Technical Drawing 3, WASSCE (SC), 2017

Question 5

 

Details of a pulley assembly are shown.  The pulley is held in position on the bracket by the pin from right to left.  With the points assembled, draw full size, the following:

(i)end view from arrow Y;

(ii)plan view from arrow X;

(iii)sectional front elevation on P – P.

Observation

 

Candidates were shown details of a pulley assembly.  They were asked to assemble the pulley and draw end view from arrow Y, plan view from arrow X and sectional front elevation on P – P.

Only few candidates attempted this question and their performance was fair.  However most of the candidate could not section the parts properly.

Candidates were expected to do the following:

         The end view from arrow Y

(i)         draw full size; 
(ii)        draw 3 – centre lines;
(iii)       draw the outline of the assembly;
(iv)       draw the bracket; 
(v)       draw the pulley;
(vi)      draw the pin;
(vii)      draw the washer; 
(viii)     draw 2 – holes in hidden;
(ix)       draw the web;
(x)      draw the cutting plane;
(xi)      write end elevation.
             
 b          The plan view from arrow X

( i)        draw full size; 
(ii)        draw 4 – centre lines;
(iii)       draw the outline of the assembly;
(iv)       draw the bracket; 
(v)       draw the pulley;
(vi)      draw the pin;
(vii)      draw the washer; 
(viii)     draw 2 – holes in hidden;
(xi)      write plan view.

c          The Sectional front elevation on P – P

( i)        draw full size; 
(ii)        draw10 – centre lines;
(iii)       draw the outline of the assembly;
(iv)       draw the bracket; 
(v)       draw the pulley;
(vi)      draw the pin;
(vii)      draw the washer; 
(viii)     draw 4 – equal diameter holes;

(ix)       section the bracket;
(x)      section the washer;
(xi)      section the pulley;
(xii)    write sectional front elevation;
(xiii)   draw neatly;
(xiv)    show good line quality.

 

The solution is shown below: