Teaching syllabus for technical drawing
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- UNIT 3 ORTHOGRAPHIC PROJECTIONS
| UNIT SPECIFIC OBJECTIVES CONTENT TEACHING AND LEARNING ACTIVITIES EVALUATION UNIT 2 DIMENSIONING UNIT 3 ORTHOGRAPHIC PROJECTIONS The student will be able to 2.2.1 explain the principles of dimensioning. 2.2.2 explain the importance of dimensioning . 2.2.3 apply the principles of dimensioning. 2.3.1 explain orthographic projection 2.3.2 explain the principles of both first and third angle projections. 2.3.3 distinguish between first and third angle projections. 2.3.4 draw objects in first and third angle projections. Principles of dimensioning. Scaling and accuracy. The use of dimension line. Importance of dimensioning. Application of principles of dimensioning. Orthographic projections Principles of first and third angle projections. First and third angle projections. The vertical and horizontal planes. First angle projection, the object is between the viewer and the plane Third angle projections, the plane is between the viewer and the object. Drawing in first and third angle projections. Symbols for first and third angle projections. Correct positioning of views. Group students to discuss the principles of dimensioning. Using charts, assist students to discuss the importance of dimensioning. Using charts, illustrate the application of principles of dimensioning to students. Guide students to practise how to dimension drawn objects. Note: Emphasize how to dimension circles, radius, curves, holes and circular parts, rods, angles and small measurements. NOTE Refer to BS and BS. 1192. Discuss orthographic projections with students Using charts and models discuss the principles of first and third angle projections. Illustrate the vertical and horizontal planes. Discuss the differences and similarities between first and third angle projections. Illustrate how to draw in first and third angle projections and assist students to practise. Guide students to show the appropriate symbols for each projection. Guide students to practise orthographic drawings using selected objects. NOTE: Emphasize neat work, correct projection, symbols and construction lines. Students to explain the principles of dimensioning. Students to explain the importance of dimensioning. Students to dimension given drawings correctly using BS 308 and BS 1192. Students to explain orthographic projections. Students to explain the principles of first and third angle projections. Students to explain the differences between first and third angle projections Groups students to draw objects in first and third angle projections stating at least, six major dimensions correctly and indicating the correct symbols for each projection and submit report Download 431.69 Kb. Share with your friends:
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