Figure 1-15.Three orthographic views to be drawn isometrically.
(fig. 1-15). Now, make three isometric sketches
There is more information on drawing sketches in
Blueprint Reading and Sketching, NAVEDTRA
Q5. An isometric drawing is designed to show what
type of picture?
Q6. Horizontal lines on an isometric drawing are
projected at what angles?
Q7. It is more difficult to dimension an isometric
drawing than an orthographic drawingfor what
LEARNING OBJECTIVE: Relate to the
arrangement and purpose of specifications and
their relationship with plans and drawings.
Although the plans you will be working from
usually have sufficient detail, you will need additional
information regarding materials and methods of
installation. This information is located in the
appropriate specifications. Plans and specifications go
together to provide visual and written information
about a project required by you, as the constructor,
installer, or maintainer, to produce the best quality
There are several types of specifications
(SPECS), but you will work primarily with
project guide, federal, military, and NAVFAC
Project guide specifications usually begin with
Division 1, the GENERAL REQUIREMENTS
for the structure. They state the type of founda-
tion, the character of load-bearing members
(wood frame, steel frame, concrete), the type or
types of doors and windows, the types of
mechanical and electrical installations, and the
principal function of the building. Next comes the
SPECIFIC CONDITIONS that are carried out by the
constructors. The conditions are grouped in divisions
under headings applying to each major phase of
construction as follows:
SITE WORK. Includes work performed on
the site, such as grading, excavation, compaction,
drainage, site utilities, and paving.
CONCRETE. Includes precast and cast-in-
place concrete, formwork, and concrete reinforcing.
MASONRY. Includes concrete masonry
units, brick, stone, and mortar.