Drilling

There are three types of Drilling machine used in the Engineering room:

1. Bench Drills

2. Pillar Drills

3. Hand drills

1. Bench Drills

• Used for drilling holes through woods, plastics and metals.

• It is normally bolted to a bench so that it cannot be pushed over

2. Pillar Drills

• The Pillar drill is a larger version of the bench drill

• This has a long column which stands on the floor

• Because of its larger size it is able to drill larger pieces of materials and produce larger holes.

3 Hand drills

• These can be either electric, battery or hand operated

• There is a limit to the size drill bit that can be used

4. Safety on the drilling machine

• Follow all teacher instructions carefully.• Always wear safety goggles • Ensure the centre punch mark is under the drill bit• Clamp the materials down or use a machine vice.• Never hold materials by hand while drilling.• Always allow the chippings or swarf to clear the drill

by drilling a small amount at a time.• Reduce pressure when the drill bit is breaking through

Using the pillar or Bench drill

When Drilling, the piece must be held firmly using the following ways:

a) Machine Vice

b) Clamping directly to the table

c) Vice grips etc.

Drill bits• Twist drills are made

from High Speed Steel

• Smaller drill bits have parallel shanks, larger bits have taper shanks