Teaching syllabus for technical drawing

14
UNIT
SPECIFIC OBJECTIVES
CONTENT
TEACHING AND LEARNING
ACTIVITIES
EVALUATION
UNIT 4

SECTIONAL VIEWS
AND TRUE SHAPES
OF CUT SURFACES

The student will be able to
2.4.1 explain the concept of sectioning
2.4.2 state the importance of sectioning.
2.4.3 explain the true shape of cut surfaces of various geometrical objects.
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2.4.4 explain and apply the principles of drawing the true shape of a cut surface.
2.4.5 construct true shapes of cut surfaces.
2.4.6 explain and apply the rules for hatching the true shape of a cut surface.
2.4.7 apply principles of sectioning to draw conic sections. Sectional views and true shapes of cut surfaces of various geometrical objects prisms, cylinders, pyramids and cones. Importance of sectioning. True shapes of cut surfaces. Application of drawing true shapes of cut surfaces. Construction of true shapes. Rules for hatching. Applying principles to draw conic sections. Use models and charts to brainstorm the concept and importance of sections. Guide students to discuss the importance of drawing true shapes of cut surfaces of objects (e.g. truncated and frustums. Use charts and models to discuss the true shapes of cut surfaces of solids. Display objects of various shapes of cut surfaces with corresponding charts of their true shapes for students to match. Illustrate how to apply the principles of constructing true shapes of cut surfaces. Guide students to apply the principles of sections to construct true shapes of cut surfaces. Students to brainstorm the rules for hatching true shapes of cut surfaces of objects. Use charts to discuss the rules for hatching a true shape of a cut surface and assist students to practise (e.g. angle of inclination of lines and spacing. Guide students to apply the principles and rules for drawing sectional views of cones. Students to state the concept of sectioning. Students to state reasons for sectioning. Students to explain the principles of constructing true shapes of cut surfaces. Students to construct the true shape of cut surfaces of solids. Students to draw the true shapes of sections of cones.

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