INTRODUCTION TO TECHNICAL DRAWING

15.1.1 INTRODUCTION TO TECHNICAL DRAWING THEORY

Objectives

By the end of the sub-module unit, the trainee should be able to: identify drawing instruments use drawing instruments care and maintenance of drawing instruments identify and generate paper sizes identify different types of lines and their application layout of drawing paper print numbers and alphabetic on a drawing

Key points

: Drawing instruments - T-square, drawing board - Set squares (300 – 600, 450) - Protractors, dividers, pair of compasses - Rulers, scale rules, erasers Correct use of the instruments Correct care and maintenance of the instruments Paper sizes - Ao, - A1, - A2, - A3, - A4 - how to generate the paper sizes - Use of ammonia process - Photocopying Types of lines - Dark (Bold) - Continuous lines - Light/thin continuous lines - Short dashes - Long dashes followed by short dashes Layout of drawing paper - Title block - Notes to drawings Printing numbers and letters - title blocks - notes to drawings

Competencies

Ability to: Select good quality drafting equipment Drawing using drawing equipment Care and maintain equipment Generate different paper sizes