Precision Bore Machining for Custom Aluminum Parts
Tight-tolerance internal features for bearing fits, pneumatic sealing, shaft alignment, and critical aluminum assemblies. CNCALPARTS combines high-speed milling, precision boring, and reaming to protect the dimensional integrity of your design.
±0.01 mm
Bore diameter tolerance
Ra 0.8 μm
Surface finish capability
3–5 Axis
CNC machining centers
Built around fit and alignment
Dedicated tooling and controlled machining parameters help maintain bore geometry through production, from a 5-piece prototype batch to a 500-piece run.
Engineering accuracy
Internal geometry that supports reliable assembly
Aluminum alloys such as 6061-T6 and 7075-T6 can expand under heat and respond to clamping stress. Our dedicated setups address those risks while boring, reaming, and finishing the features that determine fit and performance.
Dimensional accuracy
Hole diameter tolerances held down to ±0.01 mm for demanding fit requirements.
Geometric control
Roundness, cylindricity, and straightness suited to dynamic rotating parts.
Coaxial alignment
Multi-sided machining setups keep bores aligned across complex housings.
Surface integrity
Controlled feeds and finishing techniques achieve Ra 0.8 μm for lower friction and improved sealing.
Technical specifications
A machining range built for precision bores
CNC milling and dedicated boring bars support the rigorous requirements of robotics, automation, aerospace, and other applications where fitment is critical.
Material focus
6061, 6063, 6082, 7075, 2024, 5052, and 5083 aluminum alloys.
| Feature | Capability |
|---|---|
| Minimum hole diameter | Ø1.0 mm |
| Hole tolerance | Down to ±0.01 mm |
| Surface roughness | Ra 0.8–3.2 μm |
| Geometric tolerances | Flatness, parallelism, and position down to 0.02 mm |
| Equipment | 3-Axis, 4-Axis, and 5-Axis CNC machining centers |
Why specialization matters
Aluminum-only expertise for repeatable bore quality
Because we machine only aluminum, our workholding, coolant systems, cutting parameters, and inspection routines are optimized for the material.
Deformation control
Specific clamping strategies prevent thin-walled housings from egging or distorting after release.
Thermal management
Consistent machine temperatures and aluminum-specific lubricants help prevent oversize bores.
Production consistency
Documented and calibrated processes help the 500th part match the first.
Applications
Precision fitment across critical assemblies
Motor housings
Tight bearing fits that help reduce vibration and heat.
Pneumatic manifolds
Smooth, leak-free internal channels and valve bores.
Optical equipment
Precision bores for lens alignment and sensor housings.
Robotics
Structural components for press-fit bushings and dowel pin alignment.
Quality assurance
Inspection that verifies the features that matter
Every precision bore is verified before shipment from our Shenzhen facility, with documentation available for production and first-article requirements.
CMM inspection
Automated verification of hole position and geometric tolerances.
Bore and pin gauges
100% verification of critical diameters for production batches.
Surface testing
Interior finishes checked against sealing and friction requirements.
Full documentation
Dimensional Inspection Reports or First Article Reports available on request.
Common questions
Plan your precision bore project
Request a quote
Start your high-precision aluminum project
Share your design requirements with our engineering team. We provide faster design-to-production cycles and dependable bore quality for critical assemblies.
- 01Send your STEP/STP files and PDF drawings to info@cncalparts.com.
- 02Specify critical tolerances, bore fits, and surface requirements.
- 03Receive a manufacturability review and lead-time estimate.