PRIN. OF DRAFTING AND SHOP DRAWINGS - OD1641 - LESSON 1/TASK 1
LESSON 1
DRAFTING AND SHOP DRAWING FUNDAMENTALS
TASK 1.
Describe orthographic projection theory and freehand drafting.
CONDITIONS
Within a self-study environment and given the subcourse text, without assistance.
STANDARDS
Within one hour
REFERENCES
No supplementary references are needed for this task.
1.
Introduction
Most work done in a metalworking repair shop is detailed through the use of
blueprints and shop drawings. In order to interpret these drawings into workable
plans, the repair shop technician must be familiar with the fundamentals of
drafting and shop drawings.
That is the purpose of this subcourse, to introduce the student to the fundamentals
of drafting and shop drawings. Task one of this subcourse will cover the theory of
orthographic projection and freehand drafting.
2.
Orthographic Projection
Accurate orthographic drawings are the foundation of all construction drawings.
They furnish complete information for construction and repair, as well as present
an object in its true proportions as to shape and size. Third-angle orthographic
projection is the standard for all mechanical drawings. These drawings have very
little pictorial value but are so superior to all
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