Chapter 4 CAD Commands and Functions 111
Select fi rst object or [Undo/Polyline/Radius/Trim/
Multiple]:
(select one of the two objects between
which the fi llet or round is to be placed) fi
Select second object or shift-select to apply corner:
(select the second of the two objects between which
the fillet or round is to be placed) fi
Command:
Chamfer
The
Chamfer
command is very similar to the
r
Fillet
command. However, instead of a curve, a
straight line is placed between the chamfered
lines. Just as with the
Fillet
command, the origi-
nal lines are trimmed to meet the straight line
(chamfer). Depending on the CAD program,
this command may require that the two objects
to be chamfered are lines, not arc segments.
AutoCAD Example:
Command: chamfer↵ r r
(TRIM mode) Current chamfer Dist1 = 0.5000,
Dist2 = 0.5000
Select fi rst line or [Undo/Polyline/Distance/Angle/
Trim/mEthod/Multiple]: distance↵
Specify fi rst chamfer distance 0.5000: .25↵
Specify second chamfer distance 0.2500: ↵
Select fi rst line or [Undo/Polyline/Distance/Angle/
Trim/mEthod/Multiple]:
(pick the first line to fi
chamfer)
Select second line or shift-select to apply corner:
(pick
the second line to chamfer)
Command:
Trim
The
Trim
command is used to shorten a
line, arc, or other object to its intersection with
an existing object. The object that establishes
the edge you are trimming to is called a
cutting edge. The cutting edge is defined by
one or more objects in the drawing. Some
CAD programs allow you to trim objects
without specifying a cutting edge. In this
case, the nearest intersection is used for the
trim operation.
Most CAD programs place limitations
on which types of objects can be trimmed.
In addition, there are usually only certain
types of objects that can be used as boundary
edges.
AutoCAD Example:
Command: trim↵
Current settings: Projection=UCS, Edge=Extend
Select cutting edges…
Select objects or select all:
(pick a cutting edge)
1 found
Select objects: ↵
Select object to trim or shift-select to extend or
[Fence/Crossing/Project/Edge/eRase/Undo]:
(select the object to trim)
Select object to trim or shift-select to extend or
[Fence/Crossing/Project/Edge/eRase/Undo]: ↵
Command:
Extend
Extending an object lengthens the object to
end precisely at an edge called a boundary edge.
The
Extend
command sequence is similar to the
Trim
command sequence. The boundary edge is
defi by one or more objects in the drawing. fined
There are usually limitations on which types
of objects can be extended or used as boundary
edges.
Figure 4-14. Fillets and rounds on a drawing.
Fillet
Round
Fillet