Patent ID: 6023325
Filing Date: 2000-02-08
Classification: B23Q

Abstract:
An arrangement for detecting elastic deformation of a shaft carried by a machine tool having a cutting bit, comprising an optical fibre section mounted in or on the shaft at a distance from a neutral bending axis of the shaft in the longitudinal direction of said shaft; wherein the optical fibre section, which follows the elastic deformation of the shaft, extends parallel with and at a constant distance from the neutral bending axis of said shaft so that elongation of the optical fibre section forms a measurement of bending of the shaft in an axial plane that includes the optical fibre section; wherein the optical fibre section has at least two longitudinally spaced partial reflection means; determining means connected to the optical fibre section for determining a change in distance between the partial reflection means in the optical fibre section, said change in distance providing a measurement of shaft curvature; and means for compensating for the influence of temperature on the change in distance between said partial reflection means, wherein deformation of the shaft is detected, or sensed, as a function of time; and in that at least one of a machine tool operating parameter is controlled by the sensed vibration so as to reduce said vibration to a level beneath a selected limit value.