Choice of method
Drilling is a methods that make cylindrical hole in a workpiece with a drill bit. It is one of the most common machining operations in steel.
Drilling can be divided into:
Short-hole drilling
Short-hole drilling refers to the machining of a hole with a relatively small ratio between hole depth and hole diameter. 3-5 times the diameter is a common drill length for a short hole drill.
Deep hole drilling
Deep hole drilling. The limit for when we start talking about long hole drilling is 10-12 times the diameter. Today there are methods for drill lengths up to 150xD.
Boring
Boring, where an existing hole is widened, usually to improve the hole surface and tolerances.
Trepanning
Trepanning is a technique used for drilling larger hole diameters where machine power is limited as it is not as power consuming as conventional drilling. The trepanning tool does not machine the whole diameter, only a ring at the periphery.
What type of drilling can be done in a radial drilling machine ?
- Drilling
- Counterboring
- Countersinking
- Tapping
- Reaming
A radial drilling machine.
What is the most common drill today?
The twist drill is one of the most common drills used today.
The traditional high-speed steel twist drill remains a common tool, but it has evolved, both through modern surface coating and changed geometries. In addition, there are different types of carbide drills that have been developed to increase productivity and increase service life.
A twist drill.
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