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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