures the diameter of an arc or circle, and displays the dimension
text with the diameter symbol in front of it.
For horizontal dimension text, if the angle of the radial dimension line is greater
than 15 degrees from horizontal, a hook line, also called a dogleg or landing, one arrowhead long, is created next to the dimension text.
Control Extension Lines
When an arc is dimensioned, the radial or diametric dimension does not have to be
positioned along the arc directly. If a dimension is positioned past the end of an
arc, either an extension line will be drawn that follows the path of the arc being
dimensioned or no extension line will be drawn. When the extension line is suppressed
(off), the dimension line of the radial or diametric dimension is drawn through the
center point of the arc instead of to the extension line.
The DIMSE1 system variable controls whether or not a radial or diametric dimension
will be drawn with an extension line when it is positioned off the end of an arc.
When the display of the arc extension line is not suppressed, a gap between the arc
and arc extension line is made. The size of the gap drawn is controlled with the DIMEXO
Control Centerlines and Center Marks
Depending on your dimension style settings, center marks and lines generate automatically
for diameter and radius dimensions. They are created only if the dimension line is
placed outside the circle or arc. You can create centerlines and center marks directly
with the DIMCENTER command.
You can control the size and visibility of centerlines and center marks with the DIMCEN
system variable and in the Dimension Style dialog box.
The size of the centerline is the length of the centerline segment that extends outside
the circle or arc. It is also the size of the gap between the center mark and the
start of the centerline. The size of the center mark is the distance from the center
of the circle or arc to the end of the center mark.
Create Jogged Radius Dimensions
With the DIMJOGGED command, you can create jogged radius dimensions, also called
â€œforeshortened radius dimensions,â€ when the center of an arc or circle is located
off the layout and cannot be displayed in its true location. The origin point of the
dimension can be specified at a more convenient location called the center location override.
You can control the default angle of the jog in the Dimension Style dialog box, under
Radius Dimension Jog.
Once a jogged radius dimension is created, you can modify the jog and the center location
- Using grips to move the features
- Changing the locations of the features with the Properties palette
- Using the STRETCH command
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