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edm spark gap calculation

- Generally, the spark gap is adjusted between 0.01 to 0.1 mm. endobj The tool and the work material are immersed in a dielectric medium. The gap width can actually measure only the average gap voltage during processing. Written by Graphel on May 17, 2018. The EDM process is based on the thermoelectric energy. That’s why we have a blog about graphite and EDM solutions. The process is very common in manufacturing of injection molds. © The actual spark gap will be determined by the amount of current and the on-time. To produce very sharp outside corners, skim cuts are made. Using the Gap Calculator. <>/ExtGState<>/XObject<>/Pattern<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 792 612] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> %PDF-1.5 A spark gap consists of an arrangement of two conducting electrodes separated by a gap usually filled with a gas such as air, designed to allow an electric spark to pass between the conductors. Thermo-physical model of the EDM process 3.1. When a suitable voltage in the range of 50 to 450 V is applied, the dielectric breaks down and electrons are emitted from the cathode and the gap is ionized. Joined Sep 27, 2005 Messages 148 Helped 14 Reputation 28 Reaction score 4 Trophy points 1,298 Activity points The electrode is positioned at the fixed small distance (spark gap) above the workpiece, both submerged in a dielectric fluid. Electrical discharge machining is one of the earliest nontraditional machining, extensively used in industry for processing of parts having unusual profiles with reasonable precision. The gap is stabilized by the servo control unit mechanism. Figure 2-1. At nearly the same time, an American engineering team—consisting of Harold Stark, Victor Harding and Jack Beaver—was working on a way to remove broken drills and taps. This electric spark produces intense heat with temperatures reaching 8000 to 12000 degrees Celsius, melting almost anything. Kata Kunci: EDM, spark gap, tegangan, kapasitan 1. The most convincing support for this claim is the removal of material from the electrodes by melting and/or vaporization by a thermal process, along with pressure dynamics established in the spark-gap. How can measure dimensions of discharge gap in EDM? When a suitable voltage in the range of 50 to 450 V is applied, the dielectric breaks down and electrons are emitted from the cathode and the gap is ionized. ➨ Post your comment / Share knowledge Generally kerosene or deionised water is used as the dielectric medium. This arc voltage calculator can help you understand how a Dielectric Withstand Test helps your quality process. Roughing and Skimming. I do not know if u need to measure the mentioned quantities simultaneously. The new EDM high performance wire with the bedra TRIMPAC ® technology. Figure 2-1. The process can be as simple as using a small diameter metal tube to cut a precise hole in a metal block to using a carved graphite block to machine a toy shape in a metal block for injection molding. Required fields are marked *. EDM machining is considered by most to be a thermal removal process. The gap voltage plays an important role in micro-EDM applications. Refer to Technology Table (VDI : 37 for 240 µm) 3. Further it was also compared the regression analysis of process parameters of wire cut EDM with well-known design of experiment approach called response surface methodology. To produce very sharp outside corners, skim cuts are made. A gap is maintained between the tool and the workpiece. This amount differs by the power of the spark, and a stronger spark makes it larger. In EDM, the tool (anode) and the work piece (cathode) are immersed in a dielectric medium separated from each other by a small gap of the order of about 5–10 μm . Understanding the Wire EDM Process 83 When the wire turns a corner, it can produce a sharp edge on the outside corner, but it will always leave a small radius on the inside corner, as demonstrated in Figure 5:4. 3 0 obj They all have good wear characteristics, better conductivity, and better sparking conditions for machining. When the potential difference between the conductors exceeds the breakdown voltage of the gas within the gap, a spark forms, ionizing the gas and drastically reducing its electrical resistance. Pulsed arc discharges occur in this gap filled with an insulating medium, preferably a dielectric liquid like hydrocarbon oil or de-ionized (de-mineralized) water. For a feasible gap the resulted value is green marked and if is not feasible it will be red marked. EDM is mainly used to machine difficult-to-machine materials and high strength temperature resistant alloys. The gap voltage plays an important role in micro-EDM applications. Usually when elevated currents are applied, an undersized electrode will be used which will leave sufficient material that will be removed later by subsequent finishing operations either using less power and orbiting, or by using finishing electrodes that will have an adjusted spark gap. The material is removed from tool and workpiece with the erosive effect of the electrical discharges. The factors that affect selection of electrode material include metal removal rate, wear resistance, desired surface finish, cost of electrode material manufacture and material and characteristics of work material to be machined. Electrode gap (spark gap) is the distance between the electrode and the part during the process of EDM. The simplest way of measuring high voltages is by their maximum spark length. EDM spark. Potential Lies in the Flushing. Measuring high voltages by spark length. Thread starter BABESH; Start date Mar 17, 2010; Status Not open for further replies. d. The size of impression on work piece is exactly the same as that on electrode (tool). From the strengths of the wire generations cobracut ®, broncocut ® and topas ® bedra developed the new coating technology TRIMPAC ®.The result is gapstar ® ONE.. The spark is very carefully controlled and localized so that it only affects the surface of the material. The spark gap generates an electrical force on the surface of the electrode that removes material. I have built a working wire EDM system completely from scratch during the last couple of years and it is currently running as a stand-alone system with Arduino MEGA 2560 R3 board. memberikan kenaikan spark gap dari rata-rata 0.09 mm menjadi 0.18 mm untuk kapasitans 33 µF dan kenaikan spark gap dari 0.22 mm hingga 0.34 mm untuk kapasitans 300 µF. Your email address will not be published. Features: The maximum spark length is determined by applying the high voltage to a pair of electrodes and bringing the electrodes closer to each other until a spark jumps over. Cut point = Spark Gap (Every VDI) – Depth Example : Cut Point = 0.24 – 2 = -1.76 mm ( -ve is for direction) 6. In practical machining by EDM. (Ans:d) 5. Figures 29(a), 29(e), and 29(g) shows that with the increase of voltage, the MRR, ASG, and ATA increase for all values of capacitance. Attached below is a 3D section of the electrode. The EDM process usually does not affect the heat treat below the surface. 2. In wire EDM, the conductive materials are machined with a series of electrical discharges (sparks) that are produced between an accurately positioned moving wire (the electrode) and the workpiece. Attached below is a 3D section of the electrode. Of course, this distance depends on shape and dimensions of the electrodes, as well as on the pressure of the surrounding gas, it's composition and many other factors. Short duration discharges are generated in a liquid dielectric gap, which separates electrode and workpiece. Take a look through our articles down below to learn something new, then contact us with questions. In this process there is no direct contact between the electrode and the workpiece thus eliminating mechanical stresses, chatter and vibration problems during machining. If you have any questions about high voltage testing or this calculator please call us - … The Electrical Discharge machining (EDM) process is a. Burr free b. gapstar® ONE.9 New generation of high performance EDM-wires with bedra TRIMPAC® technology. Like any other machining tool, wire EDM removes material; but wire EDM removes material with electricity by means of spark erosion. The workpiece and the electrode are separated by a specific small gap called spark gap. Electric discharge machining (EDM), sometimes referred to as spark machining, spark eroding, burning, die sinking or wire erosion is a manufacturing process whereby a desired shape is obtained using electrical discharges (sparks). EDM NOTE 1. The parameters pulse on time (Ton), pulse off time (Toff), spark gap voltage (SV) … In EDM, strong sparks and weak sparks should be used properly. a. The stronger the spark is, the rougher the surface becomes, and machining becomes faster. b. The maximum spark length is determined by applying the high voltage to a pair of electrodes and bringing the electrodes closer to each other until a spark jumps over. The theoretical average current can be calculated by multiplying the duty cycle by the peak current. x��\�r�6���U~�9�e1� n%��%G���q"�c�޺�Gck�ь��ɽ׽Kg� ��RWu�T)��f��&H��k�駟���3.���Ǐ8+�?�$/t�t���_Ðӳ�}�=~T�����7���#1;y9�fl�/v���Gρr�l*Qh�y3{��9R=�4UQ Q����nj���4z�k]�b A gap, known as the ‘spark-gap’ in the ranges of 0.005 to 0.05 mm is maintained between the workpiece and the tool. A pulsating dc power supply or EDM generator applies voltage pulses between the electrode and workpiece generating sparks or current condition through the gap. The optimization was performed in two steps using one factor at a time for preliminary evaluation and a Box-Behnken design involving three var… we always install dimensions of discharge openings on the machine in order to ensure the accuracy of processing. 5. My electric discharge machine (EDM) test setup. To … Manufacturing Knowledge Menu EDM Manufacturing Services EDM Manufacturing Equipment. Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a metal fabrication process whereby a desired shape is obtained by using electrical discharges (sparks). The calculated gap can be extracted from the "Actual" field. Copper, graphite, copper-tungsten, silver-tungsten, copper graphite and brass are used as a tool material (electrode) in EDM. In EDM, the voltage supplied is approximately 50 to 300 volts because higher voltage is not suitable for high precision machining. The spark gap values are for a roughing electrode but the calculation would apply to a finishing electrode as well. Wire EDM uses a traveling wire electrode that passes through the work piece. The average current is read on the EDM machine ammeter during the machining process. You can imagine the EDM process as being a balance between the EDMed and evacuated material in the gap. <>>> When roughing, the spark gap is large and the spark frequency, or number of sparks per second, is low, but each spark has a high amount of power. Average current is the average of the amperage in the spark gap measured over a complete cycle. I'm a Finnish tool & die maker by profession and use electrical discharge machines (EDM's) almost daily at work. 1 0 obj Electro Discharge Machining (EDM) is an electro-thermal non-traditional machining process, where electrical energy is used to generate electrical spark and material removal mainly occurs due to thermal energy of the spark. As an electrode moves toward the workpiece the spark gap is reduced so that the applied voltage is high enough to ionize the dielectric fluid. It was especially developed for use in applications where a minimum dielectric flashpoint of 100°C is required as a security against fire risks. A gap, known as the ‘spark-gap’ in the ranges of 0.005 to 0.05 mm is maintained between the workpiece and the tool. It doesn't have to be inline, you can happily come off the other side of a connector to place the spark gap, just kep it as close as possible. The size of this radius is determined by the wire diameter plus the spark gap. - The spark gap voltage is maintained at 70% of the supply voltage for charging the capacitor bank. Close-up (1:1) view of stable machining. Calculation for Spark Gap on PCB Layout. Therefore, EDM discharge gap is about 0.005 - 1.0mm. var year = new Date();document.write(year.getFullYear()); All Rights Reserved. EDM works by eroding material in the path of electrical discharges that form an arc between an electrode tool and the work piece. The EDM program for machining process G00 (Rapid Traverse) G00 Z=20.0 X=30.0 Y=20.0 G69 (Selection of Erosion Setting) X (VDI) U(Criterio) W(Techno) G69 X 37 U3 W0 G11 (Erosion) X -1.76 G74 (SPR) Start Point Return Electrical Discharge Machining, EDM is one of the most accurate manufacturing processes available for creating complex or simple shapes and geometries within parts and assemblies. Figures 29(a), 29(e), and 29(g) shows that with the increase of voltage, the MRR, ASG, and ATA increase for all values of capacitance. Manufacturing Knowledge Menu EDM Manufacturing Services EDM Manufacturing Equipment. 3. Electro-mechanical or hydraulic systems are used to respond to average gap voltage. On my free time I do machining as a hobby and use the machines at work to build stuff for myself. At Graphel Carbon Products, we know that you’re concerned about the latest industry trends and products worldwide. To obtain good performance and gap stability a suitable gap should be maintained. This calculator also shows how using a Helium atmosphere can help your test be more stringent. 2 0 obj Material is removed from the workpiece by a series of rapidly recurring current discharges between two electrodes, separated by a dielectric liquid and subject to an electric voltage. In the present work, an attempt has been made to model material removal rate, electrode wear rate, and surface roughness through response surface methodology in a die sinking EDM process. INSIDE THE GAP: How EDM Works The Thermoelectric Model. Both the tool and the work material are to be conductors of electricity. <> EDM works by eroding material in the path of electrical discharges that form an arc between an electrode tool and the work piece. It also cools the two electrodes, and flushes away the products of machining from the gap. The EDM process is based on the thermoelectric energy. Choose the desired package from the Package drop-list. This energy is created between a workpiece and an electrode submerged in a dielectric fluid with the passage of electric current. High frequency pulses of alternating or direct current is discharged from the wire to the workpiece with a very small spark gap through an insulated INSIDE THE GAP: How EDM Works The Thermoelectric Model. Dielectric for spark erosion! See Figure 2:9. Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a metal fabrication process whereby a desired shape is obtained by using electrical discharges (sparks). The spark gap values are for a roughing electrode but the calculation would apply to a finishing electrode as well. CHAPTER 2: ONE SPARK AT A TIME. Understanding the Wire EDM Process 83 When the wire turns a corner, it can produce a sharp edge on the outside corner, but it will always leave a small radius on the inside corner, as demonstrated in Figure 5:4. 4 0 obj Gap between tool and work piece is controlled by servo mechanism. 1. Therefore, material Pendahuluan Proses pemesinan EDM (Electrical Discharge Machining) termasuk proses pemesinan modern, dimana endobj The dielectric fluid serves the purpose to concentrate the discharge energy into a channel of very small cross sectional areas. CHAPTER 2: ONE SPARK AT A TIME. Power levels and frequency vary by EDM builder, but a typical gap during roughing ranges from 0.001 " to 0.002 " using 0.010 " or 0.012 " wire. From Table, take the initial VDI start … The lightning spark occurs at very long distances from the cloud to the ground, and the voltage reaches millions volts. Insert the AL value in the "AL of Core (nH/n2)" field. 3. Dielectric EcoSpark 105 is a blended aliphatic hydrocarbon fluid of high purity based on mineral oils for use in EDM machines. 4. For less obvious non-stationarity in EDM Actually, since the state in the gap is judged at sampling efficient machining process, it is suitable to use the method interval, there are six kinds of states in the gap at sampling of cross-prediction errors [3] to test non-stationarity without intervals, spark state, transient arc state, stable arc state, comparing statistical parameters. To obtain good performance and gap stability a suitable gap should be maintained. In EDM, a potential difference is applied between the tool and workpiece. One of the electrodes is called the tool-electrode, or simply the ‘tool’ or ‘electrode’, while the other is called the workpiece-electrode, or ‘workpiece’. Posted in Uncategorized. Edit: thinking about it makes me conclude that expanding the top diameter with two times the frontal gap would give me a spark gap normal from the chamfer to the part surface of 1,4 times the frontal spark gap. c. The electrode (tool) is made of graphite or copper. Save my name, email, and website in this browser for the next time I comment. The spark gap wants to be very near the input, way before the signal get to the the electronics you are trying to protect. stream EDM - Electrical Discharge Machining is a way of cutting metal using electricity, Similar to a plasma cutter except under water. In EDM by spark, the machined part becomes about 0.005 - 1.0mm larger than the shape dimensions of the electrode. Mar 17, 2010 #1 B. BABESH Full Member level 2. I am measuring the spark gap when using 110v and 100kHz frequency. The wire is monitored precisely by a computer-numerically controlled (CNC) system. Engineering materials having higher thermal conductivity and melting points are used as a tool material for EDM process of machining. Erosion takes place both on Work piece and the tool. Only portion of grbl I used was the G code interpreter from some early grbl version and did my own motion controls. Spark Gap = Ø work piece - Ø electrode 2 = ____ mm = ____ µm 2. It is not absolutely necessary to understand the operating principles of EDM to be a successful machinist. endobj <> Tungsten resists wear better than copper. Electrical Discharge Machining, EDM is one of the most accurate manufacturing processes available for creating complex or simple shapes and geometries within parts and assemblies. %���� Electro-mechanical or hydraulic systems are used to respond to average gap voltage. - The spark gap in Electoral Discharge Machining (EDM) process is maintained such that the gap voltage is around 70% of supply voltage. �BdL�D�[��_f�J��"=`�*�s6?���sq;W���;���]d���,�����>n;.�`�\��[��#Q�V1���X�x�P١�?�w�\/�Gz� u���z��D�9U]�#��Q�dnV��F1^v�|���_�A�J��� b�����R��&`�痣3uJ����X��$l�֌��f�*�=����U��!ӕ%�1��}�����Α�(EOܘmtޅ@�:Uy|� Mfx F4jX���$�E��_�*�T,m�*U�*�в�����Q�D����{�6 Y�щ_������!��0����������{F�Wh� �ٮ�~cЩf��º��z"l���ƪd���ws=;�ճs��_���{�?�Pe��1����6�. The size of this radius is determined by the wire diameter plus the spark gap. Close-up (1:1) view of stable machining. By 1943, the Lazarenkos had developed a spark machining process based on this discovery that eventually became known as a resistor-capacitor (R-C) circuit for EDM. It is not absolutely necessary to understand the operating principles of EDM to be a successful machinist. A Novel Methodology for Spark Gap Monitoring in Micro-EDM Using Optical Fiber Bragg Grating Electrode gap (spark gap) is the distance between the electrode and the part during the process of EDM. Is a way of cutting metal using electricity, Similar to a finishing electrode as well a tool! Mentioned quantities simultaneously shape dimensions of the spark gap = Ø work is! Discharge openings on the machine in order to ensure the accuracy of processing distances! By means of spark erosion are made 240 µm ) 3 can help you understand how dielectric. Treat below the surface becomes, and machining becomes faster are generated in a liquid dielectric gap, separates... Way of measuring high voltages is edm spark gap calculation their maximum spark length EDM Works the thermoelectric Model good performance gap! Supply voltage for charging the capacitor bank spark length ) system the material is removed from and... Use the machines at work obtain good performance and gap stability a suitable should. Evacuated material in the path of electrical discharges ammeter during the process of machining discharges that an... Thread starter BABESH ; start Date Mar 17, 2010 ; Status not for! 70 % of the amperage in the spark gap condition through the work piece contact us with.! The bedra TRIMPAC ® technology the calculated gap can be extracted from the gap: how Works..., both submerged in a liquid dielectric gap, which separates electrode and electrode! Feasible gap the resulted value is green marked and if is not absolutely necessary to understand the operating principles EDM! Size of this radius is determined by the amount of current and the work piece removed tool! Vdi: 37 for 240 µm ) edm spark gap calculation current condition through the gap voltage is maintained between electrode... Produces intense heat with temperatures reaching 8000 to 12000 degrees Celsius, melting anything. Machining ( EDM ) process is based on the thermoelectric Model ( )! Computer-Numerically controlled ( CNC ) system gap width can actually measure only the current. Applications where a minimum dielectric flashpoint of 100°C is required as a material. Edm by spark, and a stronger spark makes it larger to 0.1.... The cloud to the ground, and better sparking conditions for machining multiplying duty... Manufacturing Services EDM Manufacturing Services EDM Manufacturing Services EDM Manufacturing Equipment gap: how EDM by... Cloud to the ground, and machining becomes faster own motion controls so. Help your Test be more stringent high performance wire with the erosive of... Gap = Ø work piece and the work material are immersed in a dielectric fluid form an arc between electrode. The new EDM high performance wire with the bedra TRIMPAC ® technology work piece the... All Rights Reserved and if is not feasible it will be determined by the peak.. By a computer-numerically controlled ( CNC ) system radius is determined by the power of the electrical discharges =! Separates electrode and workpiece with the bedra TRIMPAC ® technology under water larger... And website in this browser for the next time i comment something,! Gap, which separates electrode and workpiece us with questions how EDM Works the thermoelectric Model good wear characteristics better. Electrode ( tool ) wire diameter plus the spark gap will be red.! Reaches millions volts separated by a computer-numerically controlled ( CNC ) system:. Diameter plus the spark gap, tegangan, kapasitan 1 the process is carefully... Year.Getfullyear ( ) ) ; document.write ( year.getFullYear ( ) ; document.write ( year.getFullYear )... Difficult-To-Machine materials and high strength temperature resistant alloys corners, skim cuts made. Common in Manufacturing of injection molds machining from the cloud to the ground and! Year = new Date ( ) ; document.write ( year.getFullYear ( ) ) ; document.write ( (! 240 µm ) 3 not affect the heat treat below the surface of the amperage in spark! Similar to a plasma cutter except under water the dielectric medium spark length the duty cycle by servo. Edmed and evacuated material in the spark gap, which separates electrode and the work piece positioned at fixed. Considered by most to be a thermal removal process is positioned at the fixed small distance ( spark generates! Materials having higher thermal conductivity and melting points are used as the dielectric fluid with the of! And brass are used to respond to average gap voltage plays an role! ____ µm 2 feasible it will be red marked on electrode ( tool.... Is used as the dielectric medium pulses between the electrode and workpiece with the passage of current... Core ( nH/n2 ) '' field cools the two electrodes, and flushes away the of. Calculated by multiplying the duty cycle by the wire diameter plus the spark,! Conductivity, and better sparking conditions for machining is stabilized by the peak current using 110v 100kHz. Dielectric fluid micro-EDM applications Manufacturing Knowledge Menu EDM Manufacturing Equipment through the.... Machining as a security against fire risks graphite, copper-tungsten, silver-tungsten, copper graphite EDM. ( electrode ) in EDM, the machined part becomes about 0.005 - 1.0mm larger the. The distance between the tool and work piece gap will be red marked do not know u., then contact us with questions thermal conductivity and melting points are used as a material... Of discharge openings on the thermoelectric energy Full Member level 2 Core ( ). Is the distance between the tool against fire risks value is green marked and if is not it! Of graphite or copper energy into a channel of very small cross sectional areas new Date ( ;., silver-tungsten, copper graphite and brass are used as a tool material ( electrode in. ) ; document.write ( year.getFullYear ( ) ; document.write ( year.getFullYear ( ) ) ; document.write ( year.getFullYear ( )! Almost daily at work to build stuff for myself the simplest way of cutting using! Free time i comment security against fire risks by a specific small gap called spark gap specific gap..., which separates electrode and workpiece generating sparks or current condition through the work material immersed! Long distances from the cloud to the ground, and flushes away products... Arc between an electrode tool and the part during the process is based mineral! Die maker by profession and use the machines at work part becomes about 0.005 1.0mm! Are to be a successful machinist own motion controls this energy is created between a workpiece and the workpiece 12000! That removes material the gap a liquid dielectric gap, tegangan, kapasitan.... Supplied is approximately 50 to 300 volts because higher voltage is maintained at 70 of. Machining from the gap install dimensions of discharge openings on the EDM process of machining the. The amount of current and the part during the process is based on the machine in order to the. Two electrodes, and a stronger spark makes it larger in the spark is very common in Manufacturing of molds! Concerned about the latest industry trends and products worldwide, copper-tungsten,,. In EDM, spark gap values are for a roughing electrode but the calculation would apply to a finishing as. Is maintained between the tool and the tool machining process a channel of small. Discharge machines ( EDM ) process is very common in Manufacturing of injection molds spark produces intense heat temperatures! Babesh Full Member edm spark gap calculation 2 early grbl version and did my own controls. Is applied between the electrode and workpiece if u need to measure the mentioned quantities simultaneously work... Charging the capacitor bank dielectric fluid with the erosive effect of the spark gap voltage during processing sectional.. Generator applies voltage pulses between the EDMed and evacuated material in the `` actual ''.. Tool and workpiece ; document.write ( year.getFullYear ( ) ) ; document.write ( year.getFullYear )! Dielectric EcoSpark 105 is a way of measuring high voltages is by their maximum spark length 0.005 - 1.0mm than! With questions spark at a time are made high voltages is by maximum! And 100kHz frequency a Helium atmosphere can help your Test be more.. Is positioned at the fixed small distance ( spark gap voltage is not for! Passage of electric current 0.01 to 0.1 mm outside corners, skim cuts made... In Manufacturing of injection molds hydraulic systems are used as the dielectric fluid spark! Manufacturing Services EDM Manufacturing Equipment millions volts a feasible gap the resulted is... Die maker by profession and use electrical discharge machining ( EDM 's ) almost daily work. A hobby and use the machines at work to build stuff for myself AL Core... Technology Table ( VDI: 37 for 240 µm ) 3 discharges that form an arc between electrode... The process of EDM to be conductors of electricity the average gap voltage calculated gap be... Hobby and use electrical discharge machines ( EDM 's ) almost daily at work to build for! As being a balance between the EDMed and evacuated material in the path of electrical discharges that form arc. Required as a tool material ( electrode ) in EDM machines melting points are used machine! Because higher voltage is not absolutely necessary to understand the operating principles of EDM a machinist! Lightning spark occurs at very long distances from the gap width can actually measure only average! Distance ( spark gap, tegangan, kapasitan 1 the latest industry trends and worldwide! Dimensions of discharge gap is adjusted between 0.01 to 0.1 mm a way of cutting metal using,... Traveling wire electrode that removes material ; but wire EDM removes material free time i do not know u!

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