Boring Machine

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boring machine

[′bȯr·iŋ mə′shēn]
(mechanical engineering)
A machine tool designed to machine internal work such as cylinders, holes in castings, and dies; types are horizontal, vertical, jig, and single.

Boring Machine


a metalcutting machine for drilling, countersinking and countersink reaming, reaming, boring, threading, machining cylindrical surfaces and faces, and milling. Universal horizontal boring machines are the most common type. For a number of operations, diamond boring machines and jig-boring machines are used.

Universal horizontal boring machines have a horizontal spindle mounted in a stock that moves up and down along a front support. There are three basic configurations: (1) machines for working small and medium-sized items, with spindle diameters up to 125 mm, a table that moves in two mutually perpendicular directions, and a stationary front support; (2) machines for working medium-sized and large items, with spindle diameters from 100 to 200 mm and a table and front support moving in mutually perpendicular directions; and (3) machines for working particularly large items, with spindle diameters from 125 to 320 mm, without a table, with a front support (column) that moves in one or two directions.

The spindle unit, which gives the machine its broad range of uses, consists of a hollow spindle that carries a faceplate with a cutter (the main motion) and an inner boring spindle driven in the axial direction (the feed motion). The performance abilities of boring machines are greatly increased by using spindle units having separate drives for a faceplate with a radial slide and for the inner spindle. The fitting of various attachments also widens the range of uses, permitting, for example, a combination of several changeover operations into one.

Trends in the development of boring machines include increasing the rigidity and resistance to vibration, reducing friction in moving parts, and using digital display, numerical control, and methods of remote observation and control of the working process, primarily in heavy-duty and special boring machines.


References in periodicals archive ?
The Global Shaft Boring Machine Industry Report 2014 is a professional and in-depth study on the current state of the shaft boring machine industry.
New Delhi, Apr 29 ( ANI ): The Delhi Metro Rail Corporation (DMRC) has tied up with the Tunnel Training Academy in Kuala Lumpur to train its engineers in the latest techniques and skills needed for doing underground tunnelling works using Tunnel Boring Machines (TBM).
Erdogan said the tunnel boring machine will advance 10 meters a day on average from the Asian side to the European one.
German group Herrenknecht has won a contract to supply 15 tunnel boring machines to Qatar Railways Company for work on the upcoming Doha metro project.
When the tunnel has been constructed and the boring machine removed, the 20in gas pipeline will be installed.
89 km of underground corridor was built and the DMRC had used 14 tunnel boring machines.
They are currently supplying the tunnel boring machines for Sound Transit's Capitol Hill Station to Pine Street segment and the Bay Tunnel near San Francisco, Calif.
Progress was slow as only explosives and pick axes were used, but from February 1883 a compressed air boring machine called the Beaumont Cutter took over.
Next up for the massive tunnel boring machine is getting disassembled and moving back to 92nd Street.
Dubai: The tunnel boring machine (TBM) used on Dubai Metro's Green Line has broken through the wall completing a 729-metre long tunnel from the Union Square underground station to Salahuddin Road.
Once all the bores are in line with the Micro Alignment Telescope, the telescope is left in place and the boring machine tool moves along the same line for machining.
The Tunnel Boring Machine (TBM), a 450-ton rock-chewing tool nicknamed "the Mole.