4 Axis CNC Milling Service
From intricate spiral grooves and curved profiles to complex cylindrical features. We deliver continuous 4-axis CNC milling that bridges the gap between 3-axis limitations and high 5-axis costs, bringing your toughest designs to life.
One-Stop Solutions from 4-Axis CNC Milling Service
At Xtproto, our high-precision 4-axis CNC milling services are engineered to tackle your most complex designs with maximum speed and efficiency. By rotating parts on a synchronized 4th axis, we machine intricate, multi-sided geometries in a single setup—slashing lead times, eliminating manual positioning errors, and lowering your costs compared to standard 3-axis milling.Backed by an expert engineering team, we offer seamless, one-stop manufacturing that covers everything from rapid prototyping and high-volume production to post-processing and final component assembly. No matter how challenging your project is, we deliver complete, high-tolerance components ready for your production line.
What is 4-Axis Milling?
4 axis milling adds a rotational axis (typically around the X-axis, known as the A-axis) to standard 3-axis milling. This allows the fixture to rotate the workpiece, presenting multiple faces or part features to the cutting tool in a single setup. By reducing manual repositioning, 4-axis machining improves feature alignment, increases machining efficiency, and delivers better consistency for complex parts with angled surfaces, holes, and multi-side features.
3-Axis Milling vs 4-Axis Milling
| Feature | 3-Axis Milling | 4-Axis Milling |
| Machining Movement | X, Y, Z linear movement | X, Y, Z movement + rotational axis |
| Workpiece Access | Mainly top-side machining | Multiple sides through rotary positioning |
| Setup Requirements | More repositioning for complex parts | Fewer setups with improved alignment |
| Part Complexity | Best for simple pockets, slots, and flat features | Ideal for angled surfaces, side features, and multi-face machining |
| Accuracy | Depends on manual repositioning | Improved positional consistency between features |
| Production Efficiency | Lower for multi-side parts | Faster cycle times for complex geometries |
Our Engineers for 4 Axis Milling
In our 4-axis milling service, our engineers are the critical link between your blueprints and high-precision finished parts. We boast a highly skilled CNC machining team, with 80% of our members being seasoned technical experts capable of solving the most complex and precise machining challenges.By leveraging their expertise to optimize 4-axis processes, we help you significantly reduce production costs and boost your market competitiveness. Our engineering team is dedicated to delivering top-tier custom 4-axis machined parts with the most competitive pricing and the shortest lead times—backed by our 100% free repair or rework guarantee on any defective parts.
Our 4-Axis CNC Milling Capabilities
We machine components up to 800mm in diameter and 1500mm in length, delivering true continuous 4-axis linkage for complex rotary geometry. Our indexing precision reaches 0.001°, keeping feature positioning within ±0.005mm and linear tolerances within ±0.01mm. We process standard, hardened, and engineering materials to a consistent Ra 0.8 finish straight from the machine. Every program runs through full CAM kinematic simulation to ensure zero-defect, collision-free production.
4 Axis CNC Milling Specifications
- Surface Finish: Down to Ra 1.6 μm standard finish, with precision capabilities reaching Ra 0.8 μm straight off the machine.
- Maximum Part Size: Up to Ø800 mm diameter and 1500 mm length, depending on part geometry.
- Minimum Part Size: Diameter as small as 5 mm, depending on material and design requirements.
- Tolerance: Standard accuracy of ±0.01 mm, with precision capabilities down to ±0.005 mm.
- Lead Time: Prototype machining in 1–7 business days; small-batch production in 5–10 business days.
Advanced 4-Axis Milling
When milling long enclosures, structural channels, or slender components with high aspect ratios, standard machining often triggers severe workpiece deflection and chatter marks due to lateral cutting forces. Our specialized 4-Axis CNC Milling Service solves this challenge through strategic rigid set-ups and dynamic tool-path optimization. By utilizing synchronized continuous A-axis rotation and precise rotary supports, we maintain uniform torsional rigidity across the entire length of the part. This prevents the workpiece from sagging or flexing away from the milling cutter, allowing us to machine deep pockets, long slots, and complex profiles with consistent depth and immaculate surface finishes. We deliver long-format milled components that remain perfectly straight and distortion-free, saving you from costly post-machining straightening processes.
Facility for 4 Axis Milling
As the bedrock of our 4-axis milling service, we operate a massive, modern manufacturing facility spanning a total of 160,000 square feet. This factory provides us with a fully integrated supply chain, running seamlessly from raw material staging and high-tech testing to precision quality control.Our 4-axis milling workshop a premium fleet of world-class Haas and Mazak 4-axis CNC mills. Every 4-axis center utilizes automated rotary tables and Renishaw probes, maintaining a strict ±0.005mm tolerance verified by our CMM inspection.Backed by the sheer capacity of our facility, we effortlessly support everything from prototyping to continuous, large-scale contractual manufacturing with flawless stability.
4-Axis Milling Quality Control & Documentation
Every 4-axis milled part is verified through strict inspection processes and delivered with complete quality documentation to ensure dimensional accuracy, feature consistency, and full traceability.
Complete Quality Documentation
Each order includes the inspection records and certifications required for your quality control process.
- Dimensional Inspection Reports
- Material Certificates with Batch Traceability
- First Article Inspection (FAI) Reports
- Certificate of Conformance (CoC)
Precision Verification with CMM Inspection
Before shipment, every 4-axis machined component undergoes dimensional verification to confirm critical features and multi-side accuracy.
- 100% CMM inspection available for critical parts
- NIST-traceable calibrated measurement equipment
- Standard tolerances down to ±0.01mm, precision requirements up to ±0.005mm
- Inspection reports provided with every qualified order
4-Axis Milling Accuracy
Our inspection process ensures accurate positioning across multiple machining angles, maintaining consistency for complex features and tight-tolerance components.
- Multi-side feature verification after indexed rotations
- Custom fixture validation for repeatable positioning
- Accurate machining of angled holes, side features, and complex contours
- DFM review to optimize manufacturability before production
4-Axis Milling Quality Standards
We strictly adhere to ISO 9001 and AS9100 quality management systems. Through standardized production processes and continuous quality control, we ensure that every 4-axis milled part meets rigorous standards for precision and reliability.
Materials for Four Axis Milling
We offer a wide range of material options for 4-axis milling; please feel free to contact our engineers if you require other special materials.
Lightweight, corrosion-resistant, and highly machinable for precision CNC parts.
Common Grades
6061 / 6061-T6 · 7075 / 7075-T6 · 2024 · 5052 · 5083 · 6063 · 6082 · ADC12 (A380)
Lead Time
~5 Business Days
Strong, corrosion-resistant, and ideal for precision CNC machining.
Common Grades
304 · 316L · 303 · 17-4PH
Lead Time
~7 Business Days
Excellent machinability and attractive surface finish for precision CNC components.
Common Grades
C360 · C260 · C280
Lead Time
~5 Business Days
Strong and cost-effective for a wide range of CNC machined parts.
Common Grades
1018 · 1020 · 1045 · A36
Lead Time
~7 Business Days
Excellent electrical and thermal conductivity for precision CNC components and heat-transfer parts.
Common Grades
C110 · C101 · C102
Lead Time
~7 Business Days
Bronze offers excellent wear resistance and low friction, ideal for bearings, bushings, and moving components.
Common Grades
C932, C954, C836
Typical Lead Time
~7 business days
High rigidity and excellent vibration damping for heavy-duty CNC components.
Common Grades
Cast Iron · Ductile Iron
Lead Time
~7–10 Business Days
Steel is a versatile CNC machining material that delivers strength, durability, and flexibility across a wide range of industrial applications.
Common Grades
4140,4130 ,Mild Steel ,Tool Steel
Typical Lead Time
~7 business days
Versatile and impact-resistant thermoplastic for functional prototypes and industrial CNC components.
Common Grades
Standard ABS · ABS-M30 · ABS+
Lead Time
~5 Business Days
High optical clarity and UV resistance for transparent CNC parts and display applications.
Common Grades
Cast PMMA · Extruded PMMA
Lead Time
~5 Business Days
PC is a strong, transparent engineering plastic with high impact resistance and heat resistance, ideal for durable functional prototypes.
Common Grades
Standard PC ,PC-ABS blend
Typical Lead Time
~5 business days
POM provides excellent dimensional stability, low friction, and wear resistance, making it ideal for gears, bearings, and precision mechanical parts.
Common Grades
Delrin® 500,Acetal Copolymer
Typical Lead Time
~5 business days
PE is lightweight, chemically resistant, and easy to machine, suitable for containers, insulation parts, and general prototypes.
Common Grades
HDPE, LDPE ,UHMWPE
Typical Lead Time
~5 business days
Strong and wear-resistant engineering plastic for functional CNC parts such as gears, bushings, and mechanical components.
Common Grades
PA6 · PA66 · Glass-filled PA
Lead Time
~5 Business Days
High-performance polymer with excellent thermal stability, chemical resistance, and mechanical strength for demanding CNC applications.
Common Grades
Unfilled PEEK · Carbon-filled PEEK · Glass-filled PEEK
Lead Time
~7 Business Days
Excellent chemical resistance and low friction for seals, gaskets, and sliding CNC components.
Common Grades
Virgin PTFE · Filled PTFE
Lead Time
~5 Business Days
Surface Finishing for 4 Axis Milling Parts
We offer a variety of surface treatments for 4-axis milling; please contact us if you have any other specific requirements.
Why Choose Xtproto for 4 Axis Milling Services?
- Dedicated 4-Axis Milling Expertise: Extensive experience in precision CNC 4-axis milling for complex and high-accuracy components.
- Advanced Machining Equipment: Equipped with advanced CNC machining centers and CMM inspection systems to meet tight tolerances.
- Fast Quote Response: Get a response within 24 hours and detailed quotations within 48 hours after submitting drawings.
- ISO 9001 & AS9100 Certified Quality: Certified quality systems ensure reliable machining standards and consistent part quality.
- Flexible Production Support: No minimum order requirements, supporting prototypes, low-volume runs, and production manufacturing.
From CAD File to Shipped Parts
Your CAD files are transformed into production-ready components through a streamlined 4-axis milling process focused on speed, accuracy, and reliability.
The 4 Axis Milled Parts We Manufacture
- Housings
- Brackets
- Manifolds
- Valve Bodies
- Mounting Plates
- Fixtures
- Jigs
- Shafts
- Flanges
- Impellers
- Gear Components
- Custom Mechanical Parts
- Heat Sinks
- Motor Housings
- Pump Bodies
- Connector Blocks
- Adapter Plates
- Base Plates
- Retainer Rings
- Coupling Components
- Cam Components
- Structural Components
- Tooling Plates
- Precision CNC Parts
- Covers
- Frames
- Clamps
- Mounting Blocks
- Motor Brackets
- Bearing Housings
- Spacers
- Bushings
- Rotors
- Shafts Couplings
- Chassis Components
- Custom Machined Parts
FAQ
Do you offer prototyping and mass production services?
Can 4-axis milling shorten lead times?
What is the cost and lead time for 4-axis CNC milling?
What file formats do you accept?
Can Xtproto machine complex alloys using 4-axis equipment?
How do I get a quote for 4-axis CNC milling?
Get Started with Xtproto 4-Axis Milling Services
Xtproto delivers precision 4-axis CNC milling solutions for complex components requiring accuracy, consistency, and reliable production. With advanced machining capabilities, strict quality control, and value-added services, we support projects from prototypes to production. Contact us today for a fast quote and bring your designs to life.