A short milling cutter above the pocket and mounting holes of a secured aluminum workpiece

CNC Milling Services

We mill housings, brackets and other custom parts with pockets, flat faces and hole patterns. Internal corners, wall thickness and the direction of each feature determine the tools and setups needed.

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ISO 9001 certifiedMade to your drawing · Hangzhou, China

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Pockets, holes and shared datums

Deep pockets and small internal corners restrict the cutter and can require a more slender tool. Thin walls need support during cutting. To reach another face, we may reposition the part using locating surfaces that preserve the dimensional references.

Size and workholding

Part and stock dimensions, clamping faces and tool clearance. Usable size depends on the fixture.

Pocket geometry and an end mill showing how depth and internal corner radii affect tool access

How your part shape guides milling

The surfaces that fit together establish the machining references. Their orientation and accessibility determine where we can hold the part and approach it with a cutter.

Pockets, slots and internal corners: Tool access and a usable corner radius; A rotating cutter leaves a radius at an internal corner. Where the design allows it, a more generous radius can give a larger tool room to work; deep, narrow features need a separate access review.
Thin walls or broad mounting faces: Support during cutting and measurement; Cutting and clamping forces can move a thin section. The machining sequence and support need to suit the part, especially where flatness or a mating face controls assembly.
Holes and pockets on several faces: Additional setups or multi-axis access; Changing the holding position opens access to another face. Select the locating method to preserve feature relationships, then choose indexed positioning or simultaneous motion from the cutting path.

Do all features need five-axis machining?

No. A part may use a three-axis setup, several setups or indexed positioning. The feature directions, contour and fixture clearance determine the route.

Can you machine sharp internal corners?

Milling leaves a radius at an internal corner. Specify the required corner geometry and any permitted radius so we can review the tool access and machining route.

One part, two milling setups

Top-face and side-face features can need different holding positions. When a drawing requires repositioning, we locate the next setup from the first machined surfaces to preserve the dimensional relationships.

D-shaped part lying flat in soft jaws with its top recess facing the milling spindle — Establish the first features
Choose stock and clamping faces so the initial pockets, bores and datum surfaces remain accessible.

D-shaped part standing upright in soft jaws to expose a perpendicular edge — Locate for the next setup
Use defined locating features when turning the workpiece to machine another face.

See the two-operation workshop record

Materials and finishing

Aluminum can suit housings where weight matters. Steel, stainless steel, copper alloys and polymers suit different service conditions and need different cutting and workholding plans. We review the exact grade and treatment for the part, including fitted dimensions in their final specified condition.

Material & specification	Finish / treatment	Part-specific requirements
Aluminum Specify alloy and temper; examples include 6061 and 7075.	Deburring, polishing, bead blasting or anodizing.	Mark protected fits and dimensions that apply after treatment.
Steel & stainless steel Specify the exact grade, stock condition and any heat treatment.	Machined surfaces, polishing or a compatible protective treatment.	Identify working interfaces, burr limits and required material records.
Copper & brass Specify the alloy and standard for contacts or fittings.	Polishing or compatible plating.	Define contact areas, threads and post-plating dimensions.
Engineering plastics Specify polymer grade, fillers and stock condition.	Machined surfaces with agreed edge quality and cleaning.	Include application conditions and the measurement state.

For titanium parts, include the grade and condition so we can review tooling, finishing and availability.

Material and finish checklist

Tolerances and inspection requirements

Selected critical features±0.01 mm

We review selected critical features at ±0.01 mm. The accepted tolerance for each feature depends on the drawing, material, geometry, setup and measurement method.

Feature	Drawing requirements	Inspection plan before production
Faces & mounting holes	Assembly datums, mounting faces, hole positions, bore fits and relationships between faces.	Measurement methods and recorded dimensions and positions referenced to the specified datums.
Pockets & thin walls	Pocket depths, minimum walls, internal radii, permitted tool access and any allowed radius or geometry changes.	Review distortion, tool marks and the limits required at critical sections.
Finish & protected areas	Finish, masking, cosmetic faces and dimensions that apply before or after treatment.	Acceptance stage and required finishing records, with separate procedures for cleanliness, chemical-contact or ESD tests.

White and turquoise bridge coordinate measuring machine with a probe above its granite table

Requirements for the application

Agricultural machinery: Include operating conditions with housing and bracket drawings. Shafts and their rotational features are reviewed through CNC turning.
Semiconductor equipment: Define cleanliness, chemical exposure and any ESD limits for equipment housings and interfaces. Specify the tests and documentation required for the application.

Any sector-specific qualification or testing needs to be specified and agreed for the order.

Examples of milled parts

Blocks, brackets and housings combine flat faces, pockets and holes. Their datums and tool access determine the setup sequence.

deep milled enclosure with side windows and threaded floor ports

Pocketed aluminum housings

Pocketed bodies with bores and mounting interfaces. Specify any lid, gasket and sealing-face requirements on the drawing.

Billet aluminum engine covers

A contoured cover with interfaces for assembly checks.

Request a CNC milling quote

If your specification is ready, include the details below. You can also start with a question.

Drawing & material

Current 3D model and drawing, part number, units and revision.

Material grade, stock condition and stock dimensions.

Geometry & setup

Mating features, datums, holes, thin walls and permitted geometry or radius changes.

Protected surfaces, known clamping or access restrictions, and intended assembly or operating conditions.

Acceptance & delivery

Finish, masking, post-treatment acceptance and any required tests or records.

Quantity, delivery destination and requested date.