110 Section 1 Introduction to Drafting
AutoCAD Example:
Command: mirror↵ r r
Select objects:
(select the objects to mirror)
Select objects: ↵
Specify fi rst point of mirror line:
(enter coordinates or
pick an endpoint of the line about which to reflect fl
the objects)
Specify second point of mirror line:
(enter coordinates
or pick the second endpoint of the line about which
to refl the objects) flect
Erase source objects? [Yes/No] N: n↵
Command:
Rotate
The
Rotate
command is used to alter the
orientation of objects on the drawing. Typically,
you must specify a center for the rotation. This
command is perhaps one of the most used
editing commands.
AutoCAD Example:
Command: rotate↵
Current positive angle in UCS:
ANGDIR=counterclockwise ANGBASE=0
Select objects:
(pick the objects to rotate)
Select objects: ↵
Specify base point:
(enter coordinates or pick a point
about which to rotate the objects)
Specify rotation angle or [Copy/Reference]: 0:
(enter an angle or drag the cursor to the desired
rotation)
Command:
Scale
The size of existing objects can be changed
using the
Scale
command. When using the
Scale
command, most CAD programs require you to
specify a base point for the operation. This point
is generally on the object, often the center of the
object or a reference corner.
In CAD programs with parametric model-
ing capability, you can change the base size
parameter, or any other parameter, of the object
without using the
Scale
command. For example,
you can scale a ∅5 circle up by 50% by simply
changing its diameter to 7.5 without using the
Scale
command.
AutoCAD Example:
Command: scale↵
Select objects:
(pick the objects to scale)
Select objects: ↵
Specify base point:
(enter coordinates or select a
point about which the objects will be scaled)
Specify scale factor or [Copy/Reference] 1.0000:
1.5↵
Command:
Fillet
A fillet fi is a smoothly fitted t internal arc of fi
a specified radius between two lines, arcs, or fi
circles. A round is just like a fillet, except it is fi
an exterior arc, Figure 4-14. Most manufactured
parts, including those for architectural applica-
tions, have some fillets or rounds. The fi
Fillet
command is used to place fillets and rounds fi
onto the drawing. After drawing the curve, the
command trims the original objects to perfectly
meet the curve.
AutoCAD Example:
Command: fi llet↵ fi
Current settings: Mode = TRIM, Radius = 0.2500
Select fi rst object or [Undo/Polyline/Radius/Trim/
Multiple]: radius↵
Specify fi llet radius 0.2500: .50↵
Figure 4-13. The hole pattern shown was created
using mirror operations. The pattern was fi rst mirrored
vertically, then the original and the mirrored copy were
mirrored horizontally. The mirrored copies are shown
in color.
Mirror line
Mirror line
Step 1 Completed Pattern
Step 2 Step 3