Drawing
Problems
-
Chapter
1
Features
of
the
textbook
iv
AutoCAD and Its Applications—Basics
Copyright Goodheart-Willcox Co., Inc.
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Copyright Goodheart-Willcox Co., Inc.
CHAPTER CHAPTER
Modifying Objects
Learning Objectives
After completing this chapter, you will be able to:
✓ Use the FILLET command to draw fi llets, rounds, and other radii.
✓ Place chamfers and angled corners with the CHAMFER command.
✓ Form a spline using the BLEND command.
✓ Separate objects using the BREAK command and combine objects using the JOIN
command.
✓ Use the TRIM and EXTEND commands to edit objects.
✓ Change objects using the STRETCH and LENGTHEN commands.
✓ Edit the size of objects using the SCALE command.
✓ Use the EXPLODE command.
AutoCAD includes many editing commands and options to complete common
drafting tasks, improve efficiency, and modify a drawing. This chapter explains
methods of using basic editing commands to change existing objects by changing or
adding geometry. The editing method used in this chapter is to access a command
such as STRETCH and then follow the prompts to complete the operation. Another
technique, presented in Chapter 13, is to select objects fi rst using the crosshairs, then
access the editing command, and fi nally complete the operation.
Using the FILLET Command Using the FILLET Command
Design and drafting terminology refers to a rounded interior corner as a fi llet and
a rounded exterior corner as a round. AutoCAD refers to all rounded corners as fi llets.
The FILLET command draws a rounded corner between intersecting or noninter-
secting lines, arcs, circles, ellipses, polylines, splines, xlines, and rays. See Figure 11-1.
Setting the Fillet Ra adiusus
Access the FILLET comman nd an nd then use the Radius option to specify the
fillett radius.. The radius determines the size of a fillet and must be set before
you select objects.. AuttoCAD stores the radius as the new default, allowing you to
place addiitional filllets of the same siz ze. Once you define the radius, select the first
object an nd then ho over the pick box over the second object to preview the operation.
fillet: A rounded
interior corner used
to relieve stress or
ease the contour of
inside corners.
round: A rounded
exterior corner used
to remove sharp
edges or ease the
contour of exterior
corners.
FILLET
Ribbon
Home
Modify
Fillet
Type
FILLET
ROUND
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Copyright Goodheart-Willcox Co ., I n c.
S et S ti n g t h e F i ll et R di
A c c ess t h e FILLE T c o mm a d a d t h e n
f ill e r a di u s Th e r a di u s d e t e rmin es t h e s i
yo u se l e c t ob je c t s Au o CAD st o r es t h e r a di
pl a c e a d d t i o n a l f i l et s o f t h e s a m e s i e . O n c
obje c t a d t h e n h ve r t h e pi c k bo x ov e r t h e s
502
AutoCAD and Its Applications—Basics
Goodheart-Willcox Co., Inc.
Dm
i
e
n
schange
i
o
n
L
a
y
e
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O
v
e
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rd
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Dimen
s
ion L
a
yer Overridelayer
Though you can always the layer assigned to an object, you generally make
the appropriate layer current before drawing. For example, set a
Dimension
current
before dimensioning. An alternative available when using the
DIM
command is to assign
a layer other than the current layer to new dimension objects. This is most practical if all
of the dimensions created with the
DIM
command are assigned to one layer.
An easy way to override the layer assigned to dimension objects is to pick the layer
name from the
Dim Layer Override
drop-down list in the
Dimensions
panel of the
Annotate
ribbon tab. See
F
igure 17-22
. Use the vertical scroll bar to move up and down through a
long list. You can also set the dimension layer override using the
Layer
option of the
DIM
command. Enter the layer name or select an object assigned to the layer to use as the over-
ride layer. The
DIMLAYER
system variable stores the dimension layer override setting.
NOTE NOTE
You can use the
Layer
option of the
DIM
command to enter a name of a new layer that
does not currently exist to use for the dimension layer override. However, it is better
practice to select an existing layer with appropriate properties.Copyright
NEW
AutoCAD
F
igure 17-21.
Options for
handling
overlapping
dimensions while
using the
DIM
command.
.808
.808
.218
.218
.590
.218
.218
.808
.218
Linear .218 dimension addeddimension at same location as existing
Existing linear
.808 dimension
Select an
option
Adding an Overlapping Dimension
Move away
(Baseline Dimensioning)
Break
(Chain
Dimensioning)up
None
Replace
Lear ning Objectives
identify key items you will
learn in the chapter.
New Feature Graphics
identify new and updated
features for AutoCAD 2016.
Command Entry
Graphics show ribbon,
Application
Menu, and
keyboard entry options.
Illustrations, including
line art illustrations,
AutoCAD “screen shots,”
and illustrated tables,
make learning easy.