204 Section 2 Drafting Techniques and Skills
Figure 6-55. Using the Center, Start, End and Continue options of the Arc command to connect parallel lines
with reversing arcs of equal radii. A—The parallel lines are given. B—Line BC is drawn and divided into four
equal parts. C—Perpendiculars are drawn to locate the center point of the fi rst arc. D—The two tangent arcs are
drawn. The fi rst arc is drawn using the Center, Start, End option. The second arc is drawn using the Continue
option to locate a tangent arc from the endpoint of the fi rst arc.
A B
C D
Arc
center
point
Second arc
Endpoint
of arc
First arc
Endpoint
of arc
(third point)
Center point
of arc
(first point)
Perpendiculars
A B
C D
C D
A B
Start point
of arc
(second point)
C D
A B
C D
A B
3. Draw a perpendicular extending from
Line BC. Enter the
Line
command
and use the Perpendicular object
snap to select a point along the line.
Pick a second point to complete the
line. Enter the
Move
command and
reposition the line so that the endpoint
intersects the uppermost division
point on Line BC. Use object snaps as
needed. See Figure 6-55C.
4. Draw a perpendicular extending from
Point C. The intersection of the two
perpendiculars is the center point for
drawing the first arc. fi
5. Enter the
Arc
command and enter the
Center
option. Using the Intersection
r
object snap, select the arc center point.
Specify the start point of the arc (the sec-
ond point) by selecting Point C. Specify
the endpoint of the arc by selecting the
middle division point on Line BC. This
draws the fi rst tangent arc, fi Figure 6-55D.
6. Enter the
Arc
command and enter the
Continue
option. This option allows you
to continue drawing from the previously
drawn arc. The new arc you draw is tan-
gent to the previously drawn arc. Specify
the endpoint of the new arc by selecting
Point B. This draws the second tangent
arc automatically. Refer to Figure 6-55D.