Electrical Discharge Machining (EDM)

Highly accurate machining service of cutting metal to precise shapes using electricity

  • Tolerances down to ±0.0002″ (0.005mm)
  • Parts as Fast as 3 days
  • Aluminium, Steel, Copper, Polymers & More
Electrical discharge machining

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Why Choose Our Electrical Discharge Machining Service

Are you looking for machining options for die sinking, Extrusion, and calibrating tools? Then, EDM could be the best option for you. Our advanced Electrical Discharge Machining (EDM) technology enables us to create delicate and intricate cavities, precise cuts, and sections, including webs, fins, and tiny holes.

There are several reasons why you may choose our electrical discharge machining (EDM) service, including:

PrecisionEDM offers high levels of accuracy and precision, producing parts with consistent dimensions and tolerance.
Complex ShapesEDM is capable of producing complex and intricate shapes that would be difficult to achieve with other machining processes.
Hard MaterialsEDM can machine materials that are difficult to cut using other methods, such as high-hardness metals and alloys.
ConsistencyEDM provides consistent and accurate results, allowing for the high-volume production of identical parts.
Surface FinishEDM produces a smooth surface finish, reducing the need for secondary operations and improving overall part quality.
Efficient ProductionEDM is a fast and efficient process, reducing lead time and increasing productivity.
Experienced TeamOur team is highly experienced in EDM, ensuring that your parts will be produced to the highest standards.

Therefore, if you require any type of micro Machining on hardened and heat-treated workpieces, Prolean might be your finest partner. Send us your design so we will provide you with a quote.


How to Order parts?

Get a free quote from a real Engineer, Once we receive your design, Our engineer will review it and send you a quotation as fast as one hour.

Get One Hour Quote

Upload your design or send an email directly to our engineer and get your quotes within as fast as one hour

Start Production

Your parts will get made once your orders confirmed, besides, your will get real-time updated of the production status from our order tracking system

Receive Your Custom Part

After all parts pass qc inspection, they will be well packed from any transportation accidents. Then, your custom parts are delivered straight to your doorstep

CNC Machining Materials Options


Aluminum is a superior metal in terms of strength-to-weight ratio. It offers High Machinability, ductility, and thermal & electrical conductivity. Parts with aluminium also become highly resistant to corrosion.
Aluminum (MIC6)
Aluminum (2024)
Aluminum (5052)
Aluminum (5083)
Aluminum (6082)
Aluminum (6061-T6)
Aluminum (6063)
Aluminum (7075-T6)

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Golden shiny color, low friction, excellent Machinability, and high electrical & thermal conductivity. Brass can be easily machined and the best choice for low-friction applications.

Brass (360)

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It offers good strength, hardness, and excellent corrosion resistance with superior heat and thermal conductivity. It also has a very appealing aesthetic.
Copper 101
Copper 110

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40% more strength-to-weight ratio than steel, Excellent corrosion resistance, low thermal expansion, and biologically inert. These properties make it perfect for automotive, aerospace, and medical applications.
Grade 1 Titanium
Grade 2 Titanium
Grade 5 Titanium(TC4, Ti6Al4v)

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Alloy Steel
High mechanical strength, toughness, resistance to wear and fatigue, and sturdiness. In addition to carbon, other alloying elements can be added depending on the needed mechanical and physical qualities.
Alloy Steel 4130
Alloy Steel 4340
Steel (4140 Alloy)
Steel (1018 Low Carbon)
Tool Steel (A2)
Zinc-Galvanized Low-Carbon Steel
Carbon Steel (1045)

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Stainless Steel
High mechanical strength, Thermal, Wear, and Corrosion resistance. Stainless steel is low-cost and can be machined easily. Parts made from Stainless steel are durable and do not lose that strength over time.
Stainless Steel 201
Stainless Steel 301
Stainless Steel 303
Stainless Steel (304L)
Stainless Steel (316L)
Stainless Steel (410)
Stainless Steel (420)
Stainless Steel (440C)
Stainless Steel (17-4 PH)

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Cast iron
It offers three to five time’s higher compression strength than steel. Low notch sensitivity, Good Resistance to deformation, excellent anti-vibration, and consistent mechanical properties

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Excellent strength, extraordinary impact, and abrasion resistance with chemical inertness. ABS can be machined easily and is very easy to paint and glue.

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Acrylic is a lightweight, rigid thermoplastic with optical clarity. It is one of the superior alternatives to glass, offering excellent weather and chemical stability.

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High tensile strength, excellent Machinability, Stiffness, wear resistance, creep resistance, and low friction. Overall, Delrin is the ideal replacement for metal.
Delrin (30% Glass-Filled)

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Garolite G-10
High strength to weigh ratio, fire resistive, low thermal expansion coefficient, and water absorption coefficient are entirely free from corrosion risk. Garolite is perfect for insulating parts and electric circuit boards.

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FR-4 is a manufacturing material with strength almost equal to steel and lightweight. It is a perfect fit for making parts for the electrical marine industry since it is flame retardant, has a negligible water absorption coefficient, and is machinable.

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Polyethylene (PE)
Polyethylene is known for its malleable properties. It offers a high strength-to-weight ratio, impact strength, chemical inertness, temperature, and weather resistance.

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Mechanical properties include high resilience, tensile strength, and fatigue resistance. Nylon is a flexible manufacturing material that is highly resistant to abrasion, heat, chemicals, water, and oils.
Nylon (30% Glass-Filled)

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A versatile engineering material with high mechanical strength. It provides excellent thermal and chemical resistance. Parts from PEEKS are durable and can be operated at an extensive range of temperatures (up to 2600).
PEEK (30% Glass-Filled)

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Exceptional mechanical properties, including impact strength, toughness, Stiffness, and creep resistance. Because of its transparent nature, Polycarbonate (PC) is a lightweight alternative to glass.

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A low-cost material with good Stiffness, impact resistance, and chemical stability. PP also offers excellent wear resistance and elasticity.

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PPSU(Polyphenylene sulfone resins)
PPSU is used in various sectors because of its lightweight, high toughness, great impact resistance, high heat resistance, chemical stability, transparent color, and wide operating temperature range

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PPS (Polyphenylene)
The unique combination of Physical, mechanical, and chemical properties. Excellent strength, rigidity, fatigue endurance, creep resistance, chemical inertness, and a wide range of working temperatures for the fabricated parts make it a perfect choice for electrical applications with high operating temperatures.

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PTFE (Teflon)
High chemical inertness, thermal stability, electrical insulation, and corrosion resistance. Teflon is a low-friction substance that is perfect for making non-sticky and sliding parts for various industries.

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polyetherimide (PEI)
Semi-transparent, high strength, rigidity, thermal stability, chemical inertness, and dimensional stability. Parts made from PEI can work for an extended period without stress cracking.

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PMMA (Acrylic)
Transparent, lightweight, strong mechanical strength, hardness, thermal stability, and chemical inertness. Transparent nature makes it an excellent alternative to glass.

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Excellent Stiffness, flame resistance, weather resistance, dimensional stability, and chemical inertness. PVC is appropriate for pipelines, medical devices, outdoor appliances, and electrical insulation.

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CNC Machining Material Guide

Finishing Options

As the machined or deburring

The machined or deburring finish is the standard finish where unwanted attach chips are removed with deburring tools, and sharp edges are chamfered to smooth the surface (3.2 μm).

Bead Blasted

Bead blasting produces a matte texture, removing all the marks of machining tools. It applies to ABS, Aluminum, Brass, Stainless Steel, and Steel parts.


Anodizing involves adding an aluminum oxide coating to aluminum and its alloys. The layers, which come in various colors, increase strength and shield the surface from corrosion.

Powder coating

Powder coating is the electrostatically applying of dry powder to the surface. It produces a thin layer providing excellent resistance to wear, corrosion, and abrasion.


Physical rubbing of a metal surface to create a shiny surface is called a polishing surface finish. It increases the reflectivity and does not affect the dimensional stability of parts.


Brushing is achieved by applying an abrasive brush to the metal surface, which produces a unidirectional satin finish. And it is not recommended for highly corrosive materials.

Smooth machining

Smooth machining is done by controlling the machining process, such as feed rate & cutting speed. It minimizes the tool marks and risk of corrosion.


Black oxide finish reduces surface reflectivity and offers mild corrosion protection. It involves adding a thin layer of magnetite to the surface.


Electro-less Nickel Plating

A thin layer of Nickel is created on the surface from a nickel-containing solution without electrolysis. Electro-less nickel plating provides a shiny appearance, excellent hardness, abrasive, wear, and corrosion-resistance to the substrate material.


Provides excellent corrosion resistance property to the aluminum parts with greenish-gold color. It is the low-cost and quick surface finishing approach.


Electroplating increases the hardness of the steel &aluminum parts. It offers excellent corrosion, wears, and abrasion resistance.

Nickel plating

Make the parts super resistive to corrosion. It enhances mechanical strength, hardness, wear resistance, lubricity, and ductility. Nickel plating is applicable in different materials, including Steel, aluminum, copper, and brass.


Enhance the appearance and functionality of the parts. After Passivation, parts of Steel and its alloys become super resistive from corrosion.

Yellow Chromate conversion coating

A shiny appearance with goldish color provides excellent corrosion resistance. It is applied on the surface of aluminum, magnesium, and their alloys. A layer of chromate also enhances the conductivity of parts

PTFE (Teflon) Coating

The Teflon layer on the parts offers excellent corrosion resistance, water resistance, and non-stickiness with a non-reactive surface.

Fine machining

The higher-precision machines produce delicate machining surfaces by utilizing sharper tools and regulating feed rate and cutting speed. Surface roughness up to Ra 0.8 μm can be maintained with smooth machining.

Laser Cladding

Provides excellent corrosion, wear, and abrasion resistance. Laser Cladding is also effective for treating minor surface imperfections such as cavities, tiny cracks, and rust damage.


Provides a random, non-linear texture with a shiny, high gloss finish. However, it might be unable to create sharp corners and pockets

3 Ways to Ensure Perfection



For metals, the standard is ISO-2768 fH (fine)

For plastics, the standard is ISO-2768 mK (medium)

Metric threads tolerances:ISO 965-1 standard UN Threads Tolerances: ASME B1.1-2003 standard

knurling: ISO13444:2012 standard Our factory is ISO 9001:2015 certificated

Visual inspection and Protection

Constant visual inspection conditions

Quantification of cosmetic surface quality

Process requirements

Part cleaning and Protection

Quality Inspection Report

Inspection Confirmation

Dimensional confirmation

Appearance confirmation

Quality documentation

Design guides

Design Guidelines-CNC Machining and Sheet Metal

You’ll find it all here, from the material, selection, and standard tolerances to design advice for each operation we provide, including sheet metal bending, Laser-cutting, water-jet cutting, and surface finishing options.

Technology Overview

What does EDM stand for in machining?

EDM is a machining process that fabricates metal parts by a material removal process using thermal and electrical energy to acquire the desired shape. Electrical discharge machining is the process of eroding material in a controlled manner from the work surface to shape or enlarge the workpiece by employing the discharge of electricity between the tool, which serves as the cathode, and the workpiece, which serves as the anode.

The main components of a conventional EDM are:

• A DC power source.
• A controlled feed.
• A tool connected to the negative terminal of the source.
• Dielectric fluid.

It is an expensive alternative when conventional machining machines’ capability is insufficient. In addition, this process is an unorthodox machining method because, ideally, there is zero physical contact between the tool and the workpiece. That means there is no involvement of any mechanical force to remove material from it.

EDM is applicable for machining only electrically conductive materials. EDM approach is also known as spark machining, dies sinking, wire erosion or spark eroding. This machining is specially used to make fragile and complex cavities, cuts, and sections like webs fins, small holes, and slots with great precision and accuracy. That’s why they are used in making medical devices and equipment. In addition, it can work on surfaces with a high degree of hardness, like pre-hardened metals and alloys used to make dies and molds.

Types of Electric Discharge Machining (EDM)

There are three different types of Electric discharge machining (EDM) processes. Sinker discharge machining, Wire cut EDM, and Hole driller EDM.

First, sinker discharge machining is employed to create cavities in the workpiece, such as in mechanical tools, dies, and molds. Here, to produce the cavity, an electrode is inserted into the workpiece’s surface in the shape of the needed cavity.

Wire cut EDM uses copper wire electrodes of thickness varying from 0.02 to 0.3 mm. The wire electrode is continuously fed from the automatic feeder with the spool throughout processing. It is used for machining hardened metal and alloys, which are challenging with other machining operations such as drilling and punching.

Hole driller EDM used small holes, which can be later enlarged with the wire cut EDM approach. Although, this process itself is fully capable of drilling exact small holes in hard & tough materials.

The Working Principle of EDM

The working principle of the EDM process is based on workpiece metal erosion with the application of a spark discharge between the tool and the workpiece. When two conductors connected to a circuit as an anode and a cathode are brought nearby, a dielectric fluid in the gap ionizes and generates an electric arc between two conductors, which erodes a small amount by generating enough heat to crack and vaporize the metal. When the anode and cathode are made up of the same metal, heavier and faster erosion occurs at the anode. A distance of 0.05 mm is maintained between the workpiece and the tool. The spark occurs where the tool and the workpiece are the closest. The tool’s shape is generally the shape of the impression generated on the workpiece.

A dielectric fluid like hydrocarbons and mineral oils is used to increase the effectiveness of the process. A DC pulse generator applies a voltage from 40 to 3000 volts. It generates a high voltage electric pulse responsible for generating the spark. The workpiece is connected to the anode, whereas the shape replica tool generates the cathode. A spark generator creates the spark and maintains the discharge.

A servo motor controls the feed and maintains a constant gap between the workpiece and the tool. The dielectric substance also works as a coolant. It is filtered regularly to remove the material suspended in the dielectric substance.

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What materials can be cut with EDM?

Since the electrode must remove the material, only metals and alloys that can conduct electricity, such as aluminum, copper, steel, brass, and titanium, can be utilized with wire and sinker EDM.

How many different kinds of electrical discharge machining exist?

Electrical discharge machining comes in three different types. The Wire Cut EDM is used for minor hole drilling, punching, logos, and stamping dies. A wire electrode is continually fed from the automatic feeder with the spool throughout processing. The Sinker Discharge Machining uses graphite and copper electrode and is very effective for complex shapes. Finally, Hole Drilling EDM precisely drills very small deep holes.

What types of shapes can a wire EDM machine produce?

EDM wire machines can produce various shapes, including logos, stamping dies, minor hole drilling, and blanking punches. Internal fillets and corners.

What benefits can the EDM technique offer?

The capacity to obtain high levels of precision and accuracy is one of three key advantages. Second, because there is no direct contact between the tool and the workpiece, EDM requires less force. Finally, this approach does not have problems with the work material’s hardness and toughness, but other machining techniques have.

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