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A Kelvin bridge, also called a Kelvin double bridge and in some countries a Thomson bridge, is a measuring instrument used to measure unknown electrical resistors below 1 ohm. It is specifically designed to measure resistors that are constructed as four terminal resistors.
Metalworking generally is divided into three categories: forming, cutting, and joining. Most metal cutting is done by high speed steel tools or carbide tools. [7] Each of these categories contains various processes. Prior to most operations, the metal must be marked out and/or measured, depending on the desired finished product.
Forging temperature is the temperature at which a metal becomes substantially more soft, but is lower than the melting temperature, such that it can be reshaped by forging. [1] Bringing a metal to its forging temperature allows the metal's shape to be changed by applying a relatively small force, without creating cracks.
Machining quality assurance staff use equipment such as CMMs, surface plates, height gauges, and micrometers to check conformance with the GD&T-defined geometry and dimensions defined by the engineering drawing or 3D model. The skills of these staff members and of the machinists themselves overlap; some inspectors have been, or could quickly ...
A thermal lance, thermic lance, oxygen lance, or burning bar is a tool that heats and melts steel in the presence of pressurized oxygen to create very high temperatures for cutting. It consists of a long steel tube packed with alloy steel rods, which serve as fuel; these are sometimes mixed with aluminum rods to increase the heat output.
Shielded metal arc cutting cuts the metal by melting it with the intense heat of the arc, without burning it with oxygen, which works better for carbon steel plate less than 6mm thick and for non-ferrous and corrosion resistant metals of any thickness. [1]: Ch. 1 Underwater shielded metal arc cutting is a simple process.
A cold work steel used for gauges, cutting tools, woodworking tools and knives. It can be hardened to 66 HRC, typically used at 61-63 HRC. Also sold as 1.2842 and 90MnCrV8. [9] O6: 1.45% C, 1.0% Mn, 1.0% Si, 0.3% Mo: A cold work graphitic steel with outstanding resistance to metal-to-metal sliding wear and galling.
Blanking is the operation of cutting flat shapes from sheet metal. The outer area of metal remaining after a blanking operation is generally discarded as waste. Size of blank or product is the size of the die & clearance is given on punch. It is a metal cutting operation. In blanking, metal obtained after cutting is not a scrap if it is usable.