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:
Nov. 02, 1993
Filed:
Jun. 08, 1992
David R McMurtry, Wotton-Under-Edge, GB;
Renishaw Metrology Limited, Gloucestershire, GB;
Abstract
A core 4 is mounted on a machine tool for indexable rotation about an axis 2A, so as to bring respective cassettes 10 into position where they can be operated on by tools held in the machine tool spindle 6. The cassettes 10 may hold workpieces 14,14A for machining. After machining, the workpiece 14A is measured by a probe 20 held in the machine tool spindle 6. A pre-calibrated artifact 26 held on another cassette 10 is then indexed into the same position as previously occupied by the workpiece 14A, and comparative measurements are made of the artifact. The accuracy of these comparative measurements is increased because the artifact 26 resides on the machine tool in the same thermal environment as the workpiece during the machining, and because the measurements are made in the same position within the working volume of the machine tool, so that the same regions of the machine tool's measurement scales are utilized.