Drilling apparatus and methods
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United States of America Patent
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Jun 11, 2013
Grant Date -
Jan 27, 2011
app pub date -
Jun 22, 2007
filing date -
Jun 22, 2006
priority date (Note) -
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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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