Patent ID: 6526364
Filing Date: 2003-02-25
Classification: B23Q,G01B

Abstract:
An apparatus for measuring roundness, comprising:a table for receiving a work mounted thereon, said work having a circumferential surface with a roundness to be measured; displacement detecting means for detecting displacements on said circumferential surface of said work; rotational driving means for rotationally driving either said table or said displacement detecting means such that said displacement detecting means detects said displacements along said circumferential surface of said work; eccentricity adjusting means for adjusting an eccentricity in said work, said eccentricity adjusting means including an eccentricity adjusting motor to move said table in a plane perpendicular to the rotational axis of said rotational driving means; tilt adjusting means for adjusting a tilt of said work to said rotational axis, said tilt adjusting means including a tilt adjusting motor to incline said table; computing means for calculating said eccentricity and tilt of said work from said displacements on said circumferential surface of said work detected by said displacement detecting means; eccentricity/tilt compensating means for driving said eccentricity adjusting motor and tilt adjusting motor on the basis of said eccentricity and tilt obtained by said computing means to compensate said eccentricity and tilt; and detecting means for detecting amounts of movements of said table in a plane perpendicular to said rotational axis and in a tilt direction about said rotational axis, wherein said eccentricity/tilt compensating means drives said eccentricity adjusting motor and tilt adjusting motor using said amounts of movements of said table detected by said detecting means as amounts of feedback.