CNC Machining Services

Electrical Discharge Machining

At a glance

Lifecycle

Prototyping (low qty)

Lead Time

As fast as 7 days

Materials

All available metal materials

Tolerance

ISO grade 7 to 12

Machines

Fictiv’s manufacturing network includes a range of EDM machines, including:

Part size Min fillet radius Max cutting depth
Wire EDM Minimum: 8 x 8 mm Maximum: 350 x 350 mm 0.5 mm 350 mm
Sinker EDM Minimum: 0.3 x 0.3 mm Maximum: 800 x 800 mm 0.5 mm 500 mm

About the Process

Fictiv offers two types of Electrical Discharge Machining (EDM) processes, which are useful for cutting deep pockets and complex features such as gears and holes with a keyway. EDM is also a non-contact machining method and does not exert cutting forces on the part, therefore it works particularly well for delicate structures.

Wire EDM

Wire EDM is performed by submerging a metal part in dielectric fluid where an electrically charged wire is then fed through the submerged metal component. The current passing through the wire creates sparks which cut through the material and form the desired shape of the component. Wire EDM is an ideal manufacturing process when you have clearance for the wire above and below the part feature.

Sinker EDM

The first step to performing Sinker EDM is to machine an electrode into the shape of the cutout you want to make. Sinker EDM is then performed by plunging your charged electrode into the metal component, which is submerged in dielectric fluid. The current passing through the electrode creates sparks which cut away the metal and form the desired shape of the internal feature.

Sinker EDM can be used to make bevel gears, internal gears, spiral gears, worm gears, however the process is very slow and costly so this may not be the best method for all applications. Sinker EDM can be used to create hard-to-reach, angular internal features such as blind keyholes which cannot be machined using other methods.

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Electrical Discharge Machining (EDM) FAQs

What is electrical discharge machining?

Electrical Discharge Machining, also known as EDM, is a non-contact machining procedure used to make parts where material is removed from a workpiece using electrical spark erosion. EDM is good for more delicate projects as it does not exert cutting forces on the workpiece.

What are the types of electrical discharge machining?

There are two main types of Electrical Discharge Machining (EDM) processes - wire EDM and sinker EDM, which are useful for cutting deep pockets and complex features such as gears and holes with a keyway.

What types of shapes can a wire EDM machine produce?

Wire EDM machines can handle jobs that can be too intricate or delicate for other methods of machining, such as internal fillets, corners, or other very small and complex parts.

What happens in the EDM process?

The EDM process consists of a metal part being submerged in dielectric fluid, where an electrically charged wire is then fed through the submerged metal component to make the precise cuts.

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