Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: First Term
Week: 2
Age: 15 years
Duration: 45 minutes
Subject: Technical Drawing
Curriculum Theme: Technical Drawing
Previous Lesson: Drawing Materials and Equipment.
Topic: BOARD PRACTICE
Subject Matter: Technique of fixing drawing sheet to drawing board, drawing border line, drawing title block, freehand lettering in lower and upper case, basic lettering styles such as gothic and italic.

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

State the steps for properly fixing a drawing sheet to the drawing board.
Explain the purpose of a border line and a title block in a technical drawing.
Identify the principles of good freehand lettering.

Affective Domain:

Appreciate the importance of neatness and accuracy in technical drawing.
Show patience and attention to detail when performing drawing board practices.

Psychomotor Domain:

Accurately fix a drawing sheet to the drawing board.
Draw a correct border line and title block on a drawing sheet.
Demonstrate freehand lettering in both lower and upper case.
Practice basic lettering styles such as gothic and italic.

Work independently on assigned drawing tasks.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Technical Drawing.
State Unified Scheme of Work for Senior Secondary Technical Drawing.
Technical Drawing for Senior Secondary Schools by A.B. Oluyemi.

Instructional Materials

The teacher will teach this lesson with the aid of:

Drawing board
Tee square
Pencils (HB, 2H)
Eraser
Sharpener
Drawing sheets (A3 or A4)
Masking tape or drawing clips
Prepared charts showing examples of border lines, title blocks, and lettering styles.

Rationale for the Lesson

This lesson helps pupils develop fundamental skills in technical drawing. Mastering sheet fixing, border lines, title blocks, and lettering is important as these are the basic preparations for any technical drawing work and ensure clarity and professionalism in their drawings.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of drawing instruments like pencils and rulers, and understand the need for precision in drawing.

Lesson Content/Board Summary

BOARD PRACTICE

1. Technique of Fixing Drawing Sheet to Drawing Board

Fixing the drawing sheet correctly is the first step to ensure accurate and neat drawings. A poorly fixed sheet can lead to inaccurate lines and angles.

The following are the steps for fixing a drawing sheet:

Place the drawing sheet on the drawing board, ensuring the top edge is slightly below the top edge of the Tee square.
Align the top edge of the drawing sheet with the working edge of the Tee square.
Secure the top left corner of the sheet to the board using masking tape or a drawing clip.
Slide the Tee square down and secure the top right corner.
Slide the Tee square further down and secure the bottom left and bottom right corners, ensuring the sheet remains taut and free of wrinkles.

2. Drawing Border Line

A border line frames the drawing area and gives a professional finish. It also defines the printable area of the sheet.

Standard dimensions for border lines from the edge of the sheet are:

Left side: 20mm (to allow for binding)
Top, Right, and Bottom sides: 10mm each

3. Drawing Title Block

The title block provides essential information about the drawing. It is usually located at the bottom right corner of the drawing sheet.

The following information is typically included in a title block:

Name of the school/institution
Title of the drawing
Name of the pupil
Class/Grade
Date of drawing
Scale of the drawing
Drawing number
Symbol for projection method (e.g., first angle or third angle projection)

4. Freehand Lettering

Freehand lettering is the art of writing text without using a ruler or stencil, ensuring legibility and uniformity. It is important for adding notes and dimensions to drawings.

Principles of good freehand lettering include:

Uniform height and spacing of letters.
Consistent slant (if italic) or vertical alignment.
Clear and distinct strokes for each letter.
Appropriate line thickness.

Pupils should practice both upper case (capital letters) and lower case (small letters) lettering.

5. Basic Lettering Styles

Different lettering styles are used in technical drawing for various purposes.

Common basic lettering styles include:

Gothic Lettering: This is a simple, sans-serif, vertical style often used for clarity and readability. It has uniform line thickness.
Italic Lettering: This style involves a slight forward slant (typically 75 degrees from the horizontal) to the letters. It is often used for emphasis or specific types of notes.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction/Motivation
Teacher’s Activity: The teacher greets the pupils and introduces the topic by asking them what they think is the first thing to do before starting any drawing on a sheet of paper. The teacher explains that just as an artist prepares their canvas, a technical drawer must prepare their drawing sheet.
Pupils’ Activity: Pupils respond to the questions and listen attentively to the introduction.
Learning Point: Pupils understand the importance of initial preparation in technical drawing.

Step 2: Fixing Drawing Sheet to Drawing Board

Time: 10 minutes
Teaching Skill: Demonstration/Explanation
Teacher’s Activity: The teacher demonstrates the correct procedure for fixing a drawing sheet to the drawing board using a Tee square and masking tape. The teacher explains each step clearly and ensures all pupils can see the demonstration.
Pupils’ Activity: Pupils observe the demonstration carefully, ask questions for clarification, and then practice fixing their own drawing sheets to their drawing boards.
Learning Point: Pupils learn and practice the skill of correctly fixing a drawing sheet.

Step 3: Drawing Border Line

Time: 8 minutes
Teaching Skill: Demonstration/Guided Practice
Teacher’s Activity: The teacher demonstrates how to measure and draw the border lines on the fixed drawing sheet, emphasizing the standard dimensions (20mm left, 10mm others). The teacher walks around to provide individual guidance.
Pupils’ Activity: Pupils, guided by the teacher, measure and draw the border lines on their drawing sheets.
Learning Point: Pupils learn to draw accurate border lines according to standard specifications.

Step 4: Drawing Title Block

Time: 7 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains the purpose and common contents of a title block. The teacher then demonstrates how to draw a simple title block at the bottom right corner of the drawing sheet and indicates where specific information should be placed.
Pupils’ Activity: Pupils draw the outline of a title block on their drawing sheets and note down the information to be included.
Learning Point: Pupils understand the importance of a title block and can draw its basic structure.

Step 5: Freehand Lettering (Upper and Lower Case)

Time: 8 minutes
Teaching Skill: Demonstration/Practice
Teacher’s Activity: The teacher demonstrates good freehand lettering techniques, focusing on uniformity in height, spacing, and stroke quality for both upper and lower case letters. The teacher provides guidelines on the board.
Pupils’ Activity: Pupils practice freehand lettering within their title blocks and in designated practice areas on their sheets, paying attention to the teacher’s guidelines.
Learning Point: Pupils begin to develop skills in legible and uniform freehand lettering.

Step 6: Basic Lettering Styles (Gothic and Italic)

Time: 5 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains and briefly demonstrates the characteristics of Gothic and Italic lettering styles, showing how they differ from standard vertical lettering. The teacher uses a chart to illustrate.
Pupils’ Activity: Pupils observe the different lettering styles and attempt to practice simple words in these styles.
Learning Point: Pupils are introduced to and practice basic technical lettering styles.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

List three steps involved in fixing a drawing sheet to the drawing board.
State the standard dimensions for drawing a border line from the edges of a drawing sheet.
Mention three pieces of information typically found in a title block.
Explain what freehand lettering means in technical drawing.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarisation/Assignment
Teacher’s Activity: The teacher summarises the key points of the lesson, reiterating the importance of proper board practice. The teacher gives an assignment to practice fixing sheets, drawing border lines, title blocks, and freehand lettering at home.
Pupils’ Activity: Pupils listen to the summary and copy the assignment.
Learning Point: Pupils consolidate their learning and are encouraged to practice further.

Lesson Keywords

Drawing Board – A flat, smooth surface used as a base for technical drawing.
Tee Square – A T-shaped drawing instrument used to draw horizontal lines and to guide triangles for vertical and inclined lines.
Border Line – A line drawn around the edges of a drawing sheet to define the drawing area.
Title Block – A block of information usually located at the bottom right of a drawing sheet, containing details about the drawing.
Freehand Lettering – The art of writing text clearly and uniformly in a technical drawing without using mechanical aids.
Gothic Lettering – A simple, vertical, sans-serif lettering style with uniform line thickness.
Italic Lettering – A lettering style where letters are slanted forward, typically at 75 degrees.

Differentiation

For pupils who grasp the concepts quickly, the teacher can challenge them to draw a more complex title block or practice different sizes of lettering. For pupils needing additional support, the teacher can provide more one-on-one guidance during practical sessions and provide pre-drawn guidelines on their sheets to assist with lettering and layout.

Note for teachers using this lesson plan

Ensure that each pupil has access to the necessary drawing instruments for the practical sessions. Emphasize neatness and precision throughout the lesson. Encourage regular practice for lettering as it is a skill that improves with repetition. Provide positive feedback and constructive criticism to motivate pupils.