Lesson Notes By Weeks and Term - Senior Secondary 3

INTRODUCTION TO COMPUTER- PARTS, SIMPLE PRACTICAL EXERCISE ON AUTOCAD FOR BUILDING AND MECHANICAL DRAWING

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TERM – 2ND TERM

WEEK TWO

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 5 periods each

Date:

Subject: Technical Drawing

Topic: INTRODUCTION TO COMPUTER- PARTS, SIMPLE PRACTICAL EXERCISE ON AUTOCAD FOR BUILDING AND MECHANICAL DRAWING

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

I.) Define AutoCAD

II.) Discuss the tools use in AutoCAD (draw tools and modify tools)

III.) Use AutoCAD to draw and make designs.

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 explains the concept, AutoCAD and discuss how useful it is to Technical drawing.

Students listens attentively to the teacher                                                                         

STEP 2

EXPLANATION

Teacher guide the students to used AutoCAD to draw and make designs on the computer.

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

INTRODUCTION TO COMPUTER- PARTS, SIMPLE PRACTICAL EXERCISE ON AUTOCAD FOR BUILDING AND MECHANICAL DRAWING

Computer aided drawing is a technique where engineering drawings are produced with the assistance of a computer and, as with manual drawing, is only the graphical means of representing a design. Computer aided design(CAD) however is a technique where the attributes of the computer and those of the designer are put together to solve a problem..

 It is a drawing package used for graphic constructions and designs.There are two types of tool used in AutoCAD. These include draw tools and modify tools.

Draw Tools

  1. The line command: With the Line command you can draw a simple line from one point to another. You can also draw lines by entering the co-ordinates of their end points at the command prompt rather than picking their position from the screen. This enables you to draw lines that are off screen, should you want to.
  2. The construction line command: The Construction Line command creates a line of infinite length which passes through two picked points. Construction lines are very useful for creating construction frameworks or grids within which to design.
  3. The Ray command: The Ray command creates a line similar to a construction line except that it extends infinitely in only one direction from the first pick point. The direction of the Ray is determined by the position of the second pick point.
  4. The polyline command: The Polyline or Pline command is similar to the line command except that the resulting object may be composed of a number of segments which form a single object.

Modify Tools

While working with AutoCAD, there are situations that require to use modify tools. As the name suggests, modify tools are used to modify existing lines and objects.

Using CADD for 2D objects

Two-dimensional(2D) computer drawing is the representation of an object in the single-view format which shows two of the three object dimensions or the muti view format where each view reveals two dimensions. In both cases, the database includes just two values for each represented coordinate of the object. It can also be a pictorial representation if the database contains X, Y coordinates only.

3D objects

Three-dimensional(3D) computer drawing is the coordinate format. Three dimensional computer aided drawing allows the production of geometric models of a component or product for spatial and visual analysis.

AutoCAD For Building And Mechanical drawing

The variety of drawings that are utilized in engineering are too numerous to illustrate individually here. A few examples from engineering disciplines will demonstrate the versatility of modern CAD systems.

  1. Aerospace: Layout drawings, part drawings, subassemblies, assemblies
  2. Chemical: Process schematics, process plant layout drawings
  3. Civil,Construction: Structural detail drawings, site plan drawings, construction drawings, road-use plans.
  4. Electrical, Computer: Circuit board design, very large system integration (VLSI) design
  5. Industrial and Manufacturing: Manufacturing plant layout drawings, subassemblies, assemblies
  6. Mechanical: part drawing, subassemblies, assemblies.

Activity: Teacher guide students on how to use AutoCAD in

EVALUATION: 1. What is AutoCAD?

  1. How is AutoCAD useful to Technical drawing.
  2. Using AutoCAD, draw a one room apartment building plan.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively