206 Section 2 Drafting Techniques and Skills
Figure 6-57. Connecting two nonparallel lines with reversing arcs when one radius is given.
A
B
R1
R1
A
C
D
A
B
F
H
B
C
E
G
D
A
B
F
H
C
C
E
K
J
G
D
Connect Two
Given
Nonparallel Lines with
Reversing Arcs with One
Radius Given
CAD
Using a Compass
(Manual Procedure)
1. Two nonparallel lines (Lines AB and CD)
and Radius R
1
are given, Figure 6-57A.
2. Draw a line perpendicular to Line CD
at Point C. Lay off Radius R
1
on this per-
pendicular line. The endpoint is Point E.
With Point E as the center, strike Arc R
1
from Point C, Figure 6-57B.
3. Draw a line perpendicular to Line AB at
Point B. (Note that this line is drawn on
the opposite side of Line AB as Line CD.)
Lay off Line BF equal to Line CE.
4. Draw Line FE and bisect with a perpen-
dicular bisector (Line GH).
5. Extend Line FB to Line GH to intersect
at Point J. Draw Line JE, Figure 6-57C.
Where Line JE intersects Arc R
1
is
Point K.
6. Using Point J as a center and Line JB as
the radius, draw an arc to connect Line
AB to Arc R
1
at Point K. These are the
required arcs. These arcs are tangent to
each other and to the given lines.
Using the Circle and Arc
Commands (CAD Procedure)
1. Two nonparallel lines (Lines AB and CD) and
Radius R
1
R R are given. Refer to Figure 6-57A.
2. Enter the
Offset
command and specify the
offset distance as the length of Radius R
1
.
Offset Lines CD and AB at this distance.
The endpoints of the offset lines locate
Points E and F. Refer to Figure 6-57B.
3. Enter the
Line
command. Draw Lines CE
and BF.
4. Enter the
Line
command. Draw Line FE.
Draw a perpendicular bisector of this line
using the
Circle
and
Line
commands. Refer
to Figure 6-57C. Enter the
Erase
command
and erase the circles when finished. fi
5. Enter the
Extend
command. Select Line
GH as the boundary edge and extend
Line BF to intersect at Point J.
6. Enter the
Line
command. Draw Line JE.
7. Enter the
Circle
command. Draw a circle
with Point E as the center and Radius
R
1
as the radius value. Where this circle
intersects Line JE is Point K.
8. Enter the
Arc
command and enter the
Start,
End, Radius
option to draw the first arc. fi
Specify Point C as the start point and Point K
as the endpoint. Specify the radius value as
Radius R
1
. Enter the
Erase
command and
erase the circle drawn in the previous step.
9. Enter the
Arc
command and enter the
Continue
option to draw the second arc.
Select Point B as the endpoint. The two
arcs are the required arcs.