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Technical Drawing Paper 1,Nov/Dec. 2008  
Questions: 1 2 3 4 Main

 

General Comments
Strength
Weakness/Remedies









































Question 3

Construct the involute of a circle whose diameter is 28mm.



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OBSERVATION

The question was well attempted by the candidates and a good majority got it correctly.  It is a question on involute of a circle and it required the candidates to

    1. draw the required circle;
    2. divide the circle into 8 or 12 equal parts;
    3. draw tangents from each point;
    4. mark out the points and join them with smooth curves.

The expected solution is shown below.

 

 

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