PRIN. OF DRAFTING AND SHOP DRAWINGS - OD1641 - LESSON 1/TASK 4
LESSON 1
DRAFTING AND SHOP DRAWING FUNDAMENTALS
TASK 4.
Identify shop terms, abbreviations, and dimensioning elements.
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 the previous three tasks, we covered orthographic projection, freehand drafting,
drafting instruments, geometric construction, and pictorial drawings: oblique and
isometric.
In this task, we will identify shop terms, abbreviations, and
dimensioning elements found on shop drawings.
A shop drawing is the drawing one
uses to work from, since it contains all of the information necessary to make an
object.
2.
Dimensions, Tolerances, and Allowances
In the following paragraphs, we will discuss dimensions, tolerances and allowances.
The picture portion of a drawing defines the shape of the object, the dimensions
define the size, and the tolerances define the amount of variance permitted in the
size. All three pieces of information are needed to form a clear, understandable,
manufacturable drawing.
77
Previous Page
