Technical Drawing 3, WASSCE (SC), 2021

Question 1

 

Figure 1 shows three views of a block..

 

Make a full-size freehand isometric view of the block, making X the lowest point.

Observation

 

Majority of the candidates could not draw the isometric view correctly. While some could not present the faces as expected, others could not do good line work.

Below is the solution of with the areas of expectation on the question.


FREEHAND SKETCH THE ISOMETRIC VIEW OF THE BLOCK GIVEN IN ORTHOGRAPHIC PROJECTION

                             

 

                       
MAJOR STEPS/FEATURESREQUIRED IN THE CONSTRUCTION
  1. Sketching of the block in isometric projection
  2. Making ‘X’ the lowest point
  3. Resemblance
  4. Proportionality           
  5. Sketching face A                    
  6. Sketching face B                                
  7. Sketching face C                                
  8. Sketching face D                                
  9. Sketching face E                                
  10. Sketching face F                                
  11. Sketching face G                                
  12. Sketching face H                                
  13. Neatness and quality of lines