LESSON 1

DRAFTING AND SHOP DRAWING FUNDAMENTALS

TASK 2.

Describe drafting

instruments

and

the

fundamentals

of

geometric

construction.

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

In task one of this subcourse, we covered orthographic projection and freehand

drafting. In this task, we will cover drafting instruments and the fundamentals of

2.

Drafting Instruments

In the following paragraphs, we will cover some of the drafting instruments that

may be encountered and used; however, we will not cover such common instruments as

pencils and erasers.

a. * Scales*. Scales are used for linear measuring. The scale most commonly used by

a draftsman is one with its inches graduated into sixteen divisions, with each

division measuring one-sixteenth of an inch.

Figure 16 (on the following page)

shows part of a "16 to the inch" scale, together with some sample measurements.

Unlike a real scale, the scale in figure 16 has the first inch completely labeled

to help you become familiar with the different fractional values.

Measurements

more