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pilot hole

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pilot hole [′pī·lət ‚hōl]
(design engineering)
In metal-forming operations, a prepunched hole in a metal strip into which the pilot component of the die enters in order to assure precise registration of the strip at each work station.
(engineering)
A small hole drilled ahead of a larger borehole.
(mechanical engineering)
A hole drilled in a piece of wood to serve as a guide for a nail or a screw or for drilling a larger hole.
pilot hole
A hole which serves as a guide for a nail or screw, or for drilling a larger-size hole.
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1990: Crews at work on the Channel Tunnel met for the first time when French workers drilled a pilot hole through to the British side of a service tunnel.
Onthisday by Coventry Evening Telegraph (England)
1990: Crews at work on the Channel Tunnel celebrated when they met for the first time after French workers drilled a pilot hole through to the British side of the maintenance tunnel - first of the three tunnels in the mammoth undertaking to make the breakthrough.
ON THIS DAY IN .. by Daily Post (Liverpool, England)
1990: Crews at work on the Channel Tunnel met for the first time when French workers drilled a pilot hole through to the British side of a service tunnel.
On this day by Huddersfield Daily Examiner (Huddersfield, England)
 
 
 
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