how electric discharge machine works

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Answer by shailendra kumar tiwari
Submitted on 12/3/2005
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EDM is sometimes called "spark machining" because it removes metal by producing a rapid series of repetitive electrical discharges. These electrical discharges are passed between an electrode and the piece of metal being machined. The small amount of material that is removed from the workpiece is flushed away with a continuously flowing fluid. The repetitive discharges create a set of successively deeper craters in the work piece until the final shape is produced. There are two primary EDM methods: ram EDM and wire EDM. The primary difference between the two involves the electrode that is used to perform the machining. In a typical ram EDM application, a graphite electrode is machined with traditional tools. The now specially-shaped electrode is connected to the power source, attached to a ram, and slowly fed into the workpiece. The entire machining operation is usually performed while submerged in a fluid bath. The fluid serves the following three purposes: flushes material away serves as a coolant to minimize the heat affected zone (thereby preventing potential damage to the workpiece) acts as a conductor for the current to pass between the electrode and the workpiece.

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Question by rm sonawane
Submitted on 7/18/2003
Related FAQ: List of Periodic Informational Postings, Part 1/20
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how electric discharge machine works

Answer by CORNELL
Submitted on 12/30/2003
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In the Electrical Discharge Machining process (EDM), metal is removed by generating high frequency sparks through a small gap filled with a dielectric fluid. This technique allows to machine complicated shapes in hard metals, including refractory alloys. A necessary condition for achieving a good surface finish is a well controlled gap between the electrode (tool) and the workpiece. The sparking gap ranges from about 10 to 100 microns, respectively for finish and roughing. The control problem is therefore the regulation of the gap, that is measured only indirectly by processing some secondary signals like ignition delays, average gap voltage, etc.

Answer by schaumann
Submitted on 4/23/2004
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what is the physical parameters of the process?

Answer by wawan
Submitted on 5/13/2004
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how equation relation frequency and temperature on electric discharge machine ?

Answer by jaybee
Submitted on 6/2/2004
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Im a student of enggneering and want through information on EDM. can you give me?

Answer by tyagi
Submitted on 5/5/2005
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Answer by nayak dharmendra
Submitted on 7/22/2005
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E.D.M is unconvation machine.In process of edm materil is vaporic by themal eletiric energy.Spark is ganarat bitween two condctor.Work pices mount on +ve pole and tool mount on -ve pole.So chargeable electron jump bitween 0.005mm gape with high kinetic energy.So tamrachar is ganarat up to 10000 to 12000c. and matel is vaporise

Answer by rohit
Submitted on 11/30/2005
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nothing

Answer by saiku88
Submitted on 1/19/2006
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Can EDM be used to machine micro holes on the surface of polymers? Pls help me with this. You can email me at saiku88@hotmail.com

Answer by nando
Submitted on 2/19/2006
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Is easy to produce revolution pieces with edm with inner details like threading holes, round and hexagon holes?

Answer by karthik
Submitted on 2/28/2006
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What are the relationships between different parameters of the WIRE CUT EDM and give the formulas of all those relationships?

Answer by taz
Submitted on 10/2/2006
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does anyone know of any video footage of the EDM proccess?

Answer by SaSa
Submitted on 12/24/2006
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why high frequency sparks have to be used??? why we can't use a DC current ??

Answer by Mahesh Buradkar
Submitted on 2/26/2007
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Answer by rahil
Submitted on 4/11/2007
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EDM is a process of metal removal by radiation of high velocity electrones on the workpiece,basic phenomenon envolved is "heating & eroding the surface".surface finish may vart from 5 micrones to 2 at most.

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