Lesson Notes By Weeks and Term - Senior Secondary 3

Block sectioning; solid blocks and assembled parts

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  4. Block sectioning; solid blocks and assembled parts

TERM – 1ST TERM

WEEK TEN

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 5 periods each

Date:

Subject: Technical Drawing

Topic: BLOCK SECTIONING; SOLID BLOCKS AND ASSEMBLED PARTS

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.)  Discuss the principles of Placement of Sectional Views.

II.) Section object.

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher discuss the principles of Placement of Sectional Views.

Students listens attentively to the teacher                                                                         

STEP 2

EXPLANATION

Teacher guide students to section objects.

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

BLOCK SECTIONING; SOLID BLOCKS AND ASSEMBLED PARTS

 

Principles of Placement of Sectional Views

  1. Whenever practicable, and except for revolved sections, you should project sectional views perpendicular to the cutting plane and place it in the normal position for third angle projection.
  2. Don't show the views in first angle projected position on a third angle projection drawing.
  3. When the preferred placement is not practical you may remove the sectional view to some other convenient position on the drawing, but it must be clearly identified, usually by two capital letters, excluding I, O, Q, and Z, and be labelled.
  4. Normally, you should not change orientation of the view, but if this becomes necessary, you must state the number of degrees through which it is revolved.

Examples:

1. Section through a solid shaft

2. Section through nut, bolts and stud assembly

3. Section through rivets

EVALUATION: 1. The figure below is a povot block. Draw it's section view looking in the direction of arrow A.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively