Technical Drawing

15.1.1 INTRODUCTION

15.1.01 MODULE UNIT DESCRIPTION

This module unit involves ability to select, use, care and maintain drawing equipments and materials, construct lines and geometric shapes, use of scales and grids in perspective drawings, draw surface developments and intersection of solids, draw architectural environments, convert pictorial drawings to orthographic views and vice versa, install and use different CAD packages.

15.1.02 PURPOSE

This module unit is intended to equip the trainee with necessary knowledge, skills, values and attitudes that will enable him/her to use drawing equipments and materials for sketching and producing different types of scaled drawings. This module unit intends to enable the trainee to read and interpret simple drawings.

15.1.03 GENERAL OBJECTIVES

At the end of the module unit, the trainee should be able to:

• Understand the principles of Technical Drawing
• Communicate effectively using drawings and symbols.
• Appreciate different types of drawings
• Acquire basic skills necessary for producing working drawings.
• Read and interpret drawings

15.1.04 MODULE UNIT SUMMARY AND TIME ALLOCATION

CODE	SUB-MODULE UNIT	CONTENT	TOTAL
15.1.1	INTRODUCTION TO TECHNICAL DRAWING	Drawing instruments Use of instruments Paper sizes Care and maintenance Paper size Paper layout Printing	3
15.1.2	FREE HAND SKETCHING	Techniques Pictorial sketches	3
15.1.3	POINTS, LINES AND PLANES	Construction of lines in space Lines in orthographic projections True lengths of lines Construction of planes in orthographic projections Determination of true shapes of planes	4
15.1.4	PLANE GEOMETRY	Angle construction Construction of plane shapes Construction of conic sections Plotting a loci	4
15.1.6	INTERSECTION OF LINES AND PLANES	Construction of lines Determination of shortest distance True lengths	4

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

Activity

Show and describe different drawing equipment Generate different sizes of paper Draw different types of lines Print letters and numbers

Assessment

Oral Test Written Test Timed Practical Test

THEORY

Objectives

By the end of the sub-module unit, the trainee should be able to: use sketching techniques to produce drawings, lines and boxes in free hand use construction lines and boxes to produce pictorial sketches

Key points

Sketching techniques - construction lines - box-in-method - scaled grid Pictorial sketches - hand tools - blocks - building components - scenery

Competencies

Ability to: apply free hand techniques use construction lines to produce pictorial sketches control or move a pencil so as to stay sharp

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