Patent ID: 6227940
Filing Date: 2001-05-08
Classification: B23Q,B24B,Y10S,Y10T

Abstract:
A machine tool, comprising:(a) a machine frame;(b) a worktable assembly slidably carried by said machine frame for reciprocal movement along a work axis defined by a rotational axis of headstock and tailstock means and which is configured to carry a workpiece whereby the workpiece is movable along said work axis;(c) a worktool assembly carried by said machine frame for reciprocal movement along a worktool axis at a predetermined angle with respect to said work axis and so as to intersect same with a worktool movable along said worktool axis;(d) a reference straight edge carried by said worktable assembly and having a reference surface;(e) reference sensing means carried by said machine frame for coaction with said reference straight edge reference surface, to measure reference spacing between said reference surface and said reference sensing means and to provide a reference output indicative of said reference spacing; and(f) control means to facilitate movement of said worktool towards and away from said work axis which is responsive to said reference output to further facilitate worktool movement towards said work axis, wherein(g) in order to avoid parallax errors said reference spacing is measured at a height above said worktable assembly which is commensurate with the height of said work axis.