CNC machining since 2008 · 3D printing since 2017

FINISHING & POST-PROCESSING / COMPARE ALL

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Choose the finish.

Compare the original surface and the finished result before choosing a finishing route.

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THE FINISHING OPTIONS

CNC Machining finishes.

Black colour appearance simulation on the same CNC component
Silver CNC component
SILVERBLACK
Black

01 / CNC Machining

Anodising

Explore colour appearance for suitable aluminium components.

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Normal CNC machined steel surface
Mirror polished steel surface
Normal machinedMirror polished

02 / CNC Machining

Polishing

Agree the appearance and measurable surface requirements.

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Bead-blasted finish
As-machined finish
AS MACHINEDBEAD BLASTED

03 / CNC Machining

Bead blasting

Discuss a consistent texture and protected interfaces.

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CNC stainless steel housing passivation; minor difference illustrates pre-cleaning only, not measured passivation performance
CNC stainless steel housing before-treatment
BEFORE TREATMENTPASSIVATED

04 / CNC Machining

Passivation

Review suitability for the selected stainless steel and specification.

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CNC steel clevis fixture with black oxide finish
As-machined CNC steel clevis fixture
AS MACHINEDBLACK OXIDE

05 / CNC Machining

Black Oxide

It creates a deep black finish on steel, with minimal dimensional change and added corrosion protection when sealed.

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Brushed CNC aluminium mounting plate finish
As machined CNC aluminium mounting plate finish
AS MACHINEDBRUSHED

06 / CNC Machining

Brushing

It creates a fine, directional grain for a refined satin metallic finish.

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Nickel plated CNC brass valve manifold electroless nickel finish
As machined CNC brass valve manifold electroless nickel finish
AS MACHINEDELECTROLESS NICKEL

07 / CNC Machining

Electroless Nickel Plating

Adds a uniform nickel layer for improved wear and corrosion resistance.

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Yellow powder-coated CNC aluminium enclosure finish; bare-metal bores illustrate masking
As-machined CNC aluminium enclosure finish
AS MACHINEDPOWDER COATED

08 / CNC Machining

Powder Coating

Adds a durable coloured coating for a uniform finish and improved corrosion resistance.

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Material compatibility and further operations
Home → / Finishes / CNC machining
Finishes / CNC machining

CNC machining finishing & secondary operations

Options for cnc machining. The exact material, geometry and required result determine compatibility.

Operations to discuss for CNC machining

This is a process-specific shortlist, not a finishing package. Read each material condition; not every option applies to every grade. The quotation defines the agreed operations.

Sanding and hand finishing

Material condition: Selected metal parts. Cosmetic grade and edge preservation defined at quotation

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Polishing

Material condition: Stainless steel, aluminum, titanium and copper. Manual, mechanical or project-specific polishing route

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Painting / spray coating

Material condition: Available after suitable preparation. Color reference, gloss and texture required

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Vacuum metallization / plating

Material condition: Selected metal plating routes. Substrate and performance requirements must be reviewed

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Anodising

Material condition: Aluminum after compatible machining/finishing. Printed alloy and surface condition affect appearance

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Passivation

Material condition: Stainless steel. Standard and certification requirements quoted separately

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Threading and inserts

Material condition: Tapping, inserts and machined threads. Thread class and insert specification required

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Welding and assembly

Material condition: Welding and segmented-part joining. Joint location and distortion risk reviewed during DFM

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Silk screening / marking

Material condition: Selected coated metal surfaces. Artwork and adhesion requirements required

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Inspection and documentation

Material condition: Dimensional report and material documentation on request. Scope, sampling plan and certificate type quoted separately

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A FEW USEFUL ANSWERS

Finishing FAQs.

Practical questions about CNC Machining finishing, samples and specifications.

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How do I choose between anodising and powder coating?

Anodising forms an oxide layer on suitable aluminium. Powder coating adds a cured coating to compatible metals. Choose around the material, appearance, wear requirements, coating thickness and electrical contact areas.

Does passivation make stainless steel shinier?

Passivation is primarily a chemical cleaning and corrosion-resistance treatment. It normally produces little visible change. Specify polishing separately if you need higher gloss or smoother surfaces.

Can I combine more than one finishing process?

Yes, where the material and geometry allow. The order matters: for example, smoothing may precede painting or coating. Identify the required result and protected surfaces so the complete route can be reviewed.

What should I include with my enquiry?

Send the 3D CAD model, any 2D drawing and the parts list. Include the material, quantities, target appearance, colour reference, roughness requirements, masked areas and critical dimensions.

Will finishing affect the dimensions?

It can. Material removal, coating buildup or thermal processing may affect dimensions and edges. State whether tolerances apply before or after finishing and identify mating faces, bores and threads.

Can I approve a finish sample before a batch?

Request a representative sample during quotation when colour, texture or gloss is critical. The sample scope, cost and timing are agreed for the project.

Is every listed option suitable for every material?

No. Compatibility depends on the exact grade, geometry, surface access and intended use. The quotation confirms which operations are included and any sample approval required.

Christina, Director of Sales at CK

Need help choosing a finish for your project?

Speak with Christina, our Director of Sales, about finishing options that match your material, surface requirements and intended use.

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