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Showing 1 to 6 of 6 for “"pilot-hole"”.
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Effect of Cracking on Lag Bolt Performance
… were specific gravity, lag screw diameter, and pilot hole diameter. Two species of wood, Douglas-fir and spruce-pine-fir, three lag screws diameters, and three pilot hole diameters for each species of wood were implemented. Models were developed to predict lag screw connection capacity and 5% …
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Design and implementation of an automated gamma probe for jet boring uranium mining.
… radiometric data in Jet Boring System (JBS) pilot holes at the Cigar Lake uranium mine is presented. Variant design is used to design, develop, test and implement the detector's hardware, fi rmware and software. The battery powered detector is attached inside a JBS drill rod to collect …
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Design of a Pneumatic Tool for Manual Drilling Operations in Confined Spaces
… The purpose of this device is to back-drill pilot holes inside a commercial airplane wing. It is lightweight, and a “locator pin” enables the operator to align the drill over a pilot hole. A suction pad stabilizes the system, and an air motor and flexible drive shaft power the drill. Two …
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Economic consequences of hole deviations in mining operations
… In mining methods involving the use of long holes, extra costs are incurred as a result of consequences associated with hole deviations.The consequences include build-ups, hang-ups and poor rock fragmentation.These consequences usually lead to extra drilling, loss of drill strings, ore …
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Economic consequences of hole deviations in mining operations
… In mining methods involving the use of long holes, extra costs are incurred as a result of consequences associated with hole deviations.The consequences include build-ups, hang-ups and poor rock fragmentation.These consequences usually lead to extra drilling, loss of drill strings, ore …
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An In-Vitro Study Evaluating the Fracture Resistance and Insertion Torque of Self-Drilling Mini-Implants Upon Insertion Into Synthetic High Density Mandibular Bone.
Introduction: Self-drilling mini-implants are commonly used in orthodontics, but there is little information regarding their fracture resistance in areas of high density bone without pre-drilling. Purpose: To determine the peak fracture torques of six commonly used self-drilling mini-implants, and …