pilot drill bit
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Drill bit — For the fictional character, see Drill Bit (Transformers). For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. For the types used in drilling wells, see Well drilling. From top to bottom: Spade, lip and spur (brad point), masonry … Wikipedia
Pilot hole — A pilot hole is a smaller hole drilled into a material prior to a larger hole being drilled, widening the hole to the desired width. Drilling a pilot hole prevents a larger drill bit from slipping on the material a potential safety hazard, as… … Wikipedia
pilot hole — When using a large drill bit, it is sometimes hard for the drill to cut through the metal and do it evenly in a straight line. A pilot hole is first made with a small bit. Then, when you use the large bit, the drilling is much easier … Dictionary of automotive terms
pilot hole — noun A narrow hole drilled or punched into a surface, to facilitate the insertion of a wider screw, nail, drill bit, or other boring tool. During the sinking of the last 150 feet, a pilot hole was kept in advance, so as to prevent any unforeseen… … Wiktionary
pilot bit — noun a small bit that drills a first hole to guide a larger drill • Hypernyms: ↑bit … Useful english dictionary
Diamond drilling porcelain — Porcelain tiles are growing in popularity in both the domestic and commercial markets. Producers are now able to replicate a range of natural stones, finishes and designs but with the additional benefit of being durable, strong and easy to clean … Wikipedia
2010 Copiapó mining accident — Copiapó mining accident redirects here. For the 2006 accident in the Carola Agustina mine, see 2006 Copiapó mining accident. 2010 Copiapó mining accident Rescue efforts at San José Mine near Copiapó, Chile on 10 August 2010 Date … Wikipedia
Hole saw — Not to be confused with Core drill. A 52 mm (2.0 in) hole saw with pilot bit … Wikipedia
Directional boring — A small directional boring unit in action Directional boring, commonly called horizontal directional drilling or HDD, is a steerable trenchless method of installing underground pipes, conduits and cables in a shallow arc along a prescribed bore… … Wikipedia
Angel (Neon Genesis Evangelion) — In the anime and manga Neon Genesis Evangelion , Angels are beings which attack Tokyo 3 over the course of the story. Description and informationAll but one of the Angels are the progeny of Adam, itself the First Angel . Extras: Eva Glossary .… … Wikipedia
Raise borer — A raise borer is a machine used in mining for drilling a circular hole or shaft between two levels of a mine. The borer is set up on the upper level of the two levels to be connected. A small diameter hole is bored to the level required, using a… … Wikipedia
