Figure 1-15. - Three orthographic views to be drawn isometrically.

(fig. 1-15). Now, make three isometric sketches properly dimensioned.

There is more information on drawing sketches in Blueprint Reading and Sketching, NAVEDTRA 12014.

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 reasons?

SPECIFICATIONS

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 product.

There are several types of specifications (SPECS), but you will work primarily with project guide, federal, military, and NAVFAC specifications.

Project guide specifications usually begin with Division 1, the GENERAL REQUIREMENTS for the structure. They state the type of foundation, 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:

1. - GENERAL REQUIREMENTS.

2. - SITE WORK. Includes work performed on the site, such as grading, excavation, compaction, drainage, site utilities, and paving.

3. - CONCRETE. Includes precast and cast-in- place concrete, formwork, and concrete reinforcing.

4. - MASONRY. Includes concrete masonry units, brick, stone, and mortar.