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. 21, 1993
Filed:
Mar. 06, 1992
William V Smith, Tustin, CA (US);
Excellon Automation, Torrance, CA (US);
Abstract
A method of precisely calibrating a spindle position with respect to a drilling apparatus worktable. The drilling apparatus includes a control device, which calculates an expected relative position of the spindle and the worktable based upon predetermined information, and the controlled movement of the spindle relative to the worktable. The method includes positioning the spindle in a first position, empirically determining the position of the spindle with respect to the worktable in both a first and a second direction, and determining a 'correction factor' between the expected spindle position relative to the worktable at the first position and the empirically determined spindle position relative to the worktable in the first and second directions. Also, a calibration device, including a body defining an aperture and an opening spaced from the aperture, a first sensor measuring the position of an object in the aperture in a first direction, a second sensor measuring the position of an object in the aperture in a second direction different from the first direction, and a third sensor measuring the direction of an object in the opening in the first direction. The sensors may be differential pressure transducers. The device includes means for securing the device to a worktable to prevent movement of the device in the first and second directions.