Hammer drill - A Hammer drill, also known as a rotary hammer or roto hammer, (see also rotary hammer drill) is a rotary drill with a hammering action. The fast hammer action breaks hard rock into small flakes and dust and is blown clear by … Wikipedia The down the hole drill is basically a mini jack hammer that screws on the bottom of a drill string. Drill scheme A drill or drill motor is a tool fitted with a cutting tool attachment or driving tool attachment, usually a drill bit or driver bit, used for drilling holes in various materials or… … Wikipediaĭown-the-hole drill - A Down The Hole Drill Called DTH in most drilling terms. From top to bottom: Spade, lip and spur (brad point), masonry … Wikipediaĭrill - For other uses, see Drill (disambiguation). For the types used in drilling wells, see Well drilling. For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. The term is loosely applied as the assembled collection of… … Wikipediaĭrill bit - For the fictional character, see Drill Bit (Transformers). Drill string - A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud pumps) and torque (via the kelly drive or top drive) to the drill bit.
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