Drilling is the process used to produce a cylindrical hole in a specific solid section of a workpiece. A drilling operation is rotational and involves linear feed motions. The action of the drill removes the material to create a hole. The drill type can and does vary according to the machine, the machinist, the material and the specifications. While drills like the twist drill have been in existence for more than 200 years, this is not the only type of drill popular for drilling operations.
Drills provide a singular function. However, not all drills operate efficiently and effectively in all circumstances, with all materials or machines. The following are three of the most common or popular types of drills.
- Screw Machine Length (Stab Drills): this type of drill came into existence for use in a screw machine
- Jobber Length: This type of drill is an extremely versatile type
- Taper Length Drills: This most common use for this type of drill is in lathes
Machinists have the use of any of these common types of a drill in an average drilling operation. However, they are not the only ones. Others perform specialized tasks.
Specialized Drilling Tools
Other drills are available for those who are going to execute a specific operation. These form part of an extensive list that includes:
- Conventional point
- Split or crankshaft point
- Notched points
- Helical points
- Bickford point
- Double angle point
- Reduced rake points
- Low angle points
This list is not finite.
The Drilling Operation
Drilling is a process that requires the right tool. While a drilling operation may not seem complex, the choice of the right drill and drill bit for the task is essential. Selecting the wrong types can result in failure to complete the job according to the exact specifications demanded by customers.
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