Basic Editing Commands
Sacramento City College
EDT 310
EDT 310 - Basic Editing Commands
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Objectives
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Objectives-Learn to Use
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Move
Copy
Mirror
Break
Rotate
Scale
Fillet
Chamfer
Stretch
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Arrays
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Rectangular
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Polar
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Positive
Negative
Non rotated
Rotated
Offset
Trim
Extend
DText
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“Modify” Commands Location
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Toolbar
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Modify
Pull-down Menu
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Modify
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The MOVE Command
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The MOVE Command
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Use MOVE to change the location of objects.
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The MOVE Command
u
Access the MOVE command by:
u
Command Alias: M
u
u
Toolbar: Modify
u
u
or
or
Pull-down menu: Modify
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The MOVE Command Sequence
u
Sequence of command:
u
MOVE
u
u
u
u
Select objects: 1 found
Select objects:
Specify base point or displacement:
Specify second point of displacement or <use first point
as displacement>:
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The MOVE Command
Select all objects desired to be moved.
Select the basepoint with the mouse and left
mouse button.
Think of the basepoint as the “handle”.
Select the second point of displacement with the
mouse and left mouse button.
The object will move after selection of the
second point of displacement.
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The MOVE Command
Don’t forget to terminate your selection with
the [Enter] key !
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COPY Command
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The COPY Command
Use COPY to make one or more copies of an
existing drawing object.
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The COPY Command
Access the COPY command by:
Command Alias: CO
or
Toolbar: Modify
or
Pull-down menu: Modify
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The COPY Command
Select all objects desired to be copied
Select the basepoint with the mouse and left
mouse button.
Think of the basepoint as the “handle”
Select the second point of displacement with the
mouse and left mouse button.
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The COPY Command
The object will copy after selection of the second
point of displacement.
Don’t forget to terminate your selection with the
[Enter] key!
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The COPY Command Sequence
Command Sequence:
Command: COPY
Select objects: 1 found
Select objects:
use Enter to stop selecting objects (!)
Specify base point or displacement, or [Multiple]:
Specify second point of displacement or <use first
point as displacement>:
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The MIRROR Command
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The MIRROR Command
Objects can be mirrored with this command.
You mirror objects by
first selecting them and
then selecting a line about which to mirror them.
The “mirror line” is a hinge about which the
objects are mirrored or reflected.
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The MIRROR Command
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The MIRROR Command
Access the MIRROR command by:
Command Alias: MI
or
Toolbar: Modify
or
Pull-down menu: Modify
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The MIRROR Command
Select objects with left mouse button.
Terminate object selection with Enter key
Select the first point of mirror line:
Indicate the first point with mouse.
Select the second point of mirror line:
Indicate the second point with mouse.
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The MIRROR Command Sequence
Delete old objects <N> ?
Type “Y” to delete old objects
“N” is the default (which does NOT delete old objects)
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The MIRROR Command Sequence
Command: MIRROR
Select objects: 1 found
Select objects: 1 found, 2 total
Select objects: Terminate selection with Enter
Specify first point of mirror line:
Specify second point of mirror line:
Delete source objects? [Yes/No] <N>:
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AutoCAD “Default” Choices
Default choices are always shown in
“chevrons”
Example: < N >
Press [Enter] to select the default.
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The ROTATE Command
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The ROTATE Command
Design changes often require that an object,
feature, or view be rotated.
Use the ROTATE command to change the
orientation of an object or group of objects.
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The ROTATE Command
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The ROTATE Command
Access the ROTATE command by:
Command Alias: RO
or
Toolbar: Modify
or
Pull-down menu: Modify
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The ROTATE Command
Select a base point with a pick.
Enter a rotation angle with mouse.
A negative rotation angle revolves the object clockwise.
A positive rotation angle revolves the object
counterclockwise.
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The ROTATE Command Sequence
Command: ROTATE
Current positive angle in UCS:
ANGDIR=counterclockwise ANGBASE=0
Select objects: 1 found
Select objects: 1 found, 2 total
Select objects:
Specify base point:
Specify rotation angle or [Reference]:
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The ROTATE Command Sequence
Rotation
Counterclockwise = positive rotation
Clockwise = negative rotation
By default, AutoCAD angles start at 3 o'clock
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The SCALE Command
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The SCALE Command
The SCALE command lets you change the size of
an object
or
a complete drawing.
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The SCALE Command
The SCALE command
enlarges or reduces the entire object proportionally.
If associative dimensioning is used, the
dimensions also change to reflect the new size.
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The SCALE Command – Scale Factor
Specifying the Scale Factor is the default option.
Enter a number to indicate the amount of enlargement
or reduction.
To double the scale, type “2”
To half the scale, type “0.5”
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The SCALE Command Sequence
Access the SCALE command by:
Command Alias: SC
or
Toolbar: Modify
or
Pull-down menu: Modify
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The SCALE Command Sequence
Command: “SC” or “SCALE”
Select objects
Terminate object selection with the [Enter] key.
Select a Base point:
Enter the <Scale factor>/Reference:
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SCALE Command Sequence-Reference
Command: SCALE
Select objects: 1 found
Select objects:
Terminate object selection with [ENTER]
Specify base point:
Specify scale factor or [Reference]: R
Specify reference length <1>: 3
Specify new length: 6
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Reference Option
An object can also be scaled by specifying an
new size in relation to an existing dimension.
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Reference Option
The Scale command changes all dimensions of
an object proportionately.
If you want to change only the width or length
of an object, use the STRETCH or LENGTHEN
command instead.
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The BREAK Command
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The BREAK Command
A “gap” can be inserted in any object with
this command.
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The BREAK Command Sequence
Access the BREAK command by:
Command Alias: BR
or
Toolbar: Modify
or
Pull-down menu: Modify
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Break Command Sequence
Command: BREAK
Select objects:
Terminate object selection with the [ENTER] key.
Enter second point (or F for first point)
Typing “F” allows you to re-specify the first point
A break is inserted in the object.
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The FILLET Command
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FILLET Command
Definition: In mechanical drafting, an inside
rounded corner is called a fillet.
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FILLET Command
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FILLET Command
The FILLET command draws a rounded corner
between
intersecting lines
OR
non-intersecting lines.
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FILLET Command
Fillets are sized by radius
The default radius is 0.5
A new radius is specified first by typing “R” on the
prompt line for the Radius option
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FILLET Command
Access the FILLET command by:
Command Alias: F
or
Toolbar: Modify
or
Pull-down menu: Modify
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FILLET Command
Command: “F” or “FILLET”
(TRIM mode) Current fillet radius = 0.5
Polyline/Radius/Trim/(Select first object):
Enter fillet radius:
(enter the fillet radius and press [Enter]
or
press [Enter] to accept the current value.
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FILLET Command
Two settings control the final appearance of
lines after using the FILLET command.
The TRIMMODE system variable and
Trim option
The object segments that extend beyond the
fillet radius point lines may or may not be
trimmed.
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FILLET Command
When Trim mode is OFF,
the filleted objects are NOT CHANGED after the
fillet is inserted.
(The corners remain).
When Trim Mode is ON
the corners are automatically extended to form a
smooth fillet.
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FILLET Command
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The CHAMFER Command
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Chamfer
Definition: A chamfer is a small angled
surface used to relieve a sharp corner.
AutoCAD defines a chamfer as any angled
corner on the drawing.
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Chamfer
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Chamfer
The size of a chamfer is determined by its
distances from the corners.
Distances from corner can be
Equal
Not equal
A 45o chamfer
is the same distance from the corner in each
direction.
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Chamfer Command Sequence
Access the CHAMFER command by:
Command Alias: CHA
or
Toolbar: Modify
or
Pull-down menu: Modify
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Chamfer Command Sequence
Command: CHAMFER
(TRIM mode) Current chamfer
Dist1 = 0.5000
Dist2 = 0.5000
Select first line or
[Polyline/Distance/Angle/Trim/Method]
Select second line:
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CHAMFER Command
Select first line or [Polyline/Distance/Angle/Trim
Method]
You must first set the Options for the Chamfer
command.
Select chamfer
Select any one of the following modifying options
by typing the capitalized letter
P – Polyline
D – Distance
A – Angle
T – Trim method
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CHAMFER Command Options
Polyline - Use this option if you want to chamfer
all edges on a Polyline
Distance - lets you set the chamfer distance for
each line from the corner
Angle uses a chamfer distance on the first line
applies a chamfer angle to determine the second line
chamfer.
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Chamfer Command Options
Trim - Enter this to set the Trim mode.
If trim is on,
the selected lines are trimmed or extended as required
from the corner before creating the chamfer line.
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The DTEXT Command
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The DTEXT Command
DTEXT is the dynamic text command.
Causes text to be displayed on the screen as you type.
Creates single-line text
Each line of text is a single object
Most useful for text items that require only one
line of text
This text command is the MOST COMMONLY
USED command.
NOT MTEXT!
We will use DTEXT almost exclusively.
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The DTEXT Command Sequence
Command: DTEXT
Current text style: "Standard" Text height: 0.2000
Specify start point of text or [Justify/Style]:
Specify height <0.2000>:
Specify rotation angle of text <0>:
Enter text: this is text
Enter text: this is text
Enter text: hit the [Enter] key on a blank line to exit
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The MTEXT Command
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The MTEXT Command
MTEXT (MT)
Creates multiple line text
Think “Wordprocessor”
Use for Paragraph of text.
Use for mixed types of text
Bold
Underline
Italics
Varied fonts
MTEXT will be covered later in the course.
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The ARRAY Command
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The ARRAY Command
Some designs require a rectangular or circular
pattern of the same object or objects.
Example:
Suppose your drawing calls for 20 desks arranged
in 5 rows.
You could draw the desk once and copy it 19 times or
You could use the ARRAY command.
Faster and easier
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The ARRAY Command
A Rectangular Array creates rows and columns
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The ARRAY Command
A Polar Array constructs a circular arrangement
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Rectangular Arrays
Access the ARRAY Command by:
Command Alias: AR
Or
Toolbar: Modify
Or
Pull-down Menu: Modify
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The ARRAY Command
A Polar Array constructs a circular arrangement
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Polar Arrays
Command: ARRAY
Select objects: (select the objects)
Select objects:
[Enter] to terminate selection
Rectangular or POlar array (R/P)<current>:
enter R or PO
Base/<Specify center point of array>: (pick the
center point of the array)
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The STRETCH Command
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The STRETCH Command
The SCALE command
changes the length and width of an object
proportionately.
The STRETCH command
changes only one dimension of an object.
In mechanical drafting, it is common to increase the
length of a part while leaving the diameter or width the
same.
In architectural design, room sizes may be stretched to
increase the square footage.
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The STRETCH Command
When using STRETCH, you must select objects
by:
A crossing window
A crossing polygon
If you do not use a Crossing Window or a
Crossing Polygon, STRETCH will not work!
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The STRETCH Command
A crossing window
Is drawn right-to-left
Is green shaded
Is dashed border
A window
Is drawn left-to-right
Is blue shaded
Is solid border
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The STRETCH Command
To access the STRETCH command:
Command Alias: S
Or
Toolbar: Modify
Or
Pull-down Menu: Modify
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The CROSSING WINDOW
To use the Crossing window
Type “C” at the Select object: prompt
or
Drag your selection window from right to left.
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The STRETCH Command
The placement of the edge of the Crossing
Window is important!
The lines crossed by the edge of the Crossing
Window will be stretched.
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The STRETCH Command
Select only the portion of the object to be
stretched.
If you select the entire object, STRETCH acts like MOVE.
Pick a basepoint.
This is the location from which the object will be
stretched.
Pick a new position for the base point.
As you move the screen cursor, the object is
stretched or compressed.
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STRETCH Command Sequence
Command: stretch
Select objects to stretch by crossing-window or
crossing-polygon...
Select objects: use crossing window (!)
Specify opposite corner: 1 found
Select objects:
Terminate object selection with [ENTER] key
Specify base point or displacement:
Specify second point of displacement:
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1
2
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1
2
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The OFFSET Command
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The OFFSET Command
The OFFSET command is used to draw
Concentric circles
Concentric arcs
Concentric curves
Concentric Polylines.
Parallel lines.
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The OFFSET Command
Access the OFFSET command by:
Command Alias: O
OR
Toolbar: Modify
OR
Pull-down Menu: Modify
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The OFFSET Command
Select Object
Type an OFFSET distance
Pick side that offset object is to be placed
or
pick a point for the parallel object to be drawn
through.
The last offset distance entered is shown in
brackets in the Command area.
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The OFFSET Command
Think
“This object”
On
“This side”
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The TRIM Command
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The TRIM Command
The TRIM command cuts:
lines
circles
arcs
ellipses
splines
xlines
Rays
At a specified Cutting Edge
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The TRIM Command
Access the TRIM command by:
Command Alias: TR
or
Toolbar: Modify
or
Pull-down menu: Modify
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The TRIM Command
TRIM requires a “cutting edge”.
The cutting edge can be:
a line
an arc
text
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The TRIM Command
When you TRIM objects,
the first prompt asks you for a cutting edge.
If you press Enter, AutoCAD will specify all objects
as potential cutting edges.
Then, select the part of the object that you want
to trim and AutoCAD automatically trims it at the
closest possible cutting edge.
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The TRIM Command
1. Enter TRIM command
2. At the Select cutting edges … Select objects or
<select all>: prompt, press Enter.
3. Select the object(s) to trim.
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The TRIM Command
An implied intersection is the point where two
or more objects would meet if they were
extended.
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The TRIM Command
AutoCAD can trim objects to an implied
intersection, even if the objects do not
intersect.
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The TRIM Command
EXTEND must be “ON”
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The TRIM Command Sequence
Command: Trim
Current settings: Projection=UCS Edge=Extend
Select cutting edges ...
Select objects: 1 found
Select objects:
Terminate object selection with [ENTER] key.
Select object to trim or [Project/Edge/Undo]:
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The TRIM Command Options
Command: TRIM
Current settings: Projection=UCS Edge=Extend
Select cutting edges ...
Select objects: 1 found
Select objects:
Select object to trim or [Project/Edge/Undo]: e
Enter an implied edge extension mode [Extend/No extend] <Extend>:
Select object to trim or [Project/Edge/Undo]:
Select object to trim or [Project/Edge/Undo]:
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The EXTEND Command
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The EXTEND Command
The EXTEND command is used to lengthen
existing
lines
arcs
rays
open polylines
This command is the opposite of the TRIM
command.
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The EXTEND Command
To use the EXTEND command:
Command Alias: EX
OR
Toolbar: Modify
OR
Pull-down Menu: Modify
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The EXTEND Command
The command format is similar to TRIM.
You are asked to select boundary edges, as
opposed to cutting edges.
Boundary edges
are objects such as
Lines
Arcs
Text
to which the selected objects are extended.
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The EXTEND Command
You can also EXTEND an object to an implied
intersection.
Select the Edge option.
When you enter the Edge option, the choices are
Extend and No extend.
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The EXTEND Command
When Extend is active
the boundary edge object is checked to see if it
intersects when extended.
If an intersection does exist, the implied
intersection point can be used as the boundary for
the object to be extended.
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The EXTEND Command
Command: EX or EXTEND
Current settings: Project = UCS. Edge=None
Select boundary edges…
Select objects: (pick the boundary edge)
Select objects [Enter]
Select object to extend or [Project/Edge/Undo]: E
Enter implied edge extension or mode [Extend/No
extend] <No extend>: E
Select object to extend or [Project/Edge/Undo]:
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