EXERCISE NO. 2 (Part 3) - POWER TOOLS - DRILLING
Mark out of 10 Marks:
No 1. Drilling machine size is determined by:
(a) The largest drill that will fit in the machine
(b) The largest piece of work that can fit on the drilling machine table below the drill
(c) The largest diameter work piece that can be drilled on centre
No 2. As compared with a 30 mm diameter drill, a 15 mm diameter drill should be run at:
(a) Half the speed (b) Twice the speed
(c) The same speed (d) The square of the speed.
No 3. To achieve a cutting speed of 40 metres per minute, a 30 mm diameter drill should be run at:
(a) 400 rev/min (b) 300 rev/min
(c) 750 rev/min (d) 1200 rev/min.
No 4. The correct feed for a drill is influenced by:
(a) Only the diameter of the drill
(b) Only the hardness of the metal to be drilled
(c) Both the diameter of the drill and the hardness of the metal to be drilled
(d) The power of the drill.
No 5. A drill point that is ground with one lip shorter than the other:
(a) Will not cut at all
(b) Will drill a hole having the same diameter as the drill
(c) Will drill a hole having a smaller diameter than the drill
(d) Will drill a hole having a larger diameter than the drill.