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SubjectPaid lesson

ORTHOGRAPHIC DRAWING

ClassNotes Team 4 MIN READUPDATED 5 JUL 2026

Basic Technology JSS3 First Term

WEEK NINE AND TEN

ORTHOGRAPHIC DRAWING

PERFORMANCE OBJECTIVE

By the end of the lesson, the students should be able to learn:

  1. ORTHOGRAPHIC DRAWING
  2. METHODS OF PROJECTIONS
  3. ANGLES OF PROJECTION
  4. DIMENSIONING

CONTENT

ORTHOGRAPHIC DRAWING

The draughtsman or engineer uses two basic methods to represent an object on paper, board, or similar surfaces. The two basic methods are:

  • Orthographic projection
  • Pictorial projection

Orthographic projection is used to show at least three views. The three views usually shown in orthographic projection are: front view (elevation), side view (either right side or left side), and plan (top view). Orthographic drawing is the method of producing the drawing of an object so it can be fabricated accurately.

CHARACTERISTICS OF…