DRAWING INSTRUMENTS AND MATERIALS
Subject : BASIC TECHNOLOGY
Term : FIRST TERM
Week: Week 10
Class : JSS1
Previous lesson :
The pupils have previous knowledge of IDENTIFICATION OF RUBBER AND PLASTIC
Topic :
DRAWING INSTRUMENTS AND MATERIALS
Behavioural objectives :
At the end of the lesson, pupils would have learnt about
- different types of drawing instruments and materials
- Definition of drawing materials
- Types of drawing materials
- Examples of drawing ,materials
- Uses of drawing instruments and materials
Instructional Materials :
- Wall charts
- Pictures
- Related Online Video
- Flash Cards
- Drawing Materials
Methods of Teaching :
- Class Discussion
- Group Discussion
- Asking Questions
- Explanation
- Role Modelling
- Role Delegation
Reference Materials :
- Scheme of Work
- Online Information
- Textbooks
- Workbooks
- 9 Year Basic Education Curriculum
- Workbooks
CONTENT
Drawing Instruments and Materials.
SUB-TOPICS: (i) Definition of technical drawing.
(ii) Drawing Instruments and Materials
- Basic Techniques of handling and caring for drawing instruments and
materials.
Content Development (NOTES FOR FIRST LESSON/PERIOD ONE)
Sub-Topic 1: Definition of Technical drawing
Technical drawing is a universal language used for communication among technical people. A good and accurate drawing can only be made through constant practice with the aid of drawing instruments and materials.
Sub topic 2: Drawing Instruments and Materials
Drawing instruments and materials for technical drawing are:
- Drawing board
- Tee square
- Sets squares
- Protractor
- Compasses
- Dividers
- Drawing paper clips
- Scale rules
- French curves
- Metric rules
- Drawing paper
- Drawing pencils
- Eraser
- Sharpener or blade
- A drawing board is the wooden platform on which the drawing paper is placed before the drawing starts. The two main types are (a) full imperial size which is 812 x 585mm (b) half imperial (585 x 452mm) size.
- Tee square is used for drawing horizontal or parallel lines in conjunction with drawing board.
- Drawing pencils are of different grades used for general drawing, lettering or freehand sketching and technical or engineering drawing. We have B, 2B, 3B, 4B up to 8B and H, 2H, 3H, 4 H up to 8H pencils.
- A Compass: Used for drawing circles and arcs.
- A Divider: used for transferring measurement from the metric rule to the drawing.
- Set Squares: Are used to draw vertical or diagonal lines.
- Drawing Papers: are best held on the boards with the aid of clips or adhesive tape.
- The Protractor: is used for measuring and marking out angles.
- Scale Rules: Are used to produce reduced or enlarged sizes of objects.
- A Metric Rule: is used for drawing various types of curves.
- Drawing paper: This is the paper on which the drawing is produced.
- Eraser: A good eraser must erase cleanly without picking or tearing the surface of the paper.
EVALUATION
What is Technical Drawing?
Name four types of drawing instruments.
Content Development (NOTES FOR SECOND LESSON/PERIOD TWO)
Sub-Topic 3:Basic techniques of handling and caring for drawing instruments and
materials.
We need to take care of our drawing instruments in order to prolong their service life.
Drawing Board
- Do not use pins for fastening your paper to the board, use tapes or clips.
- Do not use blade or knife to cut something on the surface of your drawing board.
- Always cover the surface with cardboard or thick paper.
- Keep the drawing board in a safe place when not in use.
Tee-Square
- Never use the tee-square as a walking stick or as a cane.
- Do not use pen-knife or blade along the edge of the tee-square
- Always hand your square when not in use.
- Always keep your tee-square clean.
Set-Square, Scale Rules, Protractor and French Curves
- Do not use any sharp object such as razor blade or knife on their edges.
- Keep them away from fire.
- Always keep them in a safe place immediately after use to prevent leakage.
Pair of Compasses or Dividers
- When not in use, keep them away in a safe container.
- Never use compasses or dividers as paper holders.
- Do not use their needle points to punch holes.
Other Instruments
All other instruments should be kept in their packets after use. A cupboard should be made available for complete storage of the drawing boards and all other instruments.
Presentation
The topic is presented step by step
Step 1:
The class teacher revises the previous topics
Step 2.
He introduces the new topic
Step 3:
The class teacher allows the pupils to give their own examples and he corrects them when the needs arise
Conclusion
The lesson is concluded when the class teacher wraps up the lesson by giving the pupils some notes.
The class teacher also goes round to make sure that the notes are well copied or well written by the pupils.
He or she does the necessary corrections when and where the needs arise.
EVALUATION
- Why do we need to take care of our drawing instrument?
- How do we take care of tee-square?
- What are the uses of (a) drawing board (b) tee-square (c) set-square
READING ASSIGNMENT
Read about Drawing Instruments and Materials
TEXT: NERDC Basic Technology for Junior Secondary School 1 Chapter 5 pages 34 – 42
WEEKEND ASSIGNMENT
- _________ is used for drawing horizontal lines (a) French curves (b) compass (c) tee-square (d) divider
- French curves is made of ______ (a) wood (b) rubber (c) glass (d) plastic
- All of these are drawing instruments except (a) compass (b) drawing pencils (c) scale rule (d) knife
- It is good to use pins for fastening your paper to the board ______ Yes/No
- __________ is used for circle construction (a) compass (b) divider (c) eraser (d) scale rules
THEORY
- What is Technical Drawing
- How can we take care of Tee-Square
