E01Non-force Precision Machining
Adopts spark erosion processing without mechanical cutting force, effectively protecting thin-walled, fragile and ultra-hard parts from deformation and tool pressure damage.
EDM Machining
Precision Sinker EDM Services | Custom Electrical Discharge Machining Parts
We provide on-demand custom CNC machining services, covering turning, milling, EDM, wire-cutting and other processes. We produce precision metal and plastic parts from prototype to mass production.
High-precision EDM machining services for complex, hard-to-cut and sharp-corner precision components with ultra-tight tolerances and zero mechanical cutting force.
Drawing to production
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EDM / SERVICE
Service Overview
Controlled dielectric work zone
ElectrodeSpark gapConductive workpiece
Select the discharge route
Form blind cavities with a shaped electrode
A shaped electrode reproduces cavities, sharp internal geometry and deep details without direct tool contact.
E02Complex Structure Forming
Capable of processing ultra-narrow slits, sharp inner corners, deep tiny cavities and irregular special-shaped structures that traditional cutting cannot complete.
E03Hard Material Adaptability
Processes all conductive metals regardless of hardness, including hardened steel, tungsten steel and high-strength alloy materials without tool wear limitations.
E04High-precision & Burr-free
Achieves micro-level precise material removal with no cutting burrs, eliminating secondary deburring procedures and improving part consistency.
E05Flexible Production Mode
Supports low MOQ prototype trial processing and stable large-batch production, adapting to diverse customized precision component demands.
E06Complete Post-processing Support
Matched with full in-house surface finishing and precision inspection services to provide integrated finished product solutions.
We provide professional custom EDM (Electrical Discharge Machining) services focused on high-precision hard material and intricate structure component manufacturing. Equipped with advanced wire cut EDM, sinker EDM and hole drilling EDM equipment, we deliver one-stop EDM machining solutions from rapid prototyping to large-scale mass production. Our stable processing capacity ensures high-precision, burr-free and deformation-free quality for all complex custom parts with consistent batch stability.
Sinker EDM (Electrical Discharge Machining) is a non-contact precision manufacturing process that removes material via high-frequency electrical spark erosion. Different from traditional cutting methods, EDM generates no mechanical cutting force, making it ideal for ultra-hard metals, thin-walled fragile structures, sharp inner corners, narrow slits and intricate micro features that cannot be processed by conventional CNC machining. It achieves high-precision material removal with zero burrs, zero deformation and excellent dimensional repeatability.
EDM / MACHINING
Our Sinker EDM Machining Capabilities
Discharge machining envelope
Wire Cut EDM, Sinker EDM, EDM Hole Drilling, Micro Slit Machining
Tolerance
±0.003mm ~ ±0.01mm
Minimum slit
0.05mm
Minimum hole
0.1mm
Roughness
Ra 0.4μm — Ra 1.6μm
Electrode-to-workpiece spark gap
Acceptable Files
STEP, IGES, DXF, DWG, PDF
Lead Time
3–5 days for prototypes, 10–15 days for mass production
EDM / METAL
Metal Materials
Our EDM machining process is applicable to almost all conductive metal materials, free from material hardness and cutting difficulty limitations. We support conventional stainless steel, carbon steel, alloy steel, non-ferrous metals and ultra-hard mold alloys. Each material features stable spark discharge performance and controllable machining effects. Below are the mainstream processable metals, corresponding machining performance characteristics and commonly used material grades for your reference.
Hardness does not replace conductivity
Selected conductive material
Stainless Steel
Excellent conductivity and stable spark erosion effect, no burrs and no deformation after EDM processing. Ideal for corrosion-resistant precision structural parts and medical equipment components with strict dimensional requirements.
Common grades
303, 304, 316, 420, 440C
TYPICAL / EDM
Typical EDM Machining Components
Electrode geometry defines the eroded feature
Selected spark-eroded component
Precision Mold Inserts & Cavities
Custom mold cores, narrow slit inserts and sharp-corner mold cavities with high hardness and high-precision matching for injection molds and stamping molds.
EDM / SURFACE
Surface Finishing for EDM Machining Parts
We deliver full in-house surface finishing solutions for all custom EDM components. All post-processing procedures are independently completed in our workshop, effectively removing tiny spark marks, improving surface smoothness, and enhancing corrosion resistance and wear resistance while retaining precise dimensional tolerances.
Post-process the spark-eroded surface without losing geometry
Selected post-process
Polishing
Precision polishing removes tiny spark lines and micro surface defects left by EDM processing. Available in brushed and mirror finishes, it greatly improves surface smoothness for high-end assembly and aesthetic requirements.
Component families
Industry Application
Our high-precision custom EDM machining components are widely applied in high-standard precision manufacturing fields worldwide
Selected component family
Precision Mold Inserts & Cavities
Custom mold cores, narrow slit inserts and sharp-corner mold cavities with high hardness and high-precision matching for injection molds and stamping molds.
Select an industry scenario to review the matching application context.
Discuss an EDM Application
EDM / DESIGN
EDM Machining Design Guidelines
Active engineering chapter
Spark gap, slit depth and micro-hole heat
Reserve Reasonable Spark Gap
Reserve a standard 0.01mm–0.03mm spark gap for all EDM mating surfaces. Zero-gap designs cause discharge interference and dimensional inaccuracy during spark erosion
Limit Slit Depth-width Ratio
Control the slit depth-to-width ratio within 8:1. Excessively deep and narrow slits lead to poor residue removal and unstable spark discharge, causing uneven surface finishes
Optimize Micro Hole Spacing
Keep micro hole spacing above 0.2mm. Dense ultra-small holes generate concentrated heat during continuous discharge, triggering thermal deformation and dimensional deviation
EDM / PROCESS
EDM Production Process
A controlled route from electrode strategy to dimensional and surface verification.
EDM traveler
The spark gap, access and flushing strategy are fixed before erosion begins.
- 01
Review geometry and conductive material
Confirm the cavity, slit, hole or contour, then identify critical dimensions, surface requirements and inspection datums.
- 02
Plan electrode and spark allowance
Define electrode geometry, spark gap, access direction and the dimensional allowance needed for controlled erosion.
- 03
Prepare datum and dielectric setup
Establish a stable positioning reference and arrange dielectric circulation or flushing for the selected EDM route.
- 04
Run controlled spark erosion
Apply staged discharge parameters to remove material while controlling heat, debris evacuation and feature accuracy.
- 05
Complete specified post-processing
Apply the requested polishing or protective finish while preserving critical cavity, slit, hole and edge geometry.
- 06
Inspect dimensions and surface result
Verify dimensional accuracy, feature size and surface condition before the batch is released.
WHY / CHOOSE
Why Choose Our EDM Machining Service
EDM production evidence
±0.002mm
tightest stated EDM tolerance
0.05mm
minimum slit width
0.1mm
minimum hole diameter
Non-contact spark erosion processing technology
Adopts electrical discharge machining with zero mechanical force, fundamentally eliminating deformation, tool extrusion damage and burr issues of thin-walled and hard materials.
Ultra-high precision dimensional control
Achieves precision tolerance up to ±0.002mm, stably reproducing sharp corners, ultra-narrow slits and micro hole features that traditional machining cannot complete.
Unlimited material hardness processing
Effectively processes all conductive metals including quenched steel and tungsten steel, breaking through the hardness limitation of conventional cutting tools.
Diversified EDM process coverage
Equipped with wire cut, sinker and drilling EDM equipment to meet full-process processing requirements of cavities, slits, holes and special-shaped structures.
Full in-house one-stop service
Integrates machining, deburring, surface finishing and precision testing to simplify procurement procedures and ensure stable batch quality.
Strict precision quality inspection system
Every batch of EDM parts undergoes full dimensional inspection and surface quality testing, with official inspection reports provided before delivery.
Precision Sinker EDM Services | Custom Electrical Discharge Machining Parts Articles
Read recent technical articles related to this service before preparing your RFQ.
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What is EDM machining used for?
EDM machining is a specialized non-contact precision manufacturing process, mainly used for processing high-hardness metals, ultra-narrow slits, sharp inner corners, micro holes and complex special-shaped parts that cannot be completed by traditional CNC cutting.
What materials can EDM process?
EDM is applicable to all conductive metal materials, including stainless steel, hardened steel, alloy steel, tungsten steel, brass, copper and titanium alloy. Material hardness does not affect processing efficiency and accuracy.
What is the minimum feature size for EDM?
We support a minimum slit width of 0.05mm and a minimum micro hole diameter of 0.1mm, capable of machining various ultra-fine micro structures.
Does EDM machining produce burrs?
No. EDM removes material via spark erosion without mechanical cutting, resulting in zero edge burrs and eliminating secondary deburring processes.
Will EDM processing deform parts?
No mechanical cutting force is generated during EDM processing, ensuring zero deformation for thin-walled, fragile and high-precision components.
What is your tightest EDM tolerance?
We can achieve ultra-high precision tolerance up to ±0.002mm, meeting strict precision requirements for high-end mold and equipment components.
Can you customize special-shaped EDM parts?
Yes. We provide full custom EDM manufacturing services according to customer 2D/3D drawings, supporting all kinds of complex irregular structural parts.
Can you support mass production of EDM parts?
Yes. Our standardized EDM production system supports stable batch processing with consistent dimensional accuracy and surface quality for large orders.
How about your EDM delivery cycle?
Prototype orders take 3–5 working days, and mass production takes 10–15 working days, adjusted according to part complexity and order quantity.
Project inquiry
Send your CAD drawings to get professional custom EDM machining solutions and accurate quotations.
Equipped with full-series EDM processing equipment and complete in-house surface finishing capacity, we provide free DFM analysis and one-stop technical consultation for all complex precision component projects.