Observation

Questions 2 (a) and (b) did not pose any difficulty to the candidates but it was reported that candidates were not able to explain the process of bending a sheet of metal. The required responses are as given below.
2(a)      (i) Drilling Machine

• Stop the machine before removing chips/swarf.
• Hold the work properly in a vice.
• Bolt the vice when necessary to prevent it from spinning round.
• Use all protective guards on the machine.
• Never be tempted to hold small workpiece with hand.
• Do not wear loose dress.

• Remove chuck key before starting the machine.
• Do not remove chips/swarf with bare hand, use brush.
• Avoid distraction when drilling.
• Hold drill bit firmly in the chuck.
• Do not apply too much pressure while feeding.
• Do not use volatile or corrosive coolant.
• Wear goggles to prevent chips and other flying particles from entering the eye.

(ii) Grinding Machine

• Use eye guard and goggles to protect the eyes while grinding.
• Small workpiece should be properly held in a hand vice.
• Check grinding wheels for possible cracks and concentricity before use.
• Remove chips by suction when dry grinding.
• Maintain correct gap between tool rest and wheel.

(b)
(i)Scriber: used for marking/scratching/drawing lines on metal surface.
(ii)Trammel: used for scribing/drawing/bisecting/marking large arcs or circles.
OR
It is used to transfer measurement from rule to work.
(c) The process of bending a sheet of metal involves;

• marking out the point to bend;
• holding the work in vice/folding bar/folding machine;
• bending to the right shape using appropriate tool/machine.