PRINCIPLES OF DRAFTING AND SHOP DRAWINGS - OD1641 - LESSON 1/TASK 2
Step 4. Define the intersection of arc (X-2) and line X-B as point 3 (figure 34,
view B, on the previous page).
Step 5.
Bisect line 3-B and draw the bisect line so that it intersects an
extension of the line X-O-Y. Define this intersection as point 5 (view C).
Step 6.
Define the intersection of the bisect line and line O-B as point 4 (view
C).
Step 7.
Using point 5 as center, draw an arc of radius 5-X as shown in view C.
Also draw an arc of radius 4-B as shown in view C. These two arcs will generate
half of the ellipse. Draw the other half by symmetry (view D).
4.
Conclusion
In this task, we covered drafting instruments and the fundamentals of geometric
construction.
In the next task, we will discuss the theory and fundamentals of
pictorial drawings: oblique and isometric projection.
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