There is different operation performed with drilling machine as the manufacturing process involves holes to be accomplished. Different drill bit must be required to carry out the operation of various types.
Most people today think drilling is perform only on soft materials like wood, but the fact is that drilling is perform on hard material like metal as far the drill bit is harder than the workpiece.
Operations of drilling machine
The following stated below are the operations that can be achieve with drilling machine;
This is the most common operation done with drilling machine. It is applied when a circular hole of any size is needed in a workpiece. Although one can use lathe machine for drilling.
Cores are used when sand casting are made to displace the metal where metal are desired. The molten metal flows around the core and after it solidifies the casting is removed from the mold and the holes are created on the core spaces. The hole here is quite rough and will require heavy body drill to clean the holes.
In this drilling operation more than one diameter can be ground on the drill body, which serves as an extra operation
Boring is done to enlarge the diameter of an existing hole of a part. The tool use in this operation is generally a single-point cutting tool.
This is finishing of a drilled hole in order to obtain the specific size, fine surface, and making the diameter the same size form end to end. The sufficiently smooth hole is desired and called will be called a precision hole as greater accuracy is required.
Counter boring is when another drill bit of larger size than the first will be used to open a wider hole. It is said to be used of counterbore when the operation is done on drilling machine. The small diameter on the end of the tool is known as pilot keeps the counterbore concentric with the original hole. This pilot is interchangeable with others different sizes to fit the various sizes of holes.
Drilling machine performs this operation to produce an angular surface at the end of a hole. It is made of different angles and diameters sizes. The angle size depends on the countersinking purposes. Countersink for a flathead screws requires an 82 included angle, keeping the center hole at angle 60. Different rivet head types included angles from 90 to 145-degree
Spot facing is done in order to create space for bolt head, washer or nut. It is usually performed on casting, machining a flat or circular surface around the work piece. However, counterbore may be used for the operation.
This drilling machine operation is by creating tapped (threaded) hole on a workpiece. It is achieved by producing a non-tapped hole on the material, using a specified size drill bit. A tapping attachment will then be used to create the threading using a standard drilling machine.
This tapping attachment is held in the spindle of the drill press, which is accurately centers on the drilled hole.
Trepanning is a hole making operation, producing an annular groove making the center a solid cylindrical core. In this operation, a cutter consisting of one or more cutting edges placed along the circumference of a circle in order to achieve the annular groove. Trepanning is say to be feasible if the hole has diameter of more than 50mm.
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