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 |
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| Item Status: | Live Archive |
| Faculty/School / Institute/Centre: | No Faculty |
| Faculty/School / Institute/Centre: | 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 (2008): | 09 Engineering > 0913 Mechanical Engineering > 091399 Mechanical Engineering not elsewhere classified |
| Fields of Research (2020): | 40 ENGINEERING > 4017 Mechanical engineering > 401799 Mechanical engineering not elsewhere classified |
| URI: | http://eprints.usq.edu.au/id/eprint/32711 |
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