waecE-LEARNING
Technical Drawing Paper 1,Nov/Dec. 2012  
Questions: 1 2 3 4 Main
General Comments
Strength
Weakness/Remedies









Question 2

The figure below shows a crank mechanism.  The crank OJ rotates uniformly anticlockwise about O and the lever KL is pivoted at L.

            Using the given dimensions, construct the locus of point P for a complete revolution of OJ

 
_____________________________________________________________________________________________________
OBSERVATION

Candidates were expected to:

  1. draw 4 given centre lines;
  2. draw the given layout with circle radius OJ outlined;
  3. divide the circle into 8/12 parts;
  4. draw the arc, radius LK;
  5. locate different positions of the link JK from the circumference of the circle to the arc;
  6. locate different positions of point P on the links;
  7. join points P into a smooth curve.

The solution is shown below
           

 
Powered by Sidmach Technologies(Nigeria) Limited .
Copyright © 2015 The West African Examinations Council. All rights reserved.