Candidates were asked to make a neat freehand pictorial sketch of a twist drill. Majority of the candidates could not distinguish between a twist drill and a drilling machine, hence their performance was poor.
Candidates were expected to do the following:
- sketch using freehand;
- sketch pictorial view;
- draw for resemblance;
- draw to proportionality;
- draw lip-angle;
- draw lip;
- draw land;
- draw flute;
- draw shank-parallel/taper.
The solution is shown below:
