A down-the-hole drill, usually called DTH Drilling Rig, is basically a mini jackhammer screwed on the bottom of a drill string. The speedy hammer activity breaks hard stone into little flakes and dust and can be dismissed evident by the air exhaust in the DTH hammer.
[pdf] Core drilling is a method of drilling that involves using a special drill bit and drill to remove a cylindrical core of material. This technique is often used in construction and other industries to create holes.
[pdf] Our concrete core drilling equipment is designed to work with diamond core bits to core (remove cylinder of material) from concrete and stone. Diamond Tool Store carries a wide range of core drill stands, motors, and bits that are made to last and make the cut.
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