Technical Drawing 3, WASSCE (SC), 2016

Question 5

  • The figure below shows the three views of a machine component in first angle projection.  Draw, full size, in first angle the:
                           

  • front elevation;
  • sectional plan Y – Y;
  • sectional end elevation X – X.
  • (Hidden details are required on the sectional views)

     

     

    Observation

    Candidates were required to draw the full size of the given views of a machine.  Very few candidates attempted this question and their performance was above average.
    Candidates were expected to:

    Front Elevation

    (i)         draw in first angle projection;
    (ii)        draw full-size;
    (iii)       draw the outline;
    (iv)       draw 3 centre lines;
    (v)        draw face – A;

    1. draw the web – W;
    2. draw the vertical hole in face – A (hidden);
    3. draw 2 – cutting planes X – X and Y – Y;
    4. draw face – B;
    5. draw FACE – C/horizontal hole;
    6. draw the base, threaded and countersunk holes.

    Sectional Plan  Y – Y

    (i)         draw in first angle projection;
    (ii)        draw full-size;
    (iii)       draw 6 centre lines;
    (iv)       draw the outline;

    1. draw the web – W;
    2. draw 2 – threaded holes/2 – countersunk holes;
    3. draw the base;
    4. draw face – B;
    5. section web – W;
    6. show hidden details.

    .
    Sectional End Elevation X – X

    (i)         draw in first angle projection;
    (ii)        draw full-size;
    (iii)       draw the outline;
    (iv)       draw the 4 – centre lines;

    1. draw face – A ;
    2. draw face – B;
    3. draw shaft – C;
    4. draw the base/threaded holes;
    5. draw the horizontal hole in face – C;
    6. draw the vertical hole in face – A;
    7. section the face – A;
    8. section face – C;
    9. section the base;
    10. show the web – in hidden;
    11. draw neatly.

    The solution is shown below