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THE BENCH DRILL

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					             THE BENCH DRILL




There are two types of machine drill, the bench drill and the pillar
 drill. The bench drill is used for drilling holes through materials
  including a range of woods, plastics and metals. It is normally
bolted to a bench so that it cannot be pushed over and that larger
              pieces of material can be drilled safely.




             THE PILLAR DRILL
The larger version of the machine drill is called the pillar drill. This
 has a long column which stands on the floor. This can do exactly
the same work as the bench drill but because of its larger size it is
   capable of being used to drill larger pieces of materials and
                       produce larger holes.



                          SAFETY
                       1. Always use the guard.
             2. Wear goggles when drilling materials.
       3. Clamp the materials down or use a machine vice.
          4. Never hold materials by hand while drilling.
        5. Always allow the ‘chippings’ to clear the drill by
                 drilling a small amount at a time.
            6. Follow all teacher instructions carefully.




             EXAMPLES OF BITS USED
             WITH DRILLING MACHINES




                            Twist Drill

              Used for drilling holes. A normal drill set
               will include sizes from 1mm to 14mm.
                          Forstner Bit

  Used for larger diameter holes. When using this bit the hole is
   drilled very slowly so that the bit does not 'jam' in the wood.




                           Hole Saw
 For large diameters a 'hole saw' can be used. The advantage of
   this type of drill bit is that the blade can be changed to give
                      different sizes of diameter.




      1. Draw a bench drill and label the most important parts.
  2. List safety factors regarding the use of the drilling machines.
3. Demonstrate the use of the bench/pillar drill to a group of pupils,
                          emphasising safety.

				
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