Lesson Notes By Weeks and Term - Senior Secondary 2
REVISION OF CONSTRUCTION DETAILS AND ORTHOGRAPHIC PROJECTION
REVISION OF CONSTRUCTION DETAILS AND ORTHOGRAPHIC PROJECTION
TERM – 3RD TERM
WEEK NINE
Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes of 5 periods each
Date:
Subject: Technical Drawing
Topic: REVISION OF CONSTRUCTION DETAILS AND ORTHOGRAPHIC PROJECTION.
SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to
I.) Construct objects in orthographic 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 guide students to construct objects in orthographic views |
Students listens attentively to the teacher and participate actively . |
|
STEP 2 NOTE TAKING |
The teacher writes a summarized note on the board |
The students copy the note in their books |
NOTE
REVISION OF CONSTRUCTION DETAILS AND ORTHOGRAPHIC PROJECTION
Orthographic projection is a method for creating a two-dimensional representation of a three-dimensional object. It is a type of parallel projection where the object is projected onto its orthogonal, or perpendicular, planes.
Orthographic projections are important because they are used to communicate the specifics of a three-dimensional object clearly and without ambiguity.
Orthographic Views
Typically, an orthographic projection drawing consists of three different views: a front view, a top view, and a side view. Occasionally, more views are used for clarity. The side view is usually the right side, but if the left side is used, it is noted in the drawing.
Right side orthographic view
To draw one of the views of an object, use lines to represent changes in depth. For example, consider this object above with its right side view orthographic projection.
Notice that there are lines where there are any depth changes in the structure; this changes the right side view of a three-dimensional object into a two-dimensional picture. These next two images show the front view and the top view of the same object.
Front side orthographic view
Top orthographic view
Measurements of orthographic projection
In an actual orthographic projection, all of the views are included on the same page. Normally, the front view is in the lower left corner of the page, the top view is in the upper left corner, and the right side view is in the lower right corner. The same scale is used for all three of the drawings, and their lengths, widths, and heights are all lined up.
EVALUATION: 1. Construct the shape below in orthographic view.
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively