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The objective piece, or the rock being reduced by the removal of flakes, is known as a core. [ 1 ] : 254, 258 Once the proper tool stone has been selected, a percussor or pressure flaker (e.g., an antler tine ) is used to direct a sharp blow, or apply sufficient force, respectively, to the surface of the stone, often on the edge of the piece.
In contrast to the production of core tools like handaxes, where cores themselves were the end product shaped and trimmed down by removal of flakes, in prepared-core technique large flakes are the product and the core is used to produce them. This shift made it faster and more resource-efficient, as multiple tools could be struck from a single ...
Truck-mounted core drill. A modern 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 used in metal are called annular cutters. Core drills used for concrete and hard rock generally use industrial diamond grit as the ...
The Schrader valve consists of a valve stem into which a valve core is threaded. The valve core is a poppet valve assisted by a spring. A small rubber seal located on the core keeps the fluid from escaping through the threads. Using the appropriate tools, a faulty valve core can be immediately extracted from the valve stem and replaced with a ...
In archaeology, a lithic core is a distinctive artifact that results from the practice of lithic reduction. [ 1 ] [ 2 ] In this sense, a core is the scarred nucleus resulting from the detachment of one or more flakes from a lump of source material or tool stone , usually by using a hard hammer precursor such as a hammerstone .
An added benefit is that hollow core can be formed if the gas is introduced via holes in the core surface which cause only the surface of the core to harden; the remaining sand is then just dumped out to be used again. [4] For example, a cold-box sand casting core binder is sodium silicate which hardens on exposure to carbon dioxide. [5]