basic drafting

LESSON PLAN in Technology and Livelihood Education

                      BASIC DRAFTING   

I.                    Objective:

At the end of the lesson , the student should be able to

a.       Recognize the 3 basic views of an object with the corresponding principles

b.      Distinguish the importance of knowing the views of an object and its principles.

c.       Draw/perform on how to analyzed objects using the 3 views.

II.                 Subject Matter

Topic: Orthographic Drawing

Reference:  Basic Drafting Vol. 1 pg. 53-56

Materials: computer and projector

Skills: Listening and observing, ability to apply the principles of Orthographic

Sketching

Values to be developed: Knowledge, creativity, accurateness.

III.               Procedure

A. Introduction

(The teacher shows a box for projection and the students are expected to answer these following questions: )

a.       Does this object have sides?

b.      what is this box? How many sides a box can have?

c.       So in connection to this projection box and other sample objects that we’re viewing, what do you think is our lesson for today with regards to giving or naming and filing sides of an object?

d.      Is there any guidelines or principles that we must know first in order to understand and to be oriented on how to do this? Can you name some?

      B. Development

            1. Setting Standards

               a. The teacher conducts a short lecture about the derivation of the word

orthographic and a short lecture about the  priciples of orthographic drawing  and sides of projection box when it laid flat on one plane.

               b. The Teacher shows a sample on how to identify the sides of an object, how to

    project or draw and plot it down.

               c. the students are expected to observe keenly on how to do it.

               d. the class will be grouped by 3teams to brainstorm and give farther explanations about

      the priciples and how does it affect the different views and measurement of the object

      being projected right after the teacher’s demonstration.

2. The teacher Directed Demonstration Proper

     ( Another objects will be demostrated anchoring the different priciples. Here are some:)

2.1.

2.2.

            2.3.

3. The Execution/ activity

            (After the teacher’s demonstration, the teams will be given different objects to be projected, “anchoring also to the different principles” this orthographic projection will be written in a manila paper.)

            Team 1 –

Principles no. 1-The top view is directly above the      Front view.

                     2. The side views are horizontally inline with Front view

                     3. The width of the Top view is equal to the width of side views.

                    4, When the line or an edge is viewed perpendicularly to a plane of projection, it appears as point

 Team 2-

No. 5. A line or edge is parallel to the plane of projection will also appear as line or edge in its exact or true length.

      6. A line or an edge Inclined to the Plane of projection will apear shorter or foreshortened.

     7. A surface perpendicular to the projection plane will appear as a line or edge equal in length to the nearest edge of the surface, which in this case is either its length or width, depending on its position.

Team 3-    

                
                                8. A surface parallel to the plane of projection will be shown in its exact or true shape and size.

              9. A surface inclined to the plane of projection will also appear as a surface but smaller in size or shape.

             10. No line or edge of the object can be projected longer than its true length.

C. Conclusion

            Guide Questions

·        How do we view the front view of a line perpendicular to the top plane? And why?

·        From this object (blackboard) if we try to look at this side (which is one of the line on the sides of a blackboard, how can we view this area if we try to put it in parallel on the surface? Why?

·        If a line inclined to the top plane how can we view its front view? Is it still inclined or straightened or only dot ?

·        As what we’d gone through a while ago, based on your answers, so how is it important by the way to follow these principles when dealing with this aspect? Why?

D. Evaluation

            ( The students will be given activity  sheets to answer)

E. Assignment

            ( The students will be tasked to list at least 10 polygonal objects and identify its sides and draw its projection)