Core Drill
Core drill
A core drill is a drill specifically designed to remove a cylinder of material, much like a hole saw. The material left inside the drill bit is referred to as the core.
Core drills are used for many applications, either where the core needs to be preserved or where drilling can be done more rapidly since much less material needs to be removed by using core drill than with a standard bit.
This is the reason that diamond-tipped core drill are commonly used in construction to create holes for pipes, manholes, and other large-diameter penetrations in concrete or stone.
Core drill are used frequently in mineral exploration where the coring may be several hundred to several thousand feet in length. The core samples are recovered and examined by geologists for mineral percentages and stratigraphic contact points.
This gives exploration companies the information necessary to begin or abandon mining operations in a particular area. From wikipedia, core drill.
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