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Boring Bar

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boring bar [′bȯr·iŋ ‚bär]
(mechanical engineering)
A rigid tool holder used to machine internal surfaces.

Boring Bar 

a device for boring holes; it is in the form of a cylindrical spindle with radially placed holes, either rectangular or round, in which individual or block cutters are fastened. Boring bars usually have a shaft that is fastened to the spindle of a boring machine. If the bar is long, the opposite end is held and guided by a sleeve on an end support. If the workpiece is fastened to a fixture rather than to the machine itself, the boring bar is directed by jig bushings, and the connection of the boring bar to the spindle is made with a coupling permitting self-alignment of boring-bar axis.

Various boring bars are designed to permit radial feed of the cutters for adjustment—that is, for compensation of the dimensional wear of the cutters—or the machining of indentations and grooves. Boring bars may be equipped with vibration dampers to reduce the level of vibrations arising in the cutting process.



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Additionally, there are new lever lock external holders and boring bars for HELITURN LD inserts, designed to accommodate the rake and edge configurations, facilitating high machining parameters, low cutting forces and reduced vibrations, particularly in internal ops.
The SL40 is a modular exchangeable head connection for boring bars in internal machining applications, while the SL70 are modular exchangeable blades for profile grooving with round inserts and the CoroCut grooving system for lathes, multi-task machines, and VTLs.
The 24-year-old on course to become Britain's first sports billionaire said recently: "I'm a boring bar person because if I am out I will only have a Coke or orange juice.
 
 
 
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