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Custom CNC Machining of Aluminum 7075 Robot Arm Linkages

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Custom CNC machined 7075-T6 aluminum collaborative robot arm components with topology-optimized cutouts for lightweight strength

This is a custom CNC machining of collaborative robot arm components for an industrial automation client. The main goal was to produce lightweight, high-strength aluminum arms that could handle repeated motion and payloads in a cobot work environment. CAD model featuring a topology-optimized design. To achieve the required strength-to-weight ratio, the design incorporates a complex truss-like structure with deep, triangular pocketing throughout the main body.

This custom CNC machined component is manufactured from aluminum 7075-T6. As an aerospace-grade alloy, 7075-T6 provides a yield strength comparable to certain steels at a fraction of the weight, making it highly suitable for robotic components subjected to repetitive dynamic loads.

We reviewed the 3D CAD files of the custom cobot arm to evaluate the manufacturability of all features, including complex cutouts and mounting points, could be machined on our 5-axis equipment. 7075-T6 aluminum blanks were machined on a 5-axis CNC mill. This allowed all curved profiles and triangular cutouts to be completed in one setup, reducing alignment errors and improving consistency across the production run.

Following the machining phase, the parts underwent deburring to ensure all sharp edges from the intricate pocketing were smoothed for safe handling and wire routing. Dimensional accuracy, specifically the flatness of the mounting plates and the alignment of the pivot holes, was verified using CMM (Coordinate Measuring Machine) inspection prior to dispatch. The batch of parts fully meets the tolerance requirements and was delivered on time.

Project Details

Part type: Custom Collaborative Robot Joint Arm

Material: Aluminum 7075-T6

Machining Process: 5-Axis CNC Milling

Surface Finish: As-Machined

CNC Machining for Robot Parts

By enforcing strict geometric tolerances like flatness, parallelism, and perpendicularity, we manufacture components that ensure flawlessly smooth articulation and system stability. From your initial R&D prototypes to final market launch, we deliver the precision your diverse projects require.

Free Quote & Design Review

We provide custom CNC machining services for low-volume production and Rapid Prototyping for design verification.  Click Here to Upload Your CAD Files

Our Manufacturing Capabilities

5-axis CNC milling machine cutting an aluminum block during the manufacturing process.

Capabilities include 3-Axis, 4-Axis, and 5-Axis CNC Milling, as well as CNC Turning operations. Standard materials processed include Aluminum alloys, Stainless Steel, Titanium, etc. and Engineering Plastics. Available secondary operations include Anodizing, Powder Coating, Bead Blasting, and Laser Engraving.

Capacity supports requirements ranging from single-unit Rapid Prototyping to Low-Volume Production runs (1-1,000+ units).

Factory Quality Assurance

A highly accurate ZEISS Coordinate Measuring Machine (CMM) inspecting the internal dimensions and tight tolerances of a custom CNC machined component.

A standardized Quality Management System (QMS) is applied to all manufacturing orders, regardless of part complexity or production volume. The following inspection stages are mandatory for every CNC machining project:

  • Material Verification: Raw material certification (chemical composition and mechanical properties) is verified upon receipt to ensure compliance with material specifications.

  • First Article Inspection (FAI): The first unit from any production run undergoes a full dimensional report to validate the machining setup and programming before volume processing begins.

  • In-Process Monitoring: Periodic checks are conducted during the machining cycle to monitor tool wear and ensure dimensional consistency is maintained throughout the batch.

  • Final Inspection: Completed components undergo a final dimensional and cosmetic verification using CMM (Coordinate Measuring Machine) and calibrated manual instruments prior to packaging.

Order Fulfillment Process

Finished CNC machined components securely packaged in custom foam inserts for global shipping.

From CAD to part.

Step 1: Upload & Quote

Upload your CAD files (.step) to our secure platform. Receive a detailed CNC quote and lead time estimate within 24 hours.

Step 2: Free DFM Review

Our engineers conduct a Design for Manufacturability (DFM) analysis to optimize your design for rapid machining and reduce costs.

Step 3: Precision Machining

We ensure your custom CNC parts meet strict tolerance requirements.

Step 4: Quality Control

Every part undergoes rigorous inspection before leaving our factory to ensure it matches your specifications perfectly.

Step 5: Fast Delivery

We ship globally using major carriers (DHL, FedEx, UPS). Get your CNC prototypes delivered to your door in as little as 7 days.

FAQs About CNC Machining Services

No. We support projects of all sizes, from a single prototype unit to low-volume production runs.

Standard lead times are typically 10–15 business days. Expedited services (Rapid Prototyping) can be completed in as little as 3–5 business days, depending on part complexity and material availability.

In most cases, we source materials from our approved suppliers to ensure quality control. However, we can machine customer-supplied materials for specialized alloys or specific requirements upon engineering review.

Unless otherwise specified, our general tolerance standard is ISO 2768-m (±0.125 mm) for metals and ±0.25 mm for plastics. Precision tolerances ±0.005 mm are achievable but must be explicitly stated in 2D technical drawings.

Our facility can accommodate parts up to 4000 x 1500 x 600 mm for milling and Ø200 mm x 500 mm for turning.

Yes. We can install inserts (e.g., Helicoils, PEM fasteners) and perform basic mechanical assembly of machined components prior to shipment.

To provide an accurate quote, we require a 3D CAD file (.step). If the part has threaded holes, tight tolerances, or specific surface finish requirements, a 2D PDF drawing must also be provided.

Not a problem at all. If you don’t have a 3D design, simply share your concept or requirements with us. We work with experienced partnered product designers who can help convert your ideas, hand-drawn sketches, or reference images into professional, manufacturing-ready 3D models.

Please note that 3D modeling services are subject to an additional design fee based on part complexity.

Absolutely. We offer full reverse engineering services for existing parts. Simply mail us your sample, and our engineering team will take care of the rest — from precise measurement and 3D modeling to final CNC production.

We take IP protection seriously. All files are stored securely, and we are willing to sign a Non-Disclosure Agreement (NDA) prior to receiving your data.

Yes. We can provide material certificates (COA) and dimensional inspection reports upon request. Please specify this requirement when placing your order.

We ship globally using major carriers (DHL, FedEx, UPS).

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