Dongguan Precision CNC Factory

Precision CNC Machining
From Prototype to Production

One accountable partner from drawing review to finished part — machined aluminum and other metals, prototype or production run, checked in-house before it ships.

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✓ 5-axis Machining ✓ In-house Finishing ✓ Aluminum Specialists ✓ English-speaking PM
Multi-Axis CNC Machining

5-Axis & 4-Axis Machining
With In-house Inspection

CNC milling centers and Swiss-style / turn-mill turning for complex parts. Finished work is dimensionally checked on our optical measuring systems before shipment.

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✓ Turn-mill Capable ✓ Dimensional Inspection ✓ Anodizing On-site
Straight-Talking Factory

A Machining Partner That
Answers Honestly

We tell you clearly what we can hold and what we cannot. Multi-axis machining, finishing and inspection under one roof, with a single contact on every order.

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✓ Prototype to Production ✓ Factory-Direct Pricing
Welcome To OPTCJ

We Turn Your Drawings Into Parts That Fit the First Time

From CAD to prototype to production machining, OPTCJ is built to remove the friction between your design and a part you can actually assemble. Send us a STEP file and you get back a machined part, a DFM review, and a price — not a sales pitch.

What We Do

Prototyping and Production Under One Roof

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Rapid Prototyping

Your design does not need a tooling budget to become real. We machine prototypes in the material and process you intend to produce, so test results actually mean something. DFM feedback is included on every quote; lead time depends on the drawing.

📊

Production Machining

Once the design is frozen, we scale it with repeatable process controls and inspection at each step, so later batches match the approved first article.

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OPTCJ reception and front office
Complete Capabilities

One Machine Shop, Every Process Your Part Needs

Milling, turning, 5-axis, Swiss, EDM, finishing, and inspection — all in-house in Chang'an Town. Nothing gets brokered out to a shop we cannot audit.

Inside the OPTCJ machining workshop
Our Capabilities

Machining Processes We Run Every Day

CNC turning operation on the OPTCJ shop floor
01

CNC Milling

3-axis and 4-axis machining centers for brackets, housings, plates and enclosures, in aluminum and other metals.

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Precision CNC machined metal parts
02

CNC Turning

Standard and live-tool lathes up to Ø380 mm swing. Shafts, bushings, fittings and connectors turned complete in a single setup.

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Close-up of machined components
03

5-Axis Machining

Simultaneous 5-axis machining on our U400A center. Complex geometry, multi-face and thin-wall parts finished in one clamping.

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Machined components
04

Swiss & Precision Turning

Swiss-style and turn-mill lathes for long slender shafts and close-tolerance small parts, many finished complete in a single setup.

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Range of machined metal components in different alloys
05

Materials

Aluminum is our core — 6061-T6 most of all. We also machine stainless steel, brass and selected engineering plastics; ask about your material.

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Machined components staged before inspection
06

Finishing & Inspection

Anodizing, bead blasting, passivation and laser marking, then dimensionally checked in-house with inspection report on request.

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Choosing the Right Machining Partner

  • Straight answers: we tell you what we can hold, on your drawing, before you commit.
  • A single point of contact who knows your job, and technical questions answered by the person running it.
  • Factory-direct pricing from Chang'an Town — no trading company margin stacked on top.
  • In-house machining and inspection — no layer of subcontracting in the middle.
  • Inspection report on request with your shipment.
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Finished machined components at OPTCJ
By The Numbers

Scale You Can Schedule Against

5-axis & 4-axis machining centers ready for complex parts
U400A 5-axis machine in-house
Aluminum 6061-T6 prototyping
In-house anodizing & inspection
Product Development Process

Get the Right Part at Every Stage of Development

A one-off prototype and a larger production run need different processes and different economics. We support both.

01

Concept & Visual Models

Machine a real part in days so your team, your client or your investors can hold it. Real material beats a render every time.

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02

Functional Prototypes

Prototype in the production material and process, so fit, strength and thermal behaviour are tested honestly — not approximated.

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03

Engineering Validation

DFM feedback, tolerance stack review and revised drawings before you commit to tooling. Most cost is locked in before the first chip.

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04

Low-Volume Production

Flexible batch production without a hardened mould commitment, so you can change the design between runs while tooling stays economical.

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05

Full Production

Dedicated fixtures, optimised cycle times and in-process checks on critical dimensions, so every batch repeats the approved sample.

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06

Finishing & Assembly

Anodizing, plating, passivation, laser marking and sub-assembly, so parts arrive at your line ready to build.

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What We Machine

The Kinds of Parts We Make

Aluminum performance and electronics parts are at the core of what we do — 6061-T6, milled and turned, anodized and inspected in-house. Every project is quoted against your actual drawing.

Machined aluminum prototype parts
Materials

Aluminum 6061-T6, Our Daily Core

  • FitsPerformance & electronics parts
  • ProcessesMilling, turning, turn-mill
  • FinishesClear & color anodizing, bead blast
  • CheckIn-house optical measuring
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5-axis CNC machining of a complex part
Capability

5-Axis Complex Geometry, One Setup

  • MachineU400A 5-axis machining center
  • Ideal forMulti-face & 3D-contoured geometry
  • PrototypingNo tooling commitment
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Machined components staged before inspection
Turn-mill

Swiss-Style & Turn-Mill Turning

  • PartsLong slender shafts, small precision
  • AdvantageComplete in fewer operations
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Anodized aluminum parts
Finishing

Anodizing & Secondary Finishes

  • NaturalClear anodize
  • ColorColor anodize options
  • OthersBead blasting, laser marking
See finishing
Send Us Your Drawing
Industries We Serve

Parts That Have to Work, in Fields Where Failure Is Not an Option

Aerospace machined components

Aerospace

Titanium brackets, structural fittings, thin-wall housings.

 Automotive CNC machined parts

Automotive

Performance and sensor housings, brackets and mounts.

 Robotics components being machined

Robotics & Automation

Servo flanges, end-effectors, precision linkages.

 Electronics heat sink and connectors

Electronics

Copper heat sinks, RF enclosures, connector bodies.

 Industrial equipment manufacturing

Industrial Equipment

Fixtures, jigs, gauges and replacement components.
We hold our own tolerances and finishes on every part. Ask for our inspection report approach and you will see exactly how each dimension was measured before it shipped.
The OPTCJ Team
In-house engineering & quality
How It Works

Start Your Machining Project in 4 Steps

1

Send Your Files

Upload STEP, IGES or PDF drawings with material, quantity and tolerance requirements.

2

Quote + DFM Review

You get a price, a lead time and honest DFM feedback on machinability — we quote against your real drawing.

3

Production & QC

Your part runs on the right machine and is dimensionally checked in-house before it goes out.

4

Delivery

Parts packed to your spec, shipped with inspection reports and material certs.

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Insights

Machining Notes From the Shop Floor

Process guides, tolerance advice and material notes written by the engineers who run the machines.

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Have a Part to Machine?

Send us your drawing and requirements for a quote, a lead time and DFM feedback — no obligation.

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