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Precision EDM Machining Services for Custom Metal Parts
Sundi MFG provides Wire EDM, Sinker EDM, and Hole Drilling EDM services for custom metal parts, mold components, carbide parts, hardened steels, and other conductive materials. We support tight tolerances, small batches, and repeat production based on your drawings.
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Wire & Sinker EDM Capabilities
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Machining Ultra-Hard Alloys
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EDM Tolerances down to ±0.002mm
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Complex Profiles & Sharp Corners
- Quote in 8h
- 7-15 Days Lead Time
- STEP / DXF / IGES Accepted
- Strictly Confidential (NDA Supported)
Complex EDM Parts Require More Than Standard Machining
Many custom parts become difficult when conventional machining cannot reach deep slots, sharp internal corners, small cavities, hardened materials, or fragile features.
At Sundi MFG, we don’t just run EDM machines — we review the part structure, material, tolerance requirements, electrode or wire-cutting strategy, and finishing needs before production starts.
For complex EDM components, we can combine Wire EDM, Sinker EDM, CNC machining, and Precision Grinding to achieve tighter dimensional control and consistent quality.
EDM Capabilities
At Sundi MFG, we provide a complete range of Electrical Discharge Machining (EDM) capabilities to support custom precision parts, mold components, carbide parts, hardened steel parts, and complex conductive materials. From fine Wire EDM profiles to precise Sinker EDM cavities and deep micro-hole drilling, our EDM processes help achieve tight tolerances, clean details, and stable quality for both prototypes and repeat production.
Wire EDM
Sinker EDM
Hole Drilling EDM
EDM Materials
EDM can process any electrically conductive material, regardless of its hardness. At Sundi MFG, we specialize in EDM machining for ultra-hard metals and exotic alloys that are difficult to cut conventionally. If your project requires specialty conductive materials not listed below, please contact our engineering team.
| Material Category | Typical Materials & Applications |
|---|---|
| Carbide & Ultra-Hard Metals | Tungsten Carbide, High-Speed Cobalt. (Ideal for stamping punches, wear parts, and precision die inserts) |
| Tool Steels & Hardened Steels | D2, H13, SKD11, SKD61, ASP Steels, Carbon Steel. (Essential for plastic molds and metal stamping dies) |
| Exotic & High-Temp Alloys | Inconel, Titanium, Hastelloy, Molybdenum. (Ideal for aerospace and medical components) |
| Stainless Steels | 304, 316, 420, 440C. |
| Copper & Copper Alloys | Pure Copper, Brass, Bronze. (Often used for EDM electrodes and precision contacts) |
| Standard Conductive Metals | Aluminum (6061, 7075), Nickel, Magnesium. |
Featured EDM Case Studies
Real-world examples demonstrating how we apply advanced EDM technology to solve complex manufacturing challenges.
Complex Component Manufacturing with Precision Wire EDM
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Project Overview
Manufactured a highly intricate component for an advanced electronic device, demanding extreme precision and micro-detailing within a strictly compact form factor.
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Component Description
The design featured delicate micro-slots and perfectly sharp internal corners that are physically impossible to machine using traditional rotary CNC tools.
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EDM Process
Deployed advanced Wire EDM to flawlessly cut complex profiles. This non-contact process ensured zero mechanical stress, preventing any delicate material distortion.
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Material Used
Processed a specialized, high-grade conductive alloy chosen for its exceptional durability, guaranteeing the component's long-term functionality and seamless operational performance.
Sinker EDM Machining for Tungsten Carbide Dies
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Project Overview
Manufactured a highly complex deep drawing die for stretch film production, featuring a wear-resistant tungsten carbide insert embedded within a steel base.
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Material and Design
Tungsten carbide offers extreme hardness necessary for high-volume stamping, making its internal cavities impossible to machine using conventional CNC milling tools.
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EDM Process
Deployed precision Sinker EDM utilizing custom electrodes to accurately erode the intricate internal blind geometries with zero mechanical stress or distortion.
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Final Result
Achieved the exact cavity profile with tight tolerances and superior surface finish, ensuring seamless die operation and significantly extending tooling lifespan.
Sinker EDM for High-Polish Injection Molds
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Project Overview
Engineered a high-precision plastic injection mold insert featuring extremely deep, narrow cavities that required a flawless mirror-like surface finish.
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Material and Design
Crafted from premium, specialized plastic mold steel, specifically selected for its exceptional durability and superior high-gloss polishability characteristics.
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EDM Process
Utilized advanced Sinker EDM to precisely erode the intricate cavity profiles, achieving an ultra-fine surface texture to minimize manual polishing.
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Challenge and Solution
Deep contours made conventional polishing extremely difficult. Precision Sinker EDM delivered exact dimensional accuracy, enabling a flawless final mirror finish.
Scalable EDM Production Capacity
Equipped with 33 advanced Sodick, Seibu, and Makino EDM centers, our facility supports custom prototypes, small batches, and high-volume repeat production while keeping machining quality consistent across every batch.
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24 Wire EDM Centers
Housing 10 Seibu and 14 Sodick machines, including specialized M250P and AP450L Oil-Cut systems for superior carbide surface integrity.
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Sinker & Micro-Hole EDM
Equipped with 5 advanced Sinker EDMs (Makino EDGE2, Sodick AD32LS) and 4 Fast Hole Drillers for intricate 3D cavities.
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Rigorous CMM Inspection
Guaranteeing extreme precision and zero-defect delivery using industry-leading Zeiss Bridge CMMs and high-resolution Nikon Profile Projectors.
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ISO 9001:2015 Certified
Ensuring strict adherence to international quality management standards with fully documented, traceable manufacturing procedures at every stage.
Why We Provide Engineer-Reviewed Quotes
EDM pricing depends on material, thickness, tolerance, surface finish, hole size, machining path, and part complexity. That is why we do not rely on automatic online pricing. Every drawing is reviewed by our engineering team before quotation, so we can provide a more accurate price, realistic lead time, and suitable machining plan.
Our Ordering Process
We are a direct-to-factory manufacturer, not a brokered quote platform. Every component is engineered, machined, and inspected in-house at Sundi. This ensures complete control over technical precision, production lead times, and data security from your initial drawing to final delivery.
Send RFQ
Submit your 2D/3D CAD models and technical specifications via our secure online form or direct email.
Review & Quote
Our technical team evaluates your drawings for manufacturability and provides a detailed, data-driven quotation within 12 hours.
Confirm Order
Finalize technical parameters, confirm tolerances, and lock in the production schedule prior to contract sign-off.
Production
CAM programming is executed, and production begins across our specialized CNC, EDM, or stamping lines.
Quality Inspection
In-process dimensional checks and a comprehensive final inspection ensure all parts meet specified tolerances before leaving the floor.
Packaging & Shipping
Components are meticulously packed using dedicated protective materials to prevent transit damage and shipped globally.
Precision EDM Machining FAQs
What drawing formats do you accept?
For the most accurate quotation, please provide 3D CAD files (STEP, IGES, X_T, SolidWorks) to evaluate complex geometries, along with 2D drawings (PDF, DWG, DXF) calling out specific tolerances, surface finishes, and threaded holes.
Can you machine carbide or hardened steel by EDM?
Absolutely. Machining ultra-hard metals is our core expertise. Since EDM is a non-contact, thermal process, it easily machines Tungsten Carbide, hardened tool steels (D2, H13), and Inconel regardless of their hardness. We even utilize specialized Oil-Cut EDM for carbide to ensure zero cobalt depletion and a perfect surface integrity.
What tolerance can EDM machining achieve?
Utilizing our state-of-the-art Seibu and Sodick EDM centers, we consistently achieve extreme tolerances down to ±0.002mm. Every critical dimension is strictly verified in-house using our advanced Zeiss Bridge CMMs and Nikon Profile Projectors.
Is EDM suitable for small batch production?
Yes. We offer flexible manufacturing with NO MOQ for prototyping. Furthermore, with a scalable capacity of 33 in-house EDM machines, we can seamlessly transition your project from a single prototype to high-volume batch production while maintaining exact consistency.
What information do you need for quotation?
To provide an accurate, engineer-reviewed quote, please send us your 2D/3D drawings, required material (type and grade), order quantity, critical tolerances, and any specific surface finish or secondary operation requirements.
Do you provide inspection reports?
Yes. As an ISO 9001:2015 certified manufacturer, we can provide comprehensive quality documentation upon request, including First Article Inspection (FAI) reports, material certificates, and detailed CMM dimensional reports to ensure full traceability.
Can you support mold components and punch die parts?
Yes, this is one of our primary applications. Our precision Wire and Sinker EDM services are ideal for manufacturing complex injection mold inserts, deep drawing dies, extrusion dies, and punch components that require perfectly sharp internal corners and mirror-like finishes.
