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. 11, 2013
Filed:
Jun. 22, 2007
Peter Brett, Birmingham, GB;
Robin Taylor, Birmingham, GB;
David Proops, Birmingham, GB;
Chris Coulson, Birmingham, GB;
Mansel V. Griffiths, Bristol, GB;
Peter Brett, Birmingham, GB;
Robin Taylor, Birmingham, GB;
David Proops, Birmingham, GB;
Chris Coulson, Birmingham, GB;
Mansel V. Griffiths, Bristol, GB;
Aston University, Birmingham, GB;
Abstract
The present invention provides a method of drilling a hole in a workpiece in order to control breakthrough of the workpiece comprising the steps of: a) initiating contact between a drill bit of a drill unit and the workpiece; b) operating the drill unit to rotate the drill bit to drill the workpiece; c) during drilling of the workpiece measuring the force, F and torque, T, experienced by the drill bit; d) calculating a variable F', based on the measured force, F, representing the rate of change of F; e) calculating a variable, T′ based on the measured torque, T, representing the rate of change of T; f) calculating a variable F″ representing the rate of change of F′; g) calculating a variable T″ representing the rate of change of T″; h) detecting the onset of breakout of the workpiece by use of the variables F′, F″, T′ and T″; i) thereby controlling the speed of rotation of the drill bit during breakthrough of the workpiece to control the degree of breakout of the drill bit from the workpiece. A drilling system is also disclosed.