Drilling apparatus and methods

Patent


Brett, Peter, Taylor, Robin, Proops, David, Coulson, Chris and Griffiths, Mansel V.. 2013. Drilling apparatus and methods. US8463421 B2
Title

Drilling apparatus and methods

TypePatent
AuthorsBrett, Peter (Author), Taylor, Robin (Author), Proops, David (Author), Coulson, Chris (Author) and Griffiths, Mansel V. (Author)
Patent/Trademark ApplicantAston University, United Kingdom
Patent/Trademark NumberUS8463421 B2
Countries in Which Patented/TrademarkedUnited States of America
Number of Pages12
Year2013
Web Address (URL)http://www.google.com/patents/US8463421
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.

Keywordsdrilling apparatus; drill bit
ANZSRC Field of Research 2020401799. Mechanical engineering not elsewhere classified
Byline AffiliationsAston University, United Kingdom
Institution of OriginUniversity of Southern Queensland
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