PRIN. OF DRAFTING AND SHOP DRAWINGS - OD1641 - LESSON 1/TASK 2
Step 1.
Construct an arc of radius R.
Use point 0 as the center (view B).
Step 2.
Define points 3 and 4 where the arc intersects lines 0-1 and 0-2 (view B).
Step 3. Using points 3 and 4 as centers, construct two more arcs of radius R as
shown in view B.
Step 4.
Define the intersection of the two arcs as point 5 (view C).
Step 5.
Construct a line 0-5.
Angle 1-0-5 is equal to angle 5-0-2 (view D).
c. Divide a Line. In the following subparagraphs, we will discuss the procedures
for dividing a line into any number of equal parts and dividing a line into
proportional parts.
(1) Divide a Line into Equal Parts, (figure 25, on the following page).
Let's
assume that we have a line 1-2 (view A).
We have to divide this line into five
equal parts. To divide the line perform the following steps:
Step 1.
Construct a line A-X at any angle to line 1-2 (figure 25, view B).
Step 2.
Mark off five equal spaces along line 1-X and construct a line 2-7 (view
C).
NOTE
Any size space may be used as long as they are all equal in
length.
Step 3.
Draw lines 6-F, 5-E, 4-D, and 3-C parallel to line 2-7 (figure 25, view
D).
32
Previous Page
