Category: Machine Tools

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… Continue reading Some Important Angles on a Drill

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;… Continue reading Drill Bit

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… Continue reading Driving Mechanism in Drilling Machine

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… Continue reading DRILLING MACHINE

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… Continue reading Difference Between Shaper and Planer

Planer can be specified in the following ways:

A driving mechanism of a planer consists of an electric motor situated over the housing. The motor shaft is coupled with a counter shaft. The counter shaft, at its extreme end, carries two driving pulleys: one for open belt and other for cross belt. The main driving shaft is provided below the bed. Its one… Continue reading Fast and Loose Pulleys Driving Mechanism of Planer

A constructional detail of planer is shown in Figure 19.27. Following are the components of the planer: Figure 19.27 Constructional Details of Planer Bed: Bed is a cast iron structure; it is very large and heavy and supports whole structure of the machine over it. Table: Table is made of cast iron. At its top, it carries longitudinal T-slots… Continue reading Constructional Detail of Planer

Shaper can be specified in the following terms:

Rotary motion of the bull gear is converted into a reciprocating motion of the ram through the crank and arm. The cutting is done in the forward stroke and the return stroke is idle. The time of return stroke is reduced to compress the total machining time which is known as quick return mechanism. The… Continue reading Crank and Slotted Arm Quick Return Mechanism