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Cutting speed may be defined as the rate at the workpiece surface, irrespective of the machining operation used. A cutting speed for mild steel of 100 ft/min is the same whether it is the speed of the cutter passing over the workpiece, such as in a turning operation, or the speed of the cutter moving past a workpiece, such as in a milling operation.
CNC Wire-cut EDM machine 1 Wire. 2 Electrical discharge erosion (Electric arc). 3 Electrical potential. 4 Workpiece. In wire electrical discharge machining (WEDM), also known as wire-cut EDM and wire cutting, [30] a thin single-strand metal wire, usually brass, is fed through the workpiece, submerged in a tank of dielectric fluid, typically ...
Electrical discharge machining (or EDM) is one of the most accurate manufacturing processes available for creating complex or simple shapes and geometries within parts and assemblies. A machining method typically used for hard metals, EDM makes it possible to work with metals for which traditional machining techniques are ineffective.
Speed, feed, and depth of cut are called the cutting conditions. [8] They form the three dimensions of the machining process, and for certain operations, their product can be used to obtain the material removal rate for the process: = where – the material removal rate in mm 3 /s, (in 3 /s), – the cutting speed in mm/s, (in/min), – the ...
Typical currents range from 0.1 amp per square mm to 5 amps per square mm. Thus, for a small plunge cut of a 1 by 1 mm tool with a slow cut, only 0.1 amps would be needed. However, for a higher feed rate over a larger area, more current would be used, just like any machining process—removing more material faster takes more power.
Incorrect speeds and feeds will cause damage to the tool, machine spindle, and even the product. The quickest and simplest way to find these numbers would be to use a calculator that can be found online. A formula can also be used to calculate the proper speeds and feeds for a material. These values can be found online or in Machinery's Handbook.
The speeds and feeds used are varied to suit a combination of variables. The speed at which the piece advances through the cutter is called feed rate , or just feed ; it is most often measured as distance per time (inches per minute [in/min or ipm] or millimeters per minute [mm/min]), although distance per revolution or per cutter tooth are ...
Surface feet per minute (SFPM or SFM) is the combination of a physical quantity (surface speed) and an imperial and American customary unit (feet per minute or FPM). It is defined as the number of linear feet that a location on a rotating component travels in one minute. Its most common use is in the measurement of cutting speed (surface speed ...