pilot hole


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pilot hole

- A small hole drilled or hammered for the insertion of a nail or screw, or for drilling a larger hole.
See also related terms for insertion.
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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.
1938: Orson Welles's radio adaptation of HG Wells's War Of The Worlds caused panic in the US by convincing many listeners that Martians had really 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.
Michels carefully employed critical drilling techniques and specialized fluid which not only allowed the pilot hole to intersect precisely on the ends near the middle of the crossing, but that also achieved full drilling fluid circulation nearly 100 percent of the time, which had previously never before been accomplished at these distances and in these ground conditions.
Construct Pilot Hole including disposal of cuttings and mud
13, a Ditch Witch[R] 40,000-pound pullback JT4020 AT drill unit launched the pilot hole from a set-up spot on the highway south of the creek.
Drive screws through each pilot hole to secure shelves.
Anchors designed for minimal bone removal during pilot hole creation
Since the last report, the 8 1/2" precautionary pilot hole previously drilled to 202mMDRT (metres Measured Depth below Rotary Table) was opened to 26", ahead of running and cementing 20" surface casing.
Drilling pilot holes - If you need to drill a large diameter hole many tradesmen advise a pilot hole first.
Also, with their method, called "down reaming," they drill a pilot hole of a much smaller diameter.
It descends 50 feet a day, first making a 13-inch pilot hole, which will then reportedly be widened to pull the men up in a cage one at a time.
Following the setting of 20" surface casing at about 100 meters, the well plan called for the drilling of an 8-1/2" pilot hole down to the 13-3/8" intermediate casing point.