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Wire EDM Machining Services

Six wire EDM machines for sharp internal corners, hardened tool steel, thin slots and profiles a milling cutter cannot reach. Cut in our own shop in Dongguan, measured before the run continues.

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What it is

Cutting with a wire, not a cutter

Wire EDM erodes material with a thin brass wire and an electrical spark, so there is no cutting force and no tool pressure on the part. Hardness does not matter — we cut hardened tool steel at 60 HRC the same way we cut annealed stock. That is why it is the right process for parts that have already been heat treated, for internal corners smaller than any end mill, and for thin, delicate profiles that would deflect under a milling cutter.

Wire EDM brass wire cutting a steel plate under dielectric fluid at GY Machining
The wire, mid-cut
Row of wire and sinker EDM machines on the GY Machining shop floor in Dongguan
Our EDM bay, Dongguan
Machine and process data

What we can cut

  • Wire EDM machines6
  • Max workpiece400 × 300 × 200 mm
  • Achievable tolerance±0.005 mm
  • Internal corner radiusFrom 0.1 mm
  • Surface finishRa 0.8 – 1.6 µm
  • Taper cuttingYes, up to 15°
  • Material hardnessNo limit — cuts 60+ HRC
  • Wire diameter0.15 / 0.20 / 0.25 mm

Tolerance depends on thickness, material and how many skim passes the drawing justifies. Tell us the critical dimensions and we will tell you what we can hold before you order.

Typical work

What customers use our wire EDM for

Hardened punches and dies

Tool steel, D2, SKD11 and carbide cut after heat treatment, so nothing moves afterwards.

Sharp internal corners

Square pockets, keyways and slots with a corner radius no end mill can produce.

Thin profiles and lamination stacks

Fine features in thin plate that would deflect or burr under a cutter.

Gears, ratchets and cams

Profiles cut straight from plate, with the tooth form held to the drawing.

Extrusion and blanking dies

Land and relief cut in one setup, with taper where the drawing calls for it.

Rework and salvage

Opening a bore, adding a slot or removing a broken tap in a finished part.

Materials

Materials we cut on wire EDM

Any electrically conductive material. Hardness is irrelevant to the process, so heat-treated parts are normal work here.

Tool steel D2 / SKD11A24140H13S7Stainless 303 / 304 / 316L17-4 PHTitanium Gr.2 / Gr.5Aluminium 6061 / 7075Brass C360Copper C110Tungsten carbideInconel
Good to know

Before you send the drawing

How tight a tolerance can wire EDM actually hold?
On a single pass we work to about ±0.01 mm. With skim passes we hold ±0.005 mm, and on short, thin sections we have done better. Thickness matters more than most people expect — a 10 mm plate and a 120 mm block do not behave the same, so tell us the stack height along with the tolerance.
Can you cut a part that is already hardened?
Yes, and it is usually the better order of operations. Cutting after heat treatment means the profile does not move when the part is quenched. Send it hardened, or we can arrange heat treatment and then cut.
Do I need a start hole?
For any closed profile, yes — we drill it here, so you do not need to add it. Tell us if there is a face where a start hole would be unacceptable and we will position it somewhere harmless.
What about the recast layer?
Wire EDM leaves a thin recast layer. For most parts it is irrelevant. If your application cannot accept it — fatigue-critical or medical parts, for example — say so and we will add skim passes or a light polish and note it on the quote.
Related

Often ordered together

Sinker EDM

Blind cavities, square internal features and keyways that a wire cannot reach because there is no through-path. Sinker EDM →

CNC Milling

Most EDM parts are milled first and finished on the wire. Both happen in this building. CNC milling →

Inspection

Every first article measured on the CMM before the rest of the run is cut. Quality and inspection →

Send the drawing. You will have a price and a lead time in 16 hours.

STEP, IGES, X_T, DWG, DXF or PDF. Metric or inch. No minimum order.

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