METHOD AND TOOL FOR DRILLING SMALL-DIAMETER DEEP HOLE, AND FINISHING MACHINE HAVING THE TOOL

摘要

PURPOSE: To provide a drilling method and tool which can make a truely round and straight hole with high accuracy by boring or grinding. ;CONSTITUTION: At the entrance side of the hole A of a workpiece 52, a guide plate 53 is installed so that the axial centers of the hole A and the hole 53a of the guide plate 53 may almost coincide with each other, and then, after a cutting tool 2 and basins 4 and 5 are inserted to the hole 53a of the guide plate 53, a fluid is fed to the basins 4 and 5 so as to compose a static bearing between the basins 4 and 5, and the hole 53a of the guide plate 53. And then, the cutting tool 2 is advanced in the hole A of the workpiece 52, and a static bearing is composed between the hole A, and the basins 4 and 5, when the hole A is processed into the final form of processed hole.;COPYRIGHT: (C)1995,JPO