PRIN. OF DRAFTING AND SHOP DRAWINGS - OD1641 - LESSON 1/TASK 3
THE BASIC REFERENCE SYSTEM
FOR ISOMETRIC DRAWINGS.
Normally, an isometric drawing is positioned so that the front, top, and right side
views appear, as shown in figure 37 (on the following page). This may be varied
according to the position that the draftsman feels best shows the object.
Dimensional values are transferable from orthographic views only to the axis, or
lines parallel to the axis, of isometric drawings. Angles and inclined dimensional
values are not directly transferable and require special supplementary layouts
which will be explained later (page 50, paragraph 2b) in this task.
Isometric drawings do not normally include hidden lines, although hidden lines may
be drawn if special emphasis of a hidden surface is required.