The Kennametal solution is set-up similar to a typical guide pad reamer, but the guide pad, normally located at 180° to the cutting edge, has been rotated. The resulting design provides sufficient freedom to enter and exit the guide part.
In short, this geometry means the bar can be fed through raw bores on an eccentric path. Kennametal says the solution retains all the advantages of previous line boring products, such as precision bore creation and support on both ends of the tool, but requires no expensive lift functions, obstructive counter-bearings or critical mechanisms inside the tool. The company also adds that complete feed-in and feed-out moves can be done at increased feed rates on conventional machining centres.
