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1. WO2005028996 - METHOD OF ERROR COMPENSATION IN A COORDINATE MEASURING MACHINE

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Publication Number WO/2005/028996
Publication Date 31.03.2005
International Application No. PCT/GB2004/004039
International Filing Date 22.09.2004
IPC
G01B 21/04 2006.1
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
21Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the other groups of this subclass
02for measuring length, width, or thickness
04by measuring coordinates of points
CPC
G01B 21/042
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
21Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups
02for measuring length, width, or thickness
04by measuring coordinates of points
042Calibration or calibration artifacts
G01B 21/045
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
21Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups
02for measuring length, width, or thickness
04by measuring coordinates of points
045Correction of measurements
G01B 3/30
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
3Instruments as specified in the subgroups and characterised by the use of mechanical measuring means
30Bars, blocks, or strips in which the distance between a pair of faces is fixed, although it may be preadjustable, e.g. end measure, feeler strip
G01B 5/012
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
5Measuring arrangements characterised by the use of mechanical means
004for measuring coordinates of points
008using coordinate measuring machines
012Contact-making feeler heads therefor
Applicants
  • RENISHAW PLC [GB]/[GB] (AllExceptUS)
  • McMURTRY, David, Roberts [GB]/[GB] (UsOnly)
  • McFARLAND, Geoffrey [GB]/[GB] (UsOnly)
  • NAI, Kenneth, Cheng-Hoe [SG]/[GB] (UsOnly)
  • TRULL, Stephen, James [GB]/[GB] (UsOnly)
  • WESTON, Nicholas, John [GB]/[GB] (UsOnly)
Inventors
  • McMURTRY, David, Roberts
  • McFARLAND, Geoffrey
  • NAI, Kenneth, Cheng-Hoe
  • TRULL, Stephen, James
  • WESTON, Nicholas, John
Agents
  • JACKSON, John, Timothy
Priority Data
0322115.722.09.2003GB
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD OF ERROR COMPENSATION IN A COORDINATE MEASURING MACHINE
(FR) PROCEDE DE COMPENSATION D'ERREUR DANS UNE MACHINE DE MESURE DE COORDONNEES
front page image
Abstract
(EN) A method of calibrating an articulating probe head comprising the steps of measuring an artefact of known dimensions with the workpiece sensing probe mounted on the articulating probe head, in which the articulating probe head is unlocked. An error functional map is generated corresponding to the difference between the measured and known dimensions of the artefact. Subsequent workpieces are measured with the articulating probe head unlocked and the corresponding correction applied. The true dimensions of the artefact may be determined by measuring it with a probe mounted on an articulating probe head in which the axes of the articulating probe head are locked. A mechanical lock is provided to lock the axes of the articulating probe head.
(FR) La présente invention concerne un procédé pour étalonner une tête de sonde articulée. Ce procédé consiste à mesurer un artefact de dimensions connues avec la sonde de détection de pièce montée sur la tête de sonde articulée dans laquelle la tête de sonde articulée n'est pas bloquée. Une carte fonctionnelle d'erreurs correspondant à la différence entre les dimensions mesurées et les dimensions connues de artefact est établie. Les pièces ultérieures sont mesurées avec la tête de sonde articulée non bloquée et la correction correspondante est appliquée. Les dimensions réelles de artefact peuvent être déterminées en les mesurant avec une sonde montée sur une tête de sonde articulée dans laquelle les axes sont bloqués. Un verrou mécanique permet de bloquer les axes de cette tête de sonde articulée.
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