Drilling apparatus and methods

Aston University, United Kingdom (2013) Drilling apparatus and methods. .

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.


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Item Type: Patent
Item Status: Live Archive
Faculty / Department / School: No Faculty
Date Deposited: 12 Jul 2017 05:49
Last Modified: 13 Jul 2017 01:29
Uncontrolled Keywords: drilling apparatus; drill bit
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091399 Mechanical Engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/32711

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