Civil Engineering Reference
In-Depth Information
Fig. 11.9. Stub, standard and long series drills. Longer drills are available.
Length of drill
Twist drills are available in many lengths from short stub drills up to very long
drills for extra deep holes. If drilling a deep hole, it pays to start off with a short
drill and increase the length of the drill as you drill deeper. This will enable the
swarf to be easily removed.
