Author: haroonkhan

Radial drilling machine is a heavy duty machine. It consists of a vertical column supporting a horizontal arm on which drill spindle can move in radial direction. The arm can be raised or lowered and swung around any position over the work. Two electric motors are used as shown in Figure 19.38, one used to provide movement…

Drilling: The operation of producing a circular hole by removing metal by rotating the cutting edges of a drill is known as drilling. Metal is removed by shearing and extrusion (Figure 19.31). Drilled hole is slightly oversized due to non-alignment of the tool and vibration of the spindle. For producing accurate hole, the drill bit selected…

Drilling machines are specified in the following ways:

Rake Angle: It is also known as helix angle. The angle between a plane passing through drill axis and leading edge of the land is known as rake or helix angle. It varies from 0° to 48°. Higher values are suitable for softer materials and lower values are suitable for harder materials. Point Angle: It is also…

The different parts of the drill bit are shown in Figure 19.30. Figure 19.30 Drill Nomenclature Flute: The helical groove in the drill body is known as flute. Its functions are to carry the chips, admit the coolant, make the chips to curl, and provide the cutting edges on the point. Point: It is conical part of the drill;…

The power from electric motor is transmitted to drill spindle pulley through V-belt. There is provision of key way on drill spindle to slide the stepped V-pulley. When drill is required to feed into the work, it is pressed against the work by means of feed handle. As the handle is rotated, pinion rotates and…

Drilling machine is one of the important machine tools in machine shop. It is mostly used to produce a hole in solid material. In a drilling, the hole is generated by cutting edges of rotating cutting tool known as drill bit which exerts large force on the workpiece fixed on the table. Drilling, boring, counter…

There are some differences between shaper and planer which are mentioned in Table 19.1.   Table 19.1 Difference Between Shaper and Planer Shaper Planer Cutting takes place by reciprocating tool over the job.Feed is given to the job during the idle stroke of the ram.The tools used on shaper are smaller and lighter.This is suitable for smaller…

Planer can be specified in the following ways: