3 types of boring tools

Boring has a wide range of applications, it can machine holes of different sizes and different precision grades. For holes with large diameter, high precision of size and location, boring is almost the only processing method. Boring on the lathe can be completed through mounting the holder and boring tool bar with cutter bit on the tool post and revolving the part. Boring machine is an equipment that can produce more accurate and smooth holes through enlarging existing holes which created by drilling or other techniques, it often used to process deep hole in workpieces oil cylinder, cylinder and hydraulic cylinder, or spindle hole, blind hole and step hole of machine tool.

There are three boring machines according to the processing:. Drilling uses drill bit while boring uses boring bar. The size of such a machine is given by the diameter of the largest workpiece which can be machined. Vertical turret lathe is basically a vertical boring mill and has turrent arrangement of holding the tools. It can do essentially the same jobs, but on a smaller scale. The machine looks like a turrent lathe, with its head stock resting on the floor and its axis vertical.

The table is usually called a chuck because of its adjusting jaws for work clamping. The distinguishing feature of the machine, however, is its five sided turrent, or tool holder mounted on the cross rail. It has five tool positions which enable successive tools to be brought into position without demounting.

The typical jobs which can be machined include boring and turning rail road wheels, locomotive cross-heads, large pistons, rings and gear blanks, bowls and many other similar round and symmetrical pieces. These are precision boring machines designed for high accuracy and surface finish.

Boring spindle is very precisely supported on ball, roller, hydrostatic or air bearings. Often, diamond tools are used. These are available in horizontal single end or double end type and vertical spindle fashions. Axial feed is given by cam or hydraulic cylinder. Recirculating ball screw drive is used for feeding to achieve higher position accuracy in numerically controlled boring machines.

Machining time in boring operation is calculated by the same formula as for calculating the machining time in turning operation,. The length of cut in this case is the depth of hole to be bored. Cutting speeds and feeds for boring are same as for turning.

A 10 mm drilled hole in a casting of 10 mm thickness is to be brought in alignment by boring. Boring tools are held in boring tool holders which may be either fixed or rotating type.

Fixed holders are used in work-rotating machines and rotating holders in tool rotating machines. Size of boring bar should be such as to provide maximum rigidity and also permit sufficient clearance for disposal of chips. Normally boring bar diameter is taken as 0. It should have minimum overhang. These are built with cartridges to hold throwaway type inserts adjustable in axial and radial directions by set screws. These are used for long bores and can accommodate fly cutters, tool blocks, cartridges etc.

These are supported at the feed end in suitable bearings. It is more rigid boring tool holder and is used for roughing and finishing of large bore to mm. Provision to offset cutting axially and radially exists.

This enables boring of large bores and facing of seating surfaces at right angles to the bore. Radial tool feeding facility also exists. We use cookies We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. Measurement type Inch Metric.

Latest Posts. The Different Types of Boring Tools. Oct 28, Boring Tools. Your name. About text formats. Solve this simple math problem and enter the result. Leave this field blank. Related Blogs. The samples of the soil are recovered at regular intervals or whenever there is a change in strata for conducting tests in laboratory for identification of soils and establishing properties of the sub-soil strata at various depths.

For test boring over 3 meter in depth, this method can be conveniently used. In this method a hollow steel pipe known as casing pipe or drive pipe is driven into the ground for a certain depth.

Then a pipe usually known as water jet pipe or wash pipe, which is shorter in diameter, is lowered into the casing pipe. At its upper end, the wash pipe is connected to water supply system while the lower end of the pipe is contracted so as to produce jet action. Water under considerable pressure is forced down the wash pipe. The hydraulic pressure displaces the material immediately below the pipe and the slurry thus formed is forced up through the annular space between the two pipes.

The slurry is collected and samples of material encountered are obtained by settlement. In this process the particles of finer material like clay, loam etc. Moreover, the exact position of a material in the formation cannot be easily be located. However the change of stratification can be guessed from the rate of progress of driving the casing pipe as well as the color of slurry flowing out. Yet the results obtained by wash boring process give fairly good information about the nature of the sub-soil strata.

This method can be adopted in soft to stiff cohesive soils and fine sand.