Patent ID: 7390148

Claim:
A method of boring a hole using a boring arrangement with a cutting insert, said boring arrangement comprising: a substantially cylindrical body having a longitudinal axis and an axially extending slot; a tool supporting member supported by said cylindrical body, said tool supporting member being movable with respect to said cylindrical body and adapted to retain a boring tool; a rotatable ring mounted on said cylindrical body and rotatable about the longitudinal axis of said cylindrical body; said rotatable ring being configured to permit adjustment movements of said boring tool of a distance of at least one micrometer in micrometer increments; and a displacement arrangement for moving said tool supporting member upon rotation of said ring, said displacement arrangement comprising a crossbeam being arranged in said slot of said cylindrical body such that said crossbeam engages with said ring; and an elongate rod coupled to said crossbeam and said tool supporting member such that rotation of said ring causes movement of said crossbeam within said slot and thus movement of said elongate rod and said tool supporting member; a cutting insert comprising: a face surface and first and second side faces disposed substantially transverse to said face surface; a primary cutting edge disposed between said face surface and said first side face; a secondary cutting edge disposed between said face surface and said second side face; a corner cutting edge being disposed between and to join said primary cutting edge and said secondary cutting edge; a chip breaking structure being disposed in an area of said face surface adjacent said corner cutting edge; said chip breaking structure comprising a chip breaker bottom base surface disposed to extend from said secondary cutting edge to said primary cutting edge; said chip breaking structure being configured to deflect chips away from the surface of a workpiece being cut during precision boring or cutting of the workpiece; and said chip breaking structure being configured to maximize the number of chips deflected away from the surface of a workpiece being cut during boring or cutting of the workpiece to minimize contact of chips with the surface of the workpiece and thus to minimize the roughness of the surface in the range of 0.1 micrometer to 0.001 micrometer; said method comprising the steps of: rotating said rotatable ring to move said crossbeam of said displacement arrangement a distance of at least one micrometer; cutting a workpiece with said cutting insert; deflecting with said chip breaking structure chips away from the surface of the workpiece to minimize contact of chips with the surface of the workpiece to minimize the roughness of the surface in the range of 0.1 micrometer to 0.001 micrometer; and terminating cutting of the workpiece.