The Challenge: When Conventional Machining Reaches Its Limit
A leading medical device manufacturer kept running into the same production bottleneck. The part was a complex surgical instrument component requiring sharp internal corners, intricate contours, and extreme hardness in a single piece. Hardened stainless steel was the natural material choice for its biocompatibility and wear resistance, but its hardness made conventional machining difficult. Electric Discharge Machining (EDM) offered a better solution for producing these challenging medical components.
Two problems stacked up. The internal geometry required corners with a 0.2 mm radius, too tight for standard milling tools without deflection or breakage. The material was also above 55 HRC, causing rapid tool wear and poor surface finishes. Traditional machining created burrs that required extensive secondary deburring, increasing costs and dimensional risks. Scrap rates reached 12%, while production delays affected OEM deliveries.
They had already tried specialized carbide tooling, slower feed rates, and additional finishing passes, but nothing worked reliably. They needed precision EDM machining capable of processing hardened materials without mechanical cutting forces, while maintaining micron-level accuracy and repeatability. With advanced Wire EDM services and precision EDM machining services, the complex component could be produced more efficiently, accurately, and consistently across production runs.
The Solution: MW+ Wire EDM Services
MW+ MetalWorks Plus, a Shenzhen-based precision manufacturer in business since 2010, proposed a complete wire EDM (WEDM) approach. The principle is easy to understand: instead of a cutting tool, a thin brass or copper wire, from 0.02 to 0.3 mm in diameter, acts as the electrode, and precisely controlled electrical sparks do the cutting. There is zero mechanical force on the workpiece, which means no tool deflection, no vibration, and none of the stress that distorts fragile geometries.
The MW+ Approach
| Phase | Action | Outcome |
| DFM Review | Engineering analysis of CAD geometry for EDM feasibility | Optimal cutting strategy identified |
| Wire Setup | Precision wire tensioning on Sodick WEDM machines | Consistent, repeatable cuts |
| Rough Cut | High-speed material removal at elevated pulse energy | Rapid stock removal preserving bulk shape |
| Skim Passes | Multiple precision skim cuts refine geometry | ±0.005mm tolerance achieved |
| CMM Verification | Zeiss CMM inspection of all critical dimensions | Full dimensional report issued |
MW+ ran the components on advanced Sodick wire EDM machines with adaptive servo control, automatic wire threading, and real-time spark optimization. The process delivered these numbers:
- Tolerance: ±0.005 mm (±0.0002″)
- Surface Finish: Ra 0.2 µm, mirror quality
- Taper Capability: Up to ±30°
- Material Hardness: Up to 65 HRC, hardness is no barrier
The hardened stainless steel came out with the same precision as any softer alloy, because EDM erodes material electrically rather than cutting it mechanically. The sharp internal corners that no end mill could reach were cut cleanly by the thin wire, and burrs never had a chance to form, since spark erosion leaves a clean, stress-free edge.
The Result: Measurable Impact
The first production batch shipped within five days of approval—MW+’s standard prototype lead time. The numbers tell the story:
| Metric | Before (Conventional) | After (MW+ Wire EDM) |
| Scrap Rate | 12% | <1% |
| Tolerance Achieved | ±0.02 mm (best case) | ±0.005 mm |
| Surface Finish | Ra 1.6 µm | Ra 0.2 µm |
| Internal Corner Radius | 0.5 mm (limitation) | 0.2 mm (achieved) |
| Secondary Operations | Deburring required | None required |
| Lead Time | 4–6 weeks | 5 days (prototype) |
Every part now passes 100% CMM inspection on MW+’s Zeiss CMM, with each critical dimension verified and documented. The manufacturer dropped the secondary deburring operation entirely, saving roughly 15% of total manufacturing cost. And the 99.7% quality acceptance rate MW+ guarantees across all production runs has held up—the customer has not rejected a single part since.
There was a strategic payoff too. MW+’s ISO 9001:2015, ISO 13485:2016 (medical devices), and ITAR registration gave the customer the regulatory documentation their FDA submission required. Full material traceability, from certified billet to finished component, satisfied their quality auditors. And with no minimum order quantity and global delivery in 2–7 days, they now have a reliable supply-chain partner for both prototyping and production.
Why MW+ for Wire EDM Services?
Precision Infrastructure
- 15,000 m² facility in Shenzhen GuangMing District
- 60+ multi-axis CNC machining centers, including advanced Sodick WEDM machines
- Dedicated metrology laboratory with Zeiss CMM and optical comparators
- Temperature-controlled workshop at 20°C ±0.5°C, eliminating thermal expansion errors
Certifications That Matter
- ISO 9001:2015, Quality Management System
- AS9100 Rev D, Aerospace Quality Management
- ISO 13485:2016, Medical Device Manufacturing
- IATF 16949:2016, Automotive Quality Management
- ITAR Registered, Defense-grade export handling
Quality Metrics
- 99.7% quality acceptance rate
- 98.5% first-pass yield
- 99% on-time delivery
- 97.3% client retention
- Cpk > 1.67 on 98% of production characteristics
Full In-House Capabilities
- Wire EDM (±0.005 mm, Ra 0.2 µm)
- Sinker EDM (cavities, blind pockets, 3D features)
- Small-hole EDM drilling (high-aspect-ratio holes)
- 3-axis, 4-axis, and simultaneous 5-axis CNC milling
- Swiss-type CNC turning (down to 0.3 mm diameter)
- Precision surface finishing (anodizing, passivation, electropolish, hard chrome, powder coating, black oxide)
Metalworks Plus – Precision Manufacturing & CNC Machining Expert
MW+ is a precision manufacturing company specializing in high-quality CNC machining and custom metal fabrication solutions from prototype to full-scale production. Founded in China, the company combines advanced technology with rigorous quality control to serve industries such as aerospace, automotive, medical, electronics, and industrial equipment.
💡 Learn more: https://metalworksplus.com
Services
- CNC Machining Services – full‑service precision machining
- Multi‑Axis Machining – 3/4/5‑axis milling
- Micro‑Machining Services – ultra‑fine tolerances
- Swiss Machining – Swiss turning for slender parts
- CNC Milling Services – complex contours & surfaces
- CNC Turning Services – cylindrical & tapered profiles
- Electric Discharge Machining – EDM for hardened steels
- Laser Cutting Services – high‑speed sheet cutting
- CNC Prototyping – rapid prototyping in days
- Machine Parts Manufacturing – custom structural & functional parts
Products
- CNC Precision Parts – tight‑tolerance components
- Connector & Machined Pins – custom pins for assemblies
- Machine Parts – housings, brackets, shafts, gears
FAQ
Q: What is Wire EDM (Electrical Discharge Machining)?
Wire EDM uses a thin, continuously moving wire electrode to cut conductive materials through precisely controlled electrical sparks. It exerts zero mechanical force, which is why it can handle hardened materials, sharp internal corners, and fragile geometries without distortion.
Q: What tolerances can MW+ achieve with Wire EDM?
MW+ achieves ±0.005 mm (±0.0002″) on wire EDM components, with surface finishes down to Ra 0.2 µm.
Q: What materials can be EDM machined?
Any electrically conductive material, regardless of hardness. MW+ routinely processes tungsten carbide (90 HRA), hardened D2 steel (62 HRC), Inconel 718, titanium, and stainless steel.
Q: What industries does MW+ serve with Wire EDM?
Aerospace, medical devices, automotive and EV, electronics, energy, robotics, and industrial.
Q: What certifications does MW+ hold?
ISO 9001:2015, AS9100D, ISO 13485:2016, IATF 16949:2016, and ITAR registered.
Q: How quickly can MW+ deliver Wire EDM prototypes?
MW+ offers 3–5 day prototype lead times for wire EDM components, with global delivery in 2–7 days.
Conclusion
When conventional machining reaches its limits, whether the blocker is material hardness, complex geometry, or internal features that are simply out of reach, wire EDM is the answer. And when you need it executed with precision, speed, and the regulatory compliance that regulated industries depend on, MW+ MetalWorks Plus is the partner to call.
From its 15,000 m² ISO-certified facility in Shenzhen, MW+ delivers wire EDM that holds ±0.005 mm tolerances and Ra 0.2 µm finishes, cutting materials up to 65 HRC with zero mechanical force. Backed by 120+ engineering professionals, Zeiss CMM verification, and certifications spanning aerospace, medical, automotive, and defense, MW+ does not just machine parts, it solves manufacturing problems.
Ready to discuss your Wire EDM project? Visit metalworksplus.com or contact our engineering team for a free DFM analysis within 12–24 hours. No minimum order quantity. Global delivery in 2–7 days.
Further Reading: Intelligence for Precision Manufacturing
- Regulatory Inspection: China Machined Parts Manufacturing – A guide to the five-stage inspection process (IQC, IPQC, FAI, final inspection, audits). Covers international standards (ISO 9001, AS9100D, ISO 13485, IATF 16949) and Chinese regulations (GB/T, JB/T), inspection equipment (CMM, vision systems, spectrometers), and common non-conformances with preventive strategies.
- Margin Optimization: CNC Lathe Services & Custom Turning – A practical guide to reducing turning costs. Covers cost drivers (material, machine time, setup, tolerances), design changes that cut 20-30% of cost, material vs. machinability comparisons, and batch strategy to lower per-piece pricing.
- Performance Audit: High-Precision 5-Axis CNC Machining Runs – A guide to benchmarking CNC suppliers with real data. Covers positioning accuracy (±0.005 mm), repeatability (±0.002 mm), Cpk ≥ 1.33, surface finish (0.4–0.8 µm Ra), and a practical scorecard for comparing shops objectively.
- Method Trade-Offs: Electric Discharge Machining (Wire EDM) – A guide to wire EDM vs. CNC milling, laser, and waterjet. Covers tolerances down to ±0.005 mm, materials (hardened steel, carbide, titanium, Inconel), surface finishes (0.1–0.4 µm Ra), why hardness stops mattering, and when EDM is worth the cost.
- Engineering Walkthrough: About CNC Milling Services & Parts – An engineering walkthrough of contract CNC milling services. Covers the process from CAD to precision parts, tolerances down to ±0.005 mm, materials (aluminum, stainless, titanium, plastics), certifications (AS9100D, ISO 13485, IATF 16949), and a practical checklist for buying CNC machining services.
- Explainer: Custom Sheet Metal Laser Cutting Services – A guide to heavy-duty fiber laser cutting. Covers fiber vs. CO2 lasers, materials (stainless, aluminum, carbon steel, copper/brass), thickness ranges up to 40mm, tolerances of ±0.05 mm, certifications (ISO 9001, AS9100D, ISO 13485, IATF 16949), and how to get a cost-effective quote.
- Top 10 Best CNC Machining & Milling Companies in the World – A side-by-side ranking of leading global manufacturers (US, Germany, Japan, China) based on capability, certifications, and cost. Includes a detailed comparison of machining costs, lead times, and best-fit use cases for Western buyers vs. Chinese suppliers.
