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Exploration diamond drilling differs from other geological drilling (such as Reverse Circulation (RC) Drilling [3]) in that a solid core is extracted from depth, for examination on the surface. The key technology of the diamond drill is the actual diamond bit itself. [4] It is composed of industrial diamonds set into a soft metallic matrix.
For this reason, the effectiveness of a bit is often measured as drilling cost per foot of hole drilled, where a lower number indicates a higher performing bit. Note that the cost of the bit itself often is a rather small part of the overall drilling cost. Within the last couple of decades, a third design goal has become important in some cases.
As of August 2000, the U.S. Department of Energy claimed that nearly one-third of the total footage drilled worldwide is being drilled with PDC bits, with a claimed savings of nearly $100,000 per PDC bit as compared to roller-core bits.
Target was also called out in 2023 in a video allegedly revealing a television set that was ticketed with a sale price of $649.99 while also displaying the same price on a tag underneath.
While the above is a common use of center drill bits, it is a technically incorrect practice and should not be considered for production use. The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The ...