Precision CNC Machining Services for Custom Parts
Get complex metal and plastic parts manufactured with drawing-specific tolerances, stable process control, documented inspection, and responsive engineering support—from prototype through low-volume production.
When Standard CNC Machining Is Not Enough
High-precision CNC machining is required when a component’s dimensions, geometry, surface condition, and relationship between features directly affect assembly or performance. Typical examples include bearing bores, locating datums, sealing faces, aligned holes, thin walls, concentric diameters, and complex multi-face features.
At 6CNC, precision is not treated as one tolerance number applied to an entire drawing. We review each critical feature, choose an appropriate machining and fixturing strategy, and define how the result will be measured. This approach improves repeatability while avoiding unnecessary cost on non-critical geometry.
Our service is built for engineers, product developers, maintenance teams, and purchasing professionals who need custom parts made to supplied CAD models and drawings.
What We Manufacture
We produce build-to-print components rather than standard catalogue products. The best process depends on geometry, material, tolerance relationships, surface requirements, quantity, and inspection scope.
Housings and Enclosures
Precision bores, sealing faces, pockets, thin walls, and multi-face features for electronics, automation, medical equipment, and instrumentation.
Shafts and Rotational Parts
Stepped shafts, pins, couplings, sleeves, rollers, and turned components requiring concentricity, runout, threads, or controlled diameters.
Plates and Structural Parts
Machine plates, frames, brackets, mounts, fixtures, and base components with controlled flatness, hole position, and datum relationships.
Manifolds and Fluid Parts
Ports, intersecting passages, threads, sealing features, valve bodies, fittings, and flanges manufactured for reliable assembly.
Complex Multi-Axis Parts
Components with compound angles, deep cavities, sculpted surfaces, and features that benefit from fewer setups and improved positional control.
Fixtures and Tooling
Inspection fixtures, nests, clamps, wear components, tooling inserts, and production aids supplied as one-offs or repeat batches.
Precision CNC Machining Capabilities
CNC Milling
For prismatic parts, pockets, surfaces, hole patterns, frames, plates, housings, and fixtures.
CNC Turning
For cylindrical components requiring controlled diameters, concentricity, threads, grooves, and surface finish.
5-Axis Machining
For complex multi-face geometry where reducing setups can improve positional accuracy and lead time.
Mill-Turn Machining
For parts combining rotational and milled features in a coordinated setup with less handling.
Precision Grinding
For selected critical surfaces, hardened materials, close fits, and demanding finish requirements.
Finishing and Secondary Work
Anodizing, plating, passivation, heat treatment, polishing, wire EDM, and other specified operations.
Materials, Tolerances, and Surface Requirements
The values below are purchasing guidelines, not blanket guarantees. Final capability is confirmed after reviewing the drawing, material, part size, feature geometry, datum structure, quantity, and measurement method.
| Requirement | Typical Project Consideration | How We Confirm It |
|---|---|---|
| Dimensional tolerance | General dimensions versus critical fits | Drawing and feature-level engineering review |
| GD&T | Position, flatness, parallelism, perpendicularity, profile, runout | Datum and inspection-method review |
| Surface finish | Functional, sealing, sliding, optical, or cosmetic surface | Ra requirement and process selection |
| Materials | Aluminum, steel, stainless steel, copper alloys, titanium, engineering plastics | Grade, temper, certification, and availability check |
| Part size | Small precision details through larger structural parts | Machine envelope, workholding, and inspection feasibility |
| Batch repeatability | First article through recurring low-volume orders | Controlled setup, revision, and inspection plan |
For highly critical parts, identify CTQ dimensions and the intended assembly or function. This helps us propose a realistic, measurable manufacturing plan.
How We Protect Accuracy and Repeatability
DFM Before Cutting Metal
We review tolerance conflicts, inaccessible features, thin sections, corner radii, tool access, workholding, and inspection feasibility before production.
Stable Datum Strategy
Features are planned around functional datums to reduce setup error and tolerance stacking between related surfaces.
Process and Tool Control
Machining sequence, tool selection, cutting conditions, and intermediate checks are chosen around material behavior and part geometry.
Temperature Awareness
Very tight dimensions require attention to part temperature, measurement conditions, and the time allowed for stabilization.
Appropriate Inspection
CMM, optical systems, roughness testers, and conventional gauges are selected according to the feature and required uncertainty.
Controlled Repeat Orders
Approved revisions, inspection criteria, and repeatable setups help maintain consistency when a project moves beyond its first article.
6CNC Precision Manufacturing Facility
Based in Shenzhen, China, 6CNC operates a flexible precision manufacturing facility with more than 140 CNC machines. Our team supports customers worldwide with CNC milling, turning, 5-axis machining, mill-turn, grinding, inspection, finishing, and coordinated international delivery.
Is 6CNC Right for Your Project?
Our precision CNC machining service is best suited to custom, drawing-controlled parts where engineering response, flexible capacity, and inspection matter.
- Prototype and low-volume custom components
- Complex parts requiring multiple CNC processes
- Projects with defined critical dimensions or GD&T
- Metal and engineering-plastic components
- Parts requiring machining plus finishing
- International projects needing documented communication
For very high-volume commodity parts, casting, molding, stamping, or a dedicated production line may provide a better unit cost. We can help identify when CNC machining is the right bridge or production method.
From Drawing to Delivered Parts
Send Complete Files
Upload a 3D model and 2D drawing with material, quantity, tolerances, finish, and inspection requirements.
Engineering Review
We assess manufacturability, clarify CTQ features, and recommend practical changes where useful.
Quotation and Production Plan
You receive pricing, lead time, process assumptions, and any open technical questions.
Machining and Inspection
Parts are produced under the agreed revision and verified to the specified inspection scope.
Finishing and Delivery
Required secondary processes, final checks, protective packing, and worldwide shipping are coordinated.
Request a Precision CNC Machining Quote
Send your CAD files and drawing. Tell us which dimensions control fit, alignment, sealing, or performance, and our engineers will review the project for manufacturability, inspection, cost, and lead time.
Precision CNC Machining Services FAQ
What is precision CNC machining?
Precision CNC machining is subtractive manufacturing performed with controlled programming, fixturing, tooling, process conditions, and inspection to meet defined dimensional, geometric, and surface requirements.
What tolerances can 6CNC achieve?
Capability is confirmed feature by feature. Suitable features may reach very tight tolerances, but the achievable result depends on material, geometry, size, process, datum structure, and measurement method. Send your drawing for a specific assessment.
Do you offer both prototypes and production parts?
Yes. We focus on prototypes and low-volume production, including first articles, bridge quantities, and repeat small batches under controlled revisions.
Which files are needed for an accurate quote?
Send a 3D CAD model plus a dimensioned 2D drawing. Include material grade, quantity, critical tolerances, GD&T, threads, surface finish, treatment, and inspection or documentation requirements.
Can you provide CMM or First Article Inspection reports?
Yes, when included in the quotation scope. We select inspection methods according to feature geometry and reporting requirements.
How can I reduce the cost of a precision machined part?
Apply tight tolerances only to functional features, use clear datums, avoid unnecessarily deep pockets and small internal radii, select readily available material, and explain which features control assembly. A DFM review can identify the highest-cost requirements.
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