5-Axis CNC Machining for 7075 Aluminum Structural Parts

This project involved a set of 7075 aluminum components for mechanical equipment, produced in a batch of approximately 150 pieces and shipped to Switzerland.
Each part is approximately 280 × 80 mm, with key dimensions specified to ±0.05 mm.
The geometry is built around large semicircular mating profiles, with bores, mounting bosses, side holes, recessed areas and reference surfaces distributed around the component. These features are machined from different directions but ultimately need to work together in the customer's assembly.
For this reason, we used 5-axis CNC machining to improve access to the multi-sided geometry and reduce unnecessary repositioning during production.
 

Project Details

Large Curved Mating Profiles Are the Main Feature

The semicircular machined areas are the most distinctive part of this design.
Based on the geometry, these surfaces appear to locate, support or mate with another component inside the mechanical assembly. Around them are several bores, bolt holes, raised bosses, mounting faces and other locating features.
This creates an important machining consideration: individual dimensions cannot always be viewed independently.
A bore may be within size tolerance, for example, but its position relative to the curved profile or mounting datum can still affect assembly.
The machining and inspection strategy therefore needs to follow the relationships defined in the customer's drawing, particularly between the mating surfaces, datums, bore locations, hole patterns and mounting faces.
 

Why This Part Benefits from 5-Axis Machining

Important features are located on several sides of the component.
The large curved profiles, side holes, bores and mounting features require different tool approach directions. Producing them through multiple independent setups would add repositioning and make fixture planning more complicated.
With 5-axis CNC machining, the workpiece can be oriented to provide better tool access to these features while keeping more of the machining within a controlled setup.
For this component, the value of five-axis machining is therefore practical: it helps manage multi-directional features and their positional relationships.
It is not simply a matter of using a five-axis machine because the part looks complex.
 

Machining the Part from 7075 Aluminum

7075 aluminum is commonly specified for mechanical components where high strength and relatively low weight are required.
In this project, the component is machined from solid stock. Considerable material is removed to create the internal open areas, curved profiles, recessed regions and mounting geometry visible in the finished part.
That material removal needs to be considered when planning the machining sequence.
Rather than completing every critical feature as early as possible, rough machining can first establish the general form while maintaining sufficient support for later operations. Functional mating and locating features can then be finished under more stable conditions.
This is particularly relevant when a component combines large material removal with multi-sided precision features.
 

Keeping Critical Features Consistent Across 150 Parts

The key drawing dimensions for this project are controlled to ±0.05 mm.
The tolerance itself is not unusually tight for CNC machining. The more meaningful requirement is reproducing the required dimensions and feature locations consistently across approximately 150 components.
For this type of part, critical characteristics may include:

• curved mating dimensions;
• bore diameters;
• hole locations;
• distances between related features;
• mounting heights;
• reference surfaces.

Once production begins, fixture repeatability and tool condition become increasingly important.
In-process dimensional checks can also help identify changes before the complete batch has been machined. This is especially useful when several features must remain correctly located relative to a common datum or mating surface.
 

Datum Relationships Can Determine Whether the Part Fits

The 3D model shows the complete shape of the component, but the 2D drawing defines which dimensions and relationships control the part.
This distinction matters for mechanical components like these.
A curved surface, bore and mounting face may all be individually acceptable, yet the assembly can still be affected if their positional relationship is incorrect.
Before machining, we therefore review the customer's CAD data together with the drawing to understand:

• which surfaces establish the datums;
• which bores or holes are functionally related;
• which areas mate with other components;
• which dimensions are important for assembly;
• how those features can be inspected during production.

If a drawing requirement is unclear, resolving it before the full production run is preferable to discovering the problem when the parts reach assembly.
 

From Machining the First Part to Producing the Batch

Making the first acceptable component establishes the basic machining route. Producing another 149 parts requires that route to remain repeatable.
For the batch, workholding, tool access, machining sequence and dimensional checks need to be practical enough to use consistently throughout production.
This is one reason small-batch CNC machining differs from one-off prototype work.
The supplier needs to consider not only whether the geometry can be machined, but whether the same process can continue to produce acceptable parts without unnecessary setup variation or inspection problems.
For customers developing mechanical equipment, this type of low-volume CNC production can bridge the gap between prototype validation and higher-volume manufacturing.
 

What Matters When Sourcing a Part Like This?

For a component with mating surfaces and multi-directional features, a useful quotation involves more than machine time.
Before pricing and production, it helps to understand the material, quantity, critical dimensions, datum structure, finishing requirements and inspection expectations.
This allows the machining approach to be considered before the order reaches the shop floor.
For purchasing teams, the practical questions are usually straightforward:
Can the supplier machine the complete geometry?
Can the critical feature relationships be inspected?
Can the same process be maintained across the batch?
Can the parts be delivered to the required specification and schedule?
These points are particularly relevant when the machined component will go directly into another mechanical assembly.
 

Custom 7075 Aluminum CNC Machining Services

YS Precision provides 7075 aluminum CNC machining services for custom components manufactured according to customer drawings.
We support machining requirements including:

• 5-axis CNC machining;
• custom 7075 aluminum parts;
• multi-sided machining;
• curved mating profiles;
• precision bores and hole patterns;
• low-volume CNC machining;
• small-batch production;
• dimensional inspection.

In addition to 7075, we machine Aluminum 6061 and 6082, stainless steel, titanium, steel, brass, copper and engineering plastics.
Projects are produced from customer-supplied 3D CAD files and 2D drawings, with surface finishing and inspection arranged according to the actual part requirements.
 

Request a Quote for 7075 Aluminum CNC Machining

If you are looking for a 7075 aluminum CNC machining manufacturer, 5-axis CNC machining supplier or custom aluminum parts manufacturer, send us your drawings for review.
For an RFQ, please provide:
3D CAD + 2D Drawing + Material Grade + Quantity + Critical Tolerances + Surface Finish + Inspection Requirements
For parts with mating geometry, marking the critical datums, bores, hole positions and assembly-related surfaces helps us understand which relationships require the closest attention during machining and inspection.
Send your 7075 aluminum part drawings to YS Precision for manufacturing review and quotation.