Lesson Notes By Weeks and Term - Senior Secondary 2

Auxillary views

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TERM – 2ND TERM

WEEK EIGHT - NINE

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: Technical Drawing

Topic: AUXILLARY VIEWS

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

I.) Discuss Auxiliary Views of objects.

II.) Identify the types of Auxiliary Views of objects.

III.) Construct objects in the two types of Auxiliary Views.

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 introduces the Auxiliary Views of objects and it's types

Students listens attentively to the teacher                                                                         

STEP 2

EXPLANATION

Teacher guide students to construct objects in the two types of Auxiliary Views.

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

AUXILLARY VIEWS

An auxiliary view is a type of orthographic projection where the lines of sight are not parallel to the principal projection planes. In a regular orthographic view, there is a line representing the edge of the inclined surface. The auxiliary view is created by projecting, at right angles, from this edge line and drawing parallel to it.

Objects often have sloping or inclined surfaces that are not perpendicular to the plane of projection. In typical orthographic views, these surfaces are represented as distorted and do not accurately show their true shape. When a sloping surface contains an important feature that needs to be depicted without distortion, an auxiliary view is employed. The number of possible auxiliary views for any given object is indefinite.

 

Important notes about Auxiliary Views of Geometrical solids

  1. Auxiliary views are a type of orthographic projection used to determine the true size and shape of inclined and oblique surfaces of objects.
  2. Basically, auxiliary views are projected from existing principal views.
  3. Any number of auxiliary views of an object can be created. Successive auxiliary views can be created by projecting from an existing auxiliary view.

Types of Auxiliary Projection

There two types of auxiliary elevation, namely: First auxiliary elevation and Second auxiliary elevation.

  1. First Auxiliary Elevation or Plan: The first auxiliary elevation is projected from the normal (initial) plan view of the orthographic projection. The first auxiliary elevation is projected from the normal(initial) elevation of the orthographic projection.
  2. Second Auxiliary Elevation or Plan: The second auxiliary elevation is projected from the first auxiliary plan. The second auxiliary plan is projected from the first auxiliary elevation.

EVALUATION: 1.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively