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:
Jun. 14, 1988
Filed:
Nov. 06, 1986
Richard W Caddell, La Porte County, IN (US);
Kearney & Trecker Corporation, West Allis, WI (US);
Abstract
A tool measuring apparatus for a machine tool is provided with a plunger (16) mounted to move along an axis (22) to vary the spacing between the end of the plunger and an inductive element (26) of an inductive displacement measuring device (24). Device (24) generates a signal V.sub.y which varies as a function of the spacing between the plunger (16) and device (24). Spindle (14), engaging a tool (12), is moved to a position M located a known distance from inductive element (26). As the spindle is moved to position M, tool (12) engages plunger 16 and moves the plunger to decrease the spacing between the plunger and the element (26) to a value S.sub.3, corresponding to an unknown length d of tool (12). Levels of V.sub.y corresponding to spacing S.sub.3 and to S.sub.2, representing a known nominal value N of tool length, are coupled to a processor 32 and a control 30 to determine tool offset e, i.e., the difference between actual length d and nominal length N.