Method of drilling a workpiece
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United States of America Patent
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N/A
Issued Date -
Mar 25, 2010
app pub date -
Sep 23, 2008
filing date -
Sep 23, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of operating a drill, or like cutting tool, facilitates efficient operation when drilling structural steel components, or like workpieces, which typically exhibit dimensional variations. Instead of controlling drill operations by the specific degree of advancement of the drill, the present invention contemplates that the drill is initially operated, while disengaged from the workpiece, to establish a no-load value of operation. Thereafter, the drill is advanced into the workpiece while it is operating to engage and penetrate the workpiece, while the load on the electric motor operating the drill is monitored. Advancement of the drill is discontinued, and the drill withdrawn, when the load on the drill drops to a value which is no more than the no-load value, plus a predetermined percentage thereof. Efficient operation is desirably promoted, since the drill can be efficiently repositioned when hole formation is complete.
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