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. 19, 1985
Filed:
Aug. 29, 1984
Richard K Davis, Charlottesville, VA (US);
Other;
Abstract
A reference post assembly (50) directly mounted on a numerically controlled machining system such as a lathe obviates the need for a datum ring including reference datum surfaces (42,44) and being conventionally provided on the external cylindrical surface and face of a chuck (36) which holds the workpiece (41) being machined. The reference post assembly (50) is comprised of an elongated reference post member (52) of selected cross section, i.e., square or round, which is resiliently mounted on the lathe in a known calibrated position with respect to the workpiece (41). The post (52) is ultrasonically vibrated in a longitudinal mode by one or more piezoelectric elements (54) coupled to an electrical signal oscillator (56). A frequency matched vibration sensor (72) in the form of an accelerometer is mounted on a machine tool carrying turret (26) and is adapted to sense the vibration imparted to the reference post when a machine tool (32) utilized as a touch probe is brought into contact with the reference post. The signal output of the accelerometer ( 72) is fed from the turret (26) by a rotating coupler (74) where it is conditioned and thereafter fed to a numerical control unit (46) and being used either for calibrating or gauging of parts in a machining operation.