Page 19 - Demo

17GENERAL DRILLING HANDBOOK%u00bd%u0009Drill ClassificationsDrills can be classified based on the following criteria:Cutting PartThe cutting part of a drill consists of two main components: the major cutting edge and the flute.Major Cutting Edge:%u2022 V Bottom %u2013 Most common type, used for general applications.%u2022 Flat Bottom %u2013 Typically used for specific applications such as creating pilot holes, drilling shoulders, or for screw heads, or for spring, etc. It's also employed when the surface of the drill exit is not perpendicular to the central axis of the drill.%u2022 Self-Centering %u2013 Ideal for situations requiring drilling with an overhang or creating a self-lead for deep drilling in standard turning/milling centers.V BottomFlat BottomSelf-CenteringFlute Type:%u2022 Spiral Flute %u2013 Typically used for vertical drilling and provides effective chip evacuation. This is the most common flute type.%u2022 Straight Flute - Suited for horizontal drilling, such as in lathes or turning centers, and for deep drilling. It is also used for step drills. Spiral FluteStraight Flute