Autodesk 057A1-05A111-1001 Getting Started Guide - Page 140

Dimensions Overview, Parts of a Dimension, Associative Dimensions and Leaders

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Dimensions Overview Dimensions show the geometric measurements of objects, the distances or angles between objects, or the location of a feature. Four general types of dimensions are available: ■ Linear. Measures distances using horizontal, vertical, aligned, rotated, baseline (parallel), and continued (chain) dimensions. ■ Ordinate. Measures the distance of a point from a specified origin point. ■ Radial. Measures the radii and diameters of arcs and circles. ■ Angular. Measures the angle formed by two lines or three points. Parts of a Dimension Dimensions have several distinct elements: ■ Dimension line. Indicates the direction and extent of a dimension. For angles, the dimension line is an arc. ■ Extension line. Extends from the feature being dimensioned to the dimension line. ■ Dimension text. Reflects dimension value and may include prefixes, suffixes, and tolerances. Alternatively, you can supply your own text or suppress the text entirely. ■ Arrowhead. Indicates an end of the dimension line. Several types of arrowheads are available, including architectural ticks and dots. ■ Leader. Forms a solid line leading from an annotation to the referenced feature. Depending on the dimension style, leaders can be created automatically when dimension text won't fit between extension lines. You can also create leader lines to connect text or a block with a feature. dimension text arrowhead dimension line extension line leader Associative Dimensions and Leaders By default, dimensions are associative. The measurements displayed by associative dimensions are updated automatically as you modify the objects with which they are associated. Leader objects are composed of text, a leader line, and an arrowhead. ■ If the text portion of a leader object is moved, the leader line is also adjusted. ■ If a leader object is associated with a geometric object, and the object is moved, stretched, or scaled, the arrowhead and the leader portion of the leader object are also updated. 134 | Chapter 10 Add Dimensions

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134
|
Chapter 10
Add Dimensions
Dimensions Overview
Dimensions show the geometric measurements of objects, the distances or angles between objects,
or the location of a feature. Four general types of dimensions are available:
■
Linear
.
Measures distances using horizontal, vertical, aligned, rotated, baseline (parallel), and
continued (chain) dimensions.
■
Ordinate
.
Measures the distance of a point from a specified origin point.
■
Radial
.
Measures the radii and diameters of arcs and circles.
■
Angular
.
Measures the angle formed by two lines or three points.
Parts of a Dimension
Dimensions have several distinct elements:
■
Dimension line
.
Indicates the direction and extent of a dimension. For angles, the dimension line
is an arc.
■
Extension line
.
Extends from the feature being dimensioned to the dimension line.
■
Dimension text
.
Reflects dimension value and may include prefixes, suffixes, and tolerances.
Alternatively, you can supply your own text or suppress the text entirely.
■
Arrowhead
.
Indicates an end of the dimension line. Several types of arrowheads are available,
including architectural ticks and dots.
■
Leader
.
Forms a solid line leading from an annotation to the referenced feature. Depending on
the dimension style, leaders can be created automatically when dimension text won’t fit between
extension lines. You can also create
leader lines
to connect text or a block with a feature.
Associative Dimensions and Leaders
By default, dimensions are
associative
. The measurements displayed by associative dimensions are
updated automatically as you modify the objects with which they are associated.
Leader objects are composed of text, a leader line, and an arrowhead.
■
If the text portion of a leader object is moved, the leader line is also adjusted.
■
If a leader object is associated with a geometric object, and the object is moved, stretched, or
scaled, the arrowhead and the leader portion of the leader object are also updated.
dimension line
extension line
dimension text
arrowhead
leader