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Topic: Electrical discharge machining

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	High speed electrical discharge machining by redressing high resolution graphite electrodes - Patent 4754115
		Electrical discharge machining has grown to be the preferred machining technique for a variety of production machining procedures, including the production of molds, dies, and complex three-dimensional workpieces, particularly those of difficult to machine materials.
		If electrical discharge machining parameters are chosen to keep electrode wear to the minimal levels attainable, often referred to in the art by the misnomer "zero wear conditions" in a collective conspiracy of wishful thinking, the electrode will still have one part wear for each one hundred parts of stock removal from the workpiece.
		Machining is effected by a combination of the mechanical action of abrasive grains projected against the surface of the workpiece and cavitation in the liquid.
	www.freepatentsonline.com /4754115.html (3716 words)

	What is EDM (Electrical Discharge Machining)?
		EDM is a machining method primarily used for hard metals or those that would be impossible to machine with traditional techniques.
		EDM or Electrical Discharge Machining, is especially well-suited for cutting intricate contours or delicate cavities that would be difficult to produce with a grinder, an end mill or other cutting tools.
		If you were to observe the wire EDM process under a microscope, you would discover that the wire itself does not actually touch the metal to be cut; the electrical discharges actually remove small amounts of material and allow the wire to be moved through the workpiece.
	www.wisegeek.com /what-is-edm.htm (553 words)

	EDM and electrical discharge machining including wire EDM, EDM machining, and wire EDM machining. (Site not responding. Last check: 2007-10-12)
		Electrical discharge machining, abbreviated as EDM, is a tooling method that uses electrical energy to shape and form metal parts.
		Electrical discharge machining is one of the most accurate manufacturing methods of working exceptionally hard metals and other materials that are difficult to machine cleanly with more conventional methods.
		EDM is a process of elimination that erodes or removes metal and material in the path of electrical discharges that form an arc between an electrode tool and the work piece until the desired part is attained.
	www.iqsdirectory.com /EDM (1987 words)

	Electrical Discharge Machining and Surface Alloying - The Process, Parameters and State of Play
		Electrical discharge machining (EDM) is a thermal process that involves melting and vaporisation of the workpiece electrode.
		The EDM process uses electrical discharges to remove material from the workpiece, with each spark producing a temperature of between 10,000-20,000°C. Consequently, the workpiece is subjected to a heat affected zone (HAZ) the top layer of which comprises recast material.
		Analysis of the machined surface revealed a 5-20 µm thick recast layer with some evidence of cracking and porosity Figure 3a shows the corresponding microhardness depth profile, while figure 3b illustrates the microhardness results from a test where all the parameters were the same except a lower open circuit voltage (125 V) was used.
	www.azom.com /details.asp?ArticleID=2082 (1676 words)

	The EDM Zone from Modern Machine Shop Online -- EDM Glossary
		An electrical impulse is used to indicate when a downward moving electrode approaches to within 0.0001 of contact with the surface of the workpiece, either to start a cut or to reposition the s electrode to resume cutting, as after dressing an electrode.
		A unit of electrical resistance equal to that of a conductor in which a current of one ampere is produced by a potential of one volt.
		It is a unit added to, or built into, an EDM machine which periodically causes the electrode to retract for a short period of time to aid in flushing a deep or blind cavity.
	www.mmsonline.com /edm/glossary/index.html (4434 words)

	Electrical Discharge Machining (EDM) -- Engineer's Handbook
		Electrical Discharge Machining (EDM), also known as spark erosion, employs electrical energy to remove metal from the workpiece without touching it.
		A pulsating high- frequency electric current is applied between the tool point and the workpiece, causing sparks to jump the gap and vaporize small areas of the workpiece.
		EDM permits machining shapes to tight accuracies without the internal stresses conventional machining often generates.
	www.engineershandbook.com /MfgMethods/edm.htm (239 words)

	Electrical Discharge Machining
		Die sinking EDM reproduces the shape of the tool used (electrode) in the part being machined, whereas in wire EDM a metal wire (electrode) is used to cut a programmed outline into the piece being machined" (p.
		"Electrical discharge machining (EDM) is a non-traditional manufacturing process based on removing material from a part by means of a series of repeated electrical discharges (created by electric pulse generators at short intervals) between a tool, called the electrode, and the part being machined in the presence of a dialectric fluid" (p.791).
		The main inconvenience with the die-sinking EDM is the electrical conductivity of the ceramic material.
	www.bsu.edu /web/blengle/Electrical_Disc_Machining.html (1596 words)

	Charmilles: What is EDM? (Site not responding. Last check: 2007-10-12)
		EDM - Electrical discharge machining is a machining process used mainly for producing dies, molds and certain metal parts.
		EDM can also be used to produce finished parts, such as cutting tools, parts cut from solids, and items of complex shape.
		The electrode is then mounted on an EDM machine, together with the workpiece in steel that is going to become the plastic injection mold.
	www.charmillesus.com /products/whatsedm/whatedm.cfm (165 words)

	!Electrical Discharge Machining, EDM, EDMTT, Electrical, Electric, EDM Machine, Wire EDM or WireCut EDM
		EDM is performed by repetition of micro crater produced by a single discharge and the machining forces are very small.
		EDM characteristics of GE monocrystal and B4C3, effects of electrical parameters on the material removal rate, the relative wear and the surface roughness of the workpiece are presented.
		Machining is possible using these methods, but due to problems such as volume to be machined, and speed, the scope to which they can be used is limited.
	www.edmtt.com /techpapers/materialstud/matstud.html (3504 words)

	Electrical Discharge Machining
		The basic Electrical Discharge Machining process has been around for over 50 years, but only recent advances in power supplies and computer control make it practical for wider application.
		For many companies, EDM is the only way to get a job done, because EDM can create burr-free, intricate and precise shapes in materials that cannot otherwise be machined.
		EDM is also applicable to soft or delicate materials since EDM does not use force to remove the material, and there is no risk of mechanical distortion or damage by cutting tools.
	tristate.apogee.net /et/eftfedm.asp (219 words)

	electrical discharge machining, edm electrodes, consumables, wire, sinker, small hole
		Electrical discharge machining (EDM) is a metal cutting process that uses electricity to "burn" away small bits of material until the desired dimensions are achieved.
		Electrical discharge machining is a very precise process that is capable of consistently holding tolerances of +/- 0.0002".
		We are ready, willing and able to assist you with all of your electrical discharge machining requirements and your EDM electrode needs.
	www.fmedm.com (221 words)

	Electrical discharge machining - Wikipedia, the free encyclopedia
		Electrical discharge machining (or EDM) is a machining method primarily used for hard metals or those that would be impossible to machine with traditional techniques.
		Sometimes referred to as spark machining or spark eroding, EDM is a nontraditional method of removing material by a series of rapidly recurring electric arcing discharges between an electrode (the cutting tool) and the work piece, in the presence of an energetic electric field.
		In ram EDM, a graphite or beryllium copper electrode is machined into the desired (negative) shape and fed into the workpiece on the end of a vertical ram.
	en.wikipedia.org /wiki/Electrical_discharge_machining (579 words)

	JobShop.com Technical Article - Electrical Discharge Machining: A Process for Hard Materials and Complex Design Adron ... (Site not responding. Last check: 2007-10-12)
		Known as ram or sinker EDM when it was introduced in the 1940s, the process was first employed primarily in the tool and die industry to remove broken taps and drills from dies being manufactured.
		Machining is accomplished by the action of rapidly occurring electrical discharges, or sparks, which erode small pieces of metal from the workpiece.
		A wire EDM machine, using a deionized water coolant, was operating unattended as it methodically machined an aerospace component.
	www.jobshop.com /techinfo/papers/edm3.shtml (2082 words)

	Electrical Discharge Machining - Industrial 101.com (Site not responding. Last check: 2007-10-12)
		Electrical discharge machining (EDM) is extensively used in the fine machining of complex forms and shapes in mold and die cutting, and fine hole drilling in injector cups, etc. The process can be used to machine fully-hardened metal components such as tool steel, which would not be possible using ordinary machining processes.
		EDM is a thermal process which removes and re-deposits material on the object that is being machined.
		In the EDM process, there is an electrical discharge that is formed between the surface of the object and the finishing tool which can create temperatures of between 10,000 and 20,000 degrees centigrade.
	www.industrial101.com /services/edm.aspx (430 words)

	EDM Machining, Wire, Small Hole, Drilling, Electrical Discharge Machining
		Electrical Discharge Machining or EDM is a highly accurate method of part production.
		With the Electrical Discharge Machining process we are capable of cutting all types of conductive materials, including exotic metals such as titanium, hastaloy, kovar, inconel, hard tool steels, carbide, etc.
		Contact Milco Wire EDM for all of your electrical discharge machining needs including, EDM drilling machines, Small Hole drilling machines, Sinker machines and Wire electrical discharge machining.
	www.milcowireedm.com (223 words)

	Electrical discharge machining (EDM) (Site not responding. Last check: 2007-10-12)
		EDM is the best choice for machining electric conductive materials, especially for holes of uncommon shapes.
		The EDM process stability is determined by the proportion of harmful discharges in the gap between a workpiece and an electrode, i.e.
		Crater to Pulse Classification for EDM with the Relative Electrode to the Workpiece Motion.
	www.fs.uni-lj.si /lat/edm/index.html (2849 words)

	An Electrical Discharge Machining and EDM Informational Page. Definitions and Terms.
		Electrical discharge machining and EDM including small hole EDM, wire EDM, EDM machinings, wire EDM machining, and plunge EDM.
		Discharge – The spark in the electrical discharge machining process.
		Surface Finish –; Comparative smoothness or coarseness of a machined workpiece surface, typically measured in min Ra in the U.S. Wear – Erosion the electrode undergoes during the EDM process.
	www.iqsdirectory.com /info/electricaldischargemachining/def.htm (676 words)

	A1 Advantage Electric Wire Discharge Machining (Site not responding. Last check: 2007-10-12)
		The process of wire electrical discharge machining (known as WEDM or wire EDM) offers many advantages which are unattainable using other methods.
		In many operations formerly performed by conventional manufacturing processes, the process of wire EDM is regularly less expensive, infinitely more accurate, and considerably time-saving.
		EDM Delivery - Production Wire EDM delivery is extremely fast since little or no tooling and fixturing is required in most cases.
	www.advantageedm.com (817 words)

	Wire EDM, electrical discharge machining - VW Broaching Service Inc.
		Wire electrical discharge machining is a method of cutting metals and other conductive materials, in which a traveling wire disintegrates material in a controlled manner.
		Wire electrical discharge machining uses an electrically charged thin brass wire, which is moved by computer control, close to, but not touching, the part to be cut.
		However, since wire EDM machines may run unattended, labor charges are kept to a minimum, and the same operator may run multiple machines.
	www.vwbroaching.com /wireedm.htm (805 words)

	EDM machining, electrical discharge machining services: Integrity EDM, Indiana
		Integrity EDM is an industry leader in all types of electrical discharge machining—from fast hole EDM to wire EDM to conventional EDM (also known as sinker EDM or sink EDM).
		In the electrical discharge machining industry, only flawlessly executed and rigorously tested end-products are acceptable.
		At Integrity EDM we perform electrical discharge machining on a variety of parts, from the largest land-based turbine components to the smallest aircraft units.
	www.integrityedm.com (146 words)

	Wire EDM - Precision Electrical Discharge Machining
		EDM hole drilling was originally used for putting in starter holes for the Wire EDM machines.
		We also use this machine to drill small holes in a variety of types of parts.
		Our machine is CNC controlled which allows us to burn hole patterns with close locational tolerances.
	www.wiretechedm.com /holes.htm (168 words)

	Machining - Wikipedia, the free encyclopedia
		Machining is an occupation or hobby or a class of material-working processes that involves using a power-driven machine tool, such as a lathe, milling machine or drill, to shape metal.
		The inferior finish found on the machined surface of a workpiece may be caused by insufficient clamping, cutting conditions or perhaps an incorrectly adjusted machine.
		Thorough measurement of a machined surface at each stage of its creation in a production process presents a challenge due to the variety of these characteristics, the spatial resolution required for sensing them relative to the total area of the part being machined, and the takt time available for accomplishing the measurement.
	en.wikipedia.org /wiki/Machining (715 words)

	Electrical Discharge Machining
		Electrical Discharge Machining involves bombarding a component with short bursts of electricity, with each burst creating a tiny crater which serves to define the shape of the component.
		ATP's Electrical Discharge Machining capabilities are continually evolving, and our current Electrical Discharge Machining centers rely on cutting-edge technology to consistently deliver the level of quality our clients have come to expect.
		For more information on American Turned Products' Electrical Discharge Machining capabilities or to set up an appointment with an ATP representative, e-mail us today or call (814) 474-4200.
	www.atpteam.com /precision-machining/electrical-discharge-machining.asp (220 words)

	Electrical Discharge Machining Services, Wire EDM Job Shop, Sinker EDM (Site not responding. Last check: 2007-10-12)
		How Electrical Discharge Machining EDM Service Small Hole Can Be the Keyhole To A New Future for your Precision Component.
		Electrical Discharge Machining (EDM) is a process in which a steel block (which will become the production mold) is submerged in an electrolyte solution.
		Precision Sinker EDM Electrical Discharge Machining - Prototypes to high volume EDM production parts, light tolerance molds-polish type finishes, cavities cut with fins as small as.008" to deep cavities made by unimaginable electrodes.
	www.twincityedm.com (471 words)

	Able Wire EDM - Electrical Discharge Machining
		Exotic alloys, polycrystalline, nitinol, and neodymium are just a few of the materials that are able to be EDMed at our facility.A complete CAD/CAM system is used for any engineering assistance you may need and for machine tool path generation.
		Inclusive of 5 axis machining, Micromachining, wire EDM, and 3 and 4 axis CNC machining.
		All of this is achieved via state of the art machines and a highly trained and motivated workforce.
	www.ableedm.com /index.html (375 words)

	Electrical Discharge Machining, Precision EDM Machining Job Shop, California(CA)
		Electrical Discharge Machining EDM machining & engineering assistance with complete CAD/CAM support is available at every level of your edm machined component or part development process to ensure the creation of a cost effective design.
		As your precision Electrical Discharge Machining service company in California your EDM design moves forward toward completion, our production personnel become involved to make sure they have a thorough understanding of your Electrical Discharge Machining EDM service, requirements, and specifications.
		EDM Capacities to 24" thick / 2500 lbs.
	www.wirecut-co.com (164 words)

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