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Technical Drawing Paper 1, May/June 2009  
Questions: 1 2 3 4 Main
General Comments
Strength
Weakness/Remedies


















Question 4

The figure below is a lever mechanism in a lifting device.  Draw the lever full size and show all points of tangency and the construction lines.

 

This question is on combination of (1) the tangency of lines and circles, (2) tangency of curves and circles and (3) tangency of circles.  The centre of the curves are determined by either the addition or subtraction of the given radius or dimension of the tangential parts.  The required solution is given below:

 

 



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OBSERVATION

A good percentage of the candidates who failed this question were those who did not know the principle of addition or subtraction of the given dimensions of tangential parts.


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