CNC Grinding
Precision surfaces, fit-critical features and post-machining accuracy support for demanding assemblies.
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- Grinding support for tight size control and smoother functional surfaces
- Turn-mill machining for parts with both rotary and milled features
- EDM processing for hard materials and sharp internal details
Drawing to production
We are trusted bypartners like
Our customer logos represent long-term cooperation across precision machining, optics, automotive, medical devices, robotics, electronics and industrial equipment.
Choose the right route without losing delivery control
Each service is tied to Zhonghanda's 130+ equipment capacity, full-process inspection and account-manager follow-up so overseas buyers can move from sample to repeat production with fewer surprises.
EDM Machining
Non-contact spark erosion for hard materials, deep cavities, sharp inner corners and fine tooling features.
Learn MoreWire Cutting
Wire EDM cutting for conductive materials, narrow slots, mold inserts and accurate 2D profiles.
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Turn-Mill Machining
Turning and milling in one route to reduce setups and improve consistency for complex rotational parts.
Learn MoreRepresentative CNC machined parts we support
Representative component categories supported across machining, finishing and inspection workflows.
Ground precision surfaces
Flat, cylindrical and fit-critical surfaces finished by grinding for tighter dimensional stability.
EDM cavities
Deep cavities, sharp internal corners and hard conductive details produced with non-contact EDM routes.
Wire-cut profiles
Accurate conductive material profiles, narrow slots and mold details cut by wire EDM.
Tooling inserts
Mold inserts, fixture details and hardened tooling features that may combine milling, EDM and grinding.
Fixtures and jigs
Custom production fixtures, positioning blocks and tooling parts for stable assembly workflows.
Inspection-ready parts
Critical components prepared for first-article checks, in-process records and final inspection reporting.
ZHD Precision Working Process
A controlled production workflow for servicePages.preci_mach_title, from engineering review and task preparation to final inspection and delivery.
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Built for demanding engineering applications
Service capabilities are organized around real manufacturing needs across Zhonghanda's target industries.
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Engineering review helps align material, tolerance, finish and inspection requirements for this application.
Inspection fixtures, assembly tools and workholding parts
Engineering review helps align material, tolerance, finish and inspection requirements for this application.
Mold inserts, tooling details and hard-material features
Engineering review helps align material, tolerance, finish and inspection requirements for this application.
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Engineering review helps align material, tolerance, finish and inspection requirements for this application.
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Grinding support for tighter size control, flatness and smoother functional surfaces.
EDM and wire cut routes for hard conductive materials, narrow slots and sharp internal corners.
Turn-mill planning reduces repeated setups for complex rotational components.
Inspection feedback helps keep sample approval and repeat production aligned.
Engineering materials we commonly machine
We support common metals and plastics for prototypes, fixtures and production components. Final material selection can be confirmed during engineering review.
Surface treatment planned with machining
Finishing is coordinated around material, tolerance zones, appearance expectations and end-use environment.
Primary finish route
Passivation
Cleaning and passivating stainless steel components to improve corrosion resistance without heavy coating build-up.
Black Oxide
Low-build black finish for steel shafts, tooling details and mechanical parts requiring a dark appearance.
Powder coating
Durable coating support for machined metal parts that require color and surface protection.
Sanding
Manual or controlled abrasive finishing to remove marks, prepare surfaces and create directional texture.
Bead / Sand Blasting
Creates a uniform matte texture and prepares surfaces for coating or anodizing.
Laser marking
Permanent logos, serial numbers and traceability marks for production and assembly control.
CNC machining tolerances and production notes
Use these capability notes as an engineering reference. Final tolerances depend on material, geometry, finishing and inspection requirements, but every project is reviewed for sample-to-production consistency before release.
| Parameter | Specification |
|---|---|
| General capability | Process options include precision grinding, sinker EDM, wire EDM, hole EDM and turn-mill machining. |
| Precision feature control | Typical parts include mold inserts, fixtures, shafts, sleeves, tooling details and precision assembly components. |
| Material and finish notes | Material suitability depends on hardness, conductivity, geometry, finishing needs and inspection method. |
| Inspection and reporting | Critical dimensions can be reviewed with first-article checks, in-process control and final inspection reporting. |
Inspection support built into every service
Zhonghanda combines incoming checks, first-article inspection, in-process control, final inspection and outgoing verification to support stable custom machined parts.
IQC
Incoming material and component verification before production release.
IPQC
In-process checks for dimensions, appearance and risk control during production.
FQC / OQC
Final and outgoing inspection before packing and shipment, with video confirmation available when required.
Built for buyers who need reliable production follow-through
Engineering feedback
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130+ equipment capacity
A 24-hour production workflow supports samples, low-volume projects and repeat batches.
Finishing coordination
Surface treatment and appearance needs can be planned together with machining.
Representative manufacturing case workflow
A reference-style case section showing how Zhonghanda connects buyer concerns with engineering review, production planning, machining, finishing and inspection evidence.
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Core Challenges
- Grinding support for tight size control and smoother functional surfaces
- Turn-mill machining for parts with both rotary and milled features
- EDM processing for hard materials and sharp internal details
Our Solution
Zhonghanda reviews drawings, confirms manufacturability, plans machining and finishing routes, runs first-article and in-process checks, then verifies critical dimensions with final inspection support before shipment.
servicePages.preci_mach_title Articles
Read recent technical articles related to this service before preparing your RFQ.
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CNC for Complex Metal Housings: What Buyers Should Know
1. Why CNC matters for complex metal housings 2. What the part tells you about the manufacturing route 3. Key features buyers should evaluate 4. Why cast-and-machined aluminum is so common 5. Selection criteria that actually help 6. Practical buyer cautions 7. What to ask before you place an order 8. Next step
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CNC Machining for Cast Aluminum Housings: What Buyers Should Check
1. Why CNC machining matters for cast aluminum housings 2. What this kind of part is designed to do 3. Why high-pressure die casting is often paired with CNC machining 4. Key features buyers should evaluate 5. Common mistakes when sourcing this type of housing 6. What to ask a supplier before ordering 7. How this connects to real buyer decisions 8. FAQ: quick buyer questions 9. Next step
pt888Jul 01, 2026
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CNC Machining for Complex Cast Housing Parts
1. Why CNC machining matters on a complex cast housing 2. What buyers should look for first 3. How the casting and machining stages work together 4. Common sourcing mistakes with machined cast housings 5. Practical selection advice for engineering and procurement teams 6. FAQ: a few questions buyers usually ask 7. What to do next
pt888Jul 01, 2026
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CNC Machining for Cast Industrial Housings: What Buyers Should Check
1. Why CNC matters on cast housings and functional bodies 2. What this type of part is trying to achieve 3. Quick buyer takeaway: what to check before you approve the part 4. Why cnc machining is the critical step 5. Design and sourcing criteria that matter most 6. Common mistakes buyers still make 7. Practical questions to ask a supplier 8. Next step
pt888Jul 01, 2026
What files should I send for a quote?
STEP or STP files are preferred, together with drawings, material, quantity, finish and tolerance requirements.
Can you support prototypes and production?
Yes. Zhonghanda uses 130+ machining centers and 24-hour production scheduling to support prototypes, small batches and repeat production depending on project requirements.
How do you help keep samples and production consistent?
Projects can include first-article inspection, in-process checks, final inspection and video confirmation so critical dimensions and finish expectations stay visible before shipment.
Project inquiry
Upload drawings and get engineering feedback
Send CAD files, material, quantity, tolerances and finish notes. Our team will review manufacturability, inspection points, lead-time risk and production follow-up before quoting.