The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 1985
Filed:
Sep. 16, 1982
David R McMurtry, Wotton-under-Edge, GB;
Renishaw Electrical Limited, Wotton-under-Edge, GB;
Abstract
The machine tool is a machining center having an angularly positionable tool spindle, a work table movable relative to the spindle, and a surface-sensing probe mountable on the spindle for measuring dimensions or positions on a work piece situated on the table. The probe senses a surface when the latter lies a small distance ('the probe offset') away from the spindle axis. The method comprises providing on the workpiece a bore 24 defining opposite test surfaces -DX and +DX. The mid-point between the test surfaces has a known nominal position but an unknown actual position. The method further comprises operating the machine in a specified way to measure the test surfaces, the operation including rotating the spindle through 180.degree. between certain of the measuring operations. The measurements are then used for computing the probe offsets and the distance ('the work offset') between said nominal and actual positions.