autocad dimensioning commandsedt 310 - chapter 18 - basic dimensioning practices 5 dimlinear command...
TRANSCRIPT
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 1
AutoCAD Dimensioning Commands
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 2
Dimensioning Commands
DLI DIMLINEAR
DAL DIMALIGNED
DAN DIMANGULAR
DBA DIMBASELINE
DCE DIMCENTER
DCO DIMCONTINUE
DED DIMEDIT
DRA DIMRADIUS
DDI DIMDIAMETER
DOR DIMORDINATE
DOV DIMOVERRIDE
DST DIMSTYLE
LE LEADER
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 3
The DIMLINEAR Command
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 4
DIMLINEAR Command
Use DIMLINEAR command for Length
Width
Depth
Use DIMLINEAR for Linear dimensions – (X,Y, Z)
Horizontal
Vertical
Slanted surfaces
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 5
DIMLINEAR Command
All dimension components are placed automatically by AutoCAD.
Extension lines.
Dimension lines.
Dimension text and arrowheads.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 6
DIMLINEAR Command
To DIMLINEAR command:
Pick the Linear Dimension button on the
Dimension toolbar.
OR
Pick Linear from the Dimension pull-down
menu.
OR
Type DLI or DIMLINEAR at the Command:
prompt.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 7
DIMLINEAR Command
Command Sequence:
Command: DLI or DIMLINEAR
Pick First extension line origin.
Pick Second extension line origin.
Pick Location of dimension.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 8
First Extension Point
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 9
Second Extension Point
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 10
Dimension Location
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 11
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 12
DIMLINEAR Command
When picking extension line origins:
Use one of the OSNAP modes for accuracy.
ENDpoint is a good one to use.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 13
DIMLINEAR Command
The DIMLINEAR command allows you to generate dimensions that are
Horizontal.
Vertical.
Aligned with a slanted surface.
Rotated at a specified angle.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 14
DIMLINEAR Command
Command: DIMLINEAR
The following prompt appears:
Dimension line location (Mtext/Text/Angle/Horizontal Vertical/Rotated)
Notice submenu choices
Mtext
Text
Angle
Horizontal
Vertical
Rotated
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 15
DIMLINEAR Command
Dimension line location
Is the default option selection.
Click the location where you want the dimension
line.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 16
DIMLINEAR Command
Mtext
Accesses the Multiline Text Editor.
The << >> (Chevrons) indicate the current
dimension value.
The < > is an intelligent value.
Normally, you should NOT delete the < >.
If you want the dimension changed, delete < >.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 17
MTEXT Option
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 18
DIMLINEAR Command
Text (Uses DTEXT) Uses the Command Line to change the dimension
text.
Angle Allows you to change the dimension text angle.
Horizontal Sets dimensions to horizontal distances only.
Vertical Sets dimensions to vertical distances only.
Rotated Allows you to change the angle for dimension line.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 19
Text Option chosen
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 20
Angle
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 21
Vertical
Horizontal
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 22
Rotated
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 23
The DIMALIGNED Command
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 24
Dimensioning Angled Surfaces
DIMALIGNED
Use for dimensioning a surface drawn at an
angle.
DIMALIGNED
functions similarly to the DIMLINEAR
command
aligns dimension lines with the surface.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 25
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 26
The QDIM Command
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 27
The QDIM Command
For DLI and DAL,
You must pick the extension line origins.
QDIM
Lets you pick a geometry
Circle, Rectangle, etc.
Extension line origins are AUTOMATICALLY
selected.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 28
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 29
The DIMANGULAR Command
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 30
DIMANGULAR Command
Use DIMANGULAR command to
Dimension the included angle of an arc.
The arc’s center point becomes the angle
vertex and
the two arc endpoints are the origin.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 31
Origin
Endpoint
Endpoint
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 32
DIMANGULAR Command
Use DIMANGULAR command to dimension part of a circle.
First pick point on a circle becomes the
endpoint of the first extension line.
Second pick point becomes the endpoint of
the second extension line.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 33
Origin
Endpoint
Endpoint
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 34
DIMANGULAR Command
Access the DIMANGULAR command by:
Pick the Angular Dimension button on the
Dimension toolbar
Pick Angular in the Dimension pull-down
menu
Type DAN or DIMANGULAR at the
Command: prompt.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 35
DIMANGULAR Command
If there is enough room, AutoCAD will
Place the
Dimension text
Dimension line arc, and
Arrowheads inside the the extension lines.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 36
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 37
DIMANGULAR Command
If there is not enough room AutoCAD will
Place the arrowheads outside and
Place the number outside the dimension lines.
If space is very small, ALL will be placed outside.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 38
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 39
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 44
Datum Dimensioning
DIMBASELINE
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 45
Datum Dimensioning
In Datum or Baseline dimensioning, dimensions originate from common surfaces, centerlines or center planes.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 46
Datum Dimensioning
Datum Dimensioning is commonly used in mechanical drafting because each dimension is independent of the others.
AutoCAD refers to Datum Dimensioning as DIMBASELINE or DBA
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 47
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 48
Chain Dimensioning
DIMCONTINUE
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 49
Chain Dimensioning
Chain dimensioning
Is rarely used in mechanical drafting.
has less accuracy, since each dimension is
dependent on the previous dimensions.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 51
Chain Dimensioning
If chain dimensioning is used, include an overall dimension to help insure accuracy.
AutoCAD refers to chain dimensioning as DIMCONTINUE.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 52
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 53
Chain Dimensioning
Chain Dimensioning is commonly used in architectural drafting.
Architectural drafting commonly also shows an overall dimension with the chain dimensioning.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 54
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 55
Datum Dimensioning
AutoCAD refers to datum dimensioning as Baseline dimensioning.
Use the DIMBASELINE command.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 56
Datum Dimensioning
Use the DIMBASELINE command to perform baseline dimensioning.
Pick the Baseline Dimension button in the
Dimension toolbar
OR
Pick Baseline in the Dimension pull-down
menu
OR
Type DBA or DIMBASELINE at the
Command: prompt
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 57
Datum Dimensioning
A dimension must exist first before the DIMBASELINE command can be used.
AutoCAD will use the most recently drawn dimension unless you specify another one.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 58
Datum Dimensioning
In datum dimensioning
AutoCAD automatically spaces and places
Extension lines.
Dimension lines.
Arrowheads.
Numbers.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 60
Chain Dimensions
Create chain dimensions by:
Picking the Continue Dimension button in the
Dimension toolbar
OR
Picking Continue in the Dimension pull-down
menu
OR
Typing DCO or DIMCONTINUE at the
Command: prompt
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 61
The QDIM Command
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 62
The QDIM Command
The QDIM command
makes chain and datum dimensioning even
easier.
It eliminates the need to define the exact
points being dimensioned.
Automates the process of point selection.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 63
The QDIM Command
QDIM can be selected by:
Selecting QDIM from the Dimension pull-
down menu
OR
Picking the Quick Dimension button from the
Dimension toolbar
OR
Typing QDIM at the Command: prompt.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 64
The QDIM Command
Single Polyline:
QDIM draws linear dimensions to every
vertex.
Single arc or circle:
QDIM draws a radius or diameter dimension.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 65
The QDIM Command
Multiple Objects: QDIM draws
Linear dimensions to the vertex of every line
or polyline.
Linear dimensions to the center of every arc
or circle.
AutoCAD finds these points automatically.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 66
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 67
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 68
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 69
Inserting Dimensioning Symbols
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 70
Inserting Symbols
After you select a feature to dimension, AutoCAD responds with the measurement or dimensioning number.
If the object is a circle or radius, AutoCAD automatically places the radius (R) or diameter () symbols before the dimension number.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 71
Inserting Symbols
AutoCAD does not place a symbol automatically in linear dimensioning.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 72
Inserting Symbols
Use the Mtext editor to insert other symbols.
Place the text cursor in the location where you want the symbol placed
Open the Symbol drop-down list
Select the symbol
Click OK.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 73
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 74
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 75
Creating Your Own Symbols
If a needed symbol does not exist, you can draw it and insert it on the drawing.
It is faster to create your own symbols, save them as a block and insert the block on the drawing as needed.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 76
The Circle Center Mark
and
DIMCEN
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 77
Circle Center Dashes
Circles are dimensioned to the CENTER of the circle.
AutoCAD will easily draw a centermark that can be “dimensioned to”.
The command is DIMCENTER
The mark size is set by the DIMCEN variable
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 78
Circle Center Dashes
To draw the center dashes:
Pick the Center Mark button on the Dimension
Toolbar
Pick Center Mark in the Dimension pull-down
menu
Type DCE or DIMCENTER at the Command:
prompt
When the arc or circle is picked, the center marks are automatically drawn.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 79
DIMCEN Variable
The DIMCEN variable controls the center dashes.
The default length is 0.09” long.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 80
DIMCEN Variable
If DIMCEN = 0; center marks are not drawn.
If DIMCEN < 0; AutoCAD draws
Complete centerlines that extend past the
edge of the circle.
Center dashes.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 81
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 82
DIMCEN Variable
If DIMCEN > 0; AutoCAD draws
Center dashes ONLY.
No extension lines outside the circle.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 83
DIMCEN Variable
The value of the DIMCEN variable sets
The length of the center dashes and
The length of the extension lines past the
edge of the circle.
DIMCEN = 0.09. Dashes are 0.09 units long.
DIMCEN = 0.5. Dashes are 0.5 units long.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 84
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 85
Summary-Dimensioning Commands
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 86
Dimensioning Commands
DLI DIMLINEAR
DAL DIMALIGNED
DAN DIMANGULAR
DBA DIMBASELINE
DCE DIMCENTER
DCO DIMCONTINUE
DED DIMEDIT
DRA DIMRADIUS
DDI DIMDIAMETER
DOR DIMORDINATE
DOV DIMOVERRIDE
DST DIMSTYLE
LE LEADER
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 87
Using the Dimensioning Mode
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 88
Using the Dimensioning Mode
Entering DIM or DIM1 enters the “dimensioning mode”
You can enter as many dimensions as
desired in this mode
Enter E or EXIT or press the [Esc] key to exit
this mode
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 89
Transparent Dimensioning
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 90
Transparent Commands
Dimensioning variables can be entered transparently while in another command.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 91
Transparent Commands
At most dimensioning prompts, the variable name can be entered without the DIM prefix.
Horizontal
Vertical
Aligned
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 92
Transparent Commands
DIM: prompt
ALIGNED
ANGULAR
BASELINE
CONTINUE
DIAMETER
HOMETEXT
HORIZONTAL
LEADER
LEADER
NEWTEXT
Command: prompt
DIMALIGNED
DIMANGULAR
DIMCENTER
DIMCONTINUE
DIMDIAMETER
DIMEDIT Home
DIMLINEAR
Horizontal
DIMEDIT Text
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 93
Transparent Commands
DIM: prompt
OBLIQUE
ORDINATE
OVERRIDE
RADIUS
RESTORE
ROTATED
SAVE
Command: prompt
DIMEDIT Oblique
DIMORDINATE
DIMOVERRIDE
DIMRADIUS
DIMSTYLE Restore
DIMLINEAR
DIMSTYLE Save
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 94
Transparent Commands
DIM: prompt
STATUS
TEDIT
TROTATE
UPDATE
VARIABLES
VERTICAL
Command: prompt
DIMSTYLE Status
DIMTEDIT
DIMEDIT Rotate
DIMSTYLE Apply
DIMSTYLE Variables
DIMLINEAR Vertical
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 95
Transparent Commands
Exception: DIMCEN
Is interpreted as CEN object snap override if
not preceded by DIM.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 96
Drawing Leader Lines
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 97
Drawing Leader Lines
The DIMDIAMETER and DIMRADIUS commands automatically place leaders on the drawing.
The LEADER command allows you to begin and end a leader line where you desire.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 98
Drawing Leader Lines
Leader lines are ideal for:
Adding specific notes to a drawing.
Situations where a leader line must be
staggered to go around other drawing
features.
Where a double leader line is required.
Where custom leaders are needed.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 99
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 100
LEADER Command
The leader line characteristics, such as arrowhead size and text positioning are controlled by the dimension variable settings.
Other features are controlled by options within the LEADER command.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 101
LEADER Command
The LEADER command is accessed by:
Picking the Leader button in the Dimension
Toolbar.
OR
Picking Leader in the Dimension pull-down
menu.
OR
Typing LE or LEADER at the Command:
prompt.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 102
LEADER Command
The LEADER command prompts look like the LINE command prompts.
Pick the starting and ending points of the
leader.
The Annotation option is the default.
Press [Enter] and type in the desired note.
The Mtext prompt appears.
Type as many lines of text as desired.
Terminate with the [Enter] key.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 103
LEADER Command Options
The Annotation sub-options
Tolerance.
Copy.
Block.
None.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 104
LEADER Command Options
The Annotation sub-options
Tolerance
Allows creation of the feature control frame
Discussed in Chapter 21 of text.
Copy
Copies text, mtext, feature control frame or block,
and connects the new object to the leader being
created.
Refer to Figure 18-43B.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 105
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 106
LEADER Command Options
The Annotation sub-options
Block
Inserts a specified block at the end of the leader.
None
This option ends the leader with no annotations of
any kind.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 107
LEADER Command Format Options
The LEADER command allows you to modify the way a leader line is presented.
Accomplished by accessing the Settings
option.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 108
LEADER Command Format Options
The Settings Options:
Spline.
Straight.
Arrow.
None.
Exit.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 116
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 117
The UNDO Option
The Undo option removes the last leader segment that was drawn.
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EDT 310 - Chapter 18 - Basic Dimensioning Practices 118
Using Multiple Leaders
Multiple Leaders can be drawn in AutoCAD.
Use the LEADER command to place the first
leader and note.
Enter the LEADER command again and pick
the beginning of the previous leader shoulder
as the second point.
Use the Annotation None option to terminate
the command.