Technical Drawing 3, WASSCE (SC), 2020

Question 1

 

(1)       Figure 1 shows the plan and end elevation of a bearing support in first angle orthographic projection.

 

Make a freehand isometric drawing of the block, making K the lowest point

 

Observation

 

Majority of the candidates could not draw the isometric view correctly: in most cases the, linework is poor and the curves were inappropriately drawn.

 

FREEHAND SKETCH THE ISOMETRIC VIEW OF A BLOCK GIVEN IN FIRST ANGLE ORTHOGRAPHIC PROJECTION

The solution is shown below:

 

 

 

MAJOR REQUIREMENTS FOR THE CONSTRUCTION OF THE BLOCK

 

 

 

 

 

 

 

 

 

 


  • Sketching the casting in isometric      
  • Making ‘K’ the lowest point
  • Resemblance                                          
  • Proportionality                          
  • Sketching face A                       
  • Sketching face B                        
  • Sketching face C                        
  • Sketching face D                       
  • Sketching face E                        
  • Sketching face F (3 Holes)                  
  • Sketching face G and H
  • Neatness and quality of lines