Question 5
Details of a pulley bracket are shown in the figure above. To assemble, each of the bushing is fitted into the bracket and the pulley. These are then held in position by the spherical head pin.
The washers are to be positioned correctly before assembly with a split pin
Draw, full size, in first angle projection the assembly:
- plan view;
- sectional front elevation on X – X;
- end elevation in the direction of arrow Y.
NOTE: Do not show the split pin
Observation
Very few candidates attempted this question and their performance was fairly okay. Most of the candidates could not assemble the parts correctly and draw the end elevation.
Candidates were expected to do the following:
THE PLAN
(i) draw in first angle projection;
(ii) draw full size;
(iii) draw the outline;
(iv) draw 3-centre lines;
(v) draw the cutting plane x – x ;
(vi) draw the bracket;
(vii) draw the web;
(viii) draw the pulley;
(ix) draw the sphere head pin;
(x) write plan;
(xi) draw neatly.
SECTIONAL FRONT ELEVATION ON X – X
(i) draw in first angle projection;
(ii) draw full size;
(iii) draw 3-centre lines;
(iv) draw the outline;
(v) draw the bracket;
(vi) draw the sphere head pin;
(vii) draw the pulley;
(viii) draw the 2-bushes;
(ix) draw the 3-washers;
(x) draw the web;
(xi) section the bracket;
(xii) section the pulley;
(xiii) section the 2-bushes;
(xiv) write sectional front elevation;
(xv) draw neatly.
THE END ELEVATION IN THE DIRECTION OF ARROW Y
(i) draw in first angle projection;
(ii) draw full size;
(iii) draw 6-centre lines;
(iv) draw the outline;
(v) draw the bracket;
(vi) draw the sphere head pin;
(vii) draw the pulley;
(viii) draw the 3-washers;
(ix) draw the web;
(x) draw 2-holes in bracket;
(xi) write end elevation;
(xii) draw neatly.
The solution is shown below:
