size cutting tool
51agriculture, origins of — Introduction the active production of useful plants or animals in ecosystems that have been created by people. Agriculture has often been conceptualized narrowly, in terms of specific combinations of activities and organisms wet rice production… …
52Drilling — For other uses, see Drilling (disambiguation). Drilling is a cutting process that uses a drill bit to cut or enlarge a hole in solid materials. The drill bit is a multipoint, end cutting tool. It cuts by applying pressure and rotation to the… …
53Shaper — This article is about shapers designed for metal workpieces; for wood applications, see Wood shaper. : For a person who makes surfboards see Shaper (surfboard)A shaper is a machine tool used for shaping or surfacing metal and other materials.… …
54coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… …
55Surface grinding — is used to produce a smooth finish on flat surfaces. It is a widely used abrasive machining process in which a spinning wheel covered in rough particles (grinding wheel) cuts chips of metallic or non metallic substance from a workpiece, making a… …
56CNC — The abbreviation CNC stands for computer numerical control, and refers specifically to a computer controller that reads G code instructions and drives a machine tool, a powered mechanical device typically used to fabricate components by the… …
57Forge — For the process of shaping metal by localized compressive forces, see Forging. For other uses, see Forge (disambiguation). A blacksmith s coal forge …
58glacial landform — ▪ geology Introduction any product of flowing ice and meltwater. Such landforms are being produced today in glaciated areas, such as Greenland, Antarctica, and many of the world s higher mountain ranges. In addition, large expansions of present… …
59Cylindrical grinder — The cylindrical grinder is a type of grinding machine used to shape the outside of an object. The cylindrical grinder can work on a variety of shapes, however the object must have a central axis of rotation. This includes but is not limited to… …
60scissors — /siz euhrz/, n. 1. (used with a sing. or pl. v.) a cutting instrument for paper, cloth, etc., consisting of two blades, each having a ring shaped handle, that are so pivoted together that their sharp edges work one against the other (often used… …
