Precision Machining Service from a Trusted China Manufacturer

We machine tight-tolerance metal and plastic parts that fit the first time. As a China precision machining manufacturer and supplier, our factory holds tolerances down to ±0.005 mm with CNC milling, turning, wire EDM, and grinding. Upload your CAD file and get a factory-direct quote with free DFM feedback within 24 hours.

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ISO 9001 Certified Factory Quote in 24 Hours NDA Protected Free DFM Feedback

The Problem We Solve

Why Machined Parts Come Back Wrong

These are the problems buyers tell us about every week. Here is how we take each one off your desk.

Parts Miss the Tolerance

A few microns off and your part will not assemble. We hold ±0.005 mm as standard and measure critical features with CMM before shipping.

Bad Surface Finish

Tool marks, chatter, and burrs ruin fit and looks. We set the right speeds, use the right cutters, and deburr every edge.

Deadlines Keep Slipping

Late parts delay your build and cost you sales. We confirm a firm date with your quote and update you at every stage.

Hidden Costs After Ordering

Cheap quotes often grow after you pay. Our quote is itemized and final, with no surprise charges for setup, tooling, or packing.

Slow Replies and Confusion

Weeks of silence and unclear answers waste your time. You get one dedicated engineer who replies within hours.

Worried About Your Design

Sending files to a new supplier feels risky. We sign an NDA before you share anything, and your design and drawings stay yours.

Precision Machining at YiguProto China factory
Programming, machining, and inspection under one roof at our Dongguan, China factory

Our Solution

One China Manufacturer, One Accountable Partner

YiguProto is a precision machining company based in Dongguan, China. We own our CNC shop, our metrology lab, and our finishing lines. That means no middleman, no markup, and no finger-pointing.

From your first CAD file to the last shipped carton, one team handles design review, programming, machining, inspection, and delivery. You always know who to call.

  • Free DFM review on every quote
  • Tolerances to ±0.005 mm as standard
  • ISO 9001:2015 certified factory
  • Inspection report (FAI / CMM) with each order
  • CNC milling, turning, EDM, and grinding in one shop
  • English-speaking engineers, replies within hours
Upload Your File & Get a Quote Ask an Engineer

Overview

What Is Precision Machining?

In plain words: a computer-controlled cutter removes material from a metal or plastic block until the part matches your drawing. Precision machining means the part is accurate to a few microns, again and again.

Standard fabrication cannot hold these numbers. Precision CNC machining can. A program (G-code) controls every movement of the tool, so there is no operator variation and every part in a run is the same.

That repeatability is why precision machining is used for aerospace parts, medical instruments, and industrial machinery, where a failed part is not an option. Our shop runs 3, 4, and 5-axis mills, CNC lathes with live tooling, wire EDM, and surface grinders to cover the full range of work.

What precision machining gives you:

  • Repeatable dimensions, part after part
  • Strong parts from solid metal, not glued or layered
  • Tight fits for shafts, bores, and threads
  • Complex shapes cut in one setup with 5-axis
  • Surface finishes from as-machined to mirror polish

When to Choose Precision Machining

Good fit if you need:

  • ✓ Tight tolerance on critical features
  • ✓ Strong parts from metal or hard plastic
  • ✓ One-off prototypes up to large runs
  • ✓ Aerospace, medical, or industrial use

Consider another process if:

  • ✗ You need very high volume at the lowest cost
  • ✗ Your design still changes every week
  • ✗ Hollow or lattice shapes only 3D printing can make

Capabilities

Precision Machining Capabilities at a Glance

Real numbers, so you can spec your part with confidence.

.005

Tolerance

±0.005 mm (±0.0002 in) as standard. Down to ±0.001 mm on critical features.

Ra

Surface Finish

Ra 3.2 µm as machined. Down to Ra 0.4 µm with fine machining, grinding, or polishing.

5

Machining Axes

3, 4, and 5-axis milling, plus mill-turn lathes with live tooling.

1200

Work Envelope

Milling up to 1,200 × 600 × 500 mm. Turning up to Ø 500 × 1,000 mm.

50+

Materials

Aluminum, steel, stainless, titanium, brass, copper, Inconel, POM, PEEK, and more.

CMM

Inspection

CMM, optical comparators, micrometers, pin gauges, and hardness testers in-house.

3d

Lead Time

Most parts ship in 3 to 8 business days after quote approval.

1+

Volume

From 1 prototype part to 100,000+ pieces. No strict MOQ.

Our Solutions

Precision Machining Solutions for Every Part

From a single prototype to full production, we match the process to your part, your material, and your budget.

CNC Milling

3, 4, and 5-axis  |  Pockets, slots, contours

Rotating cutters shape flat and complex faces. 5-axis cuts angled features in one setup for better accuracy.

CNC Turning

Lathes with live tooling  |  Round and shaft parts

The part spins while the tool cuts. Ideal for shafts, bushings, and fittings with tight diameters and threads.

Wire EDM

Thin wire  |  Hard metals, sharp corners

A thin wire cuts hard steel with no cutting force. Great for sharp internal corners and hardened parts.

Surface Grinding

Flat and parallel  |  Hardened parts

An abrasive wheel gives flat surfaces and tight flatness. Often the last step after heat treatment.

5-Axis Machining

One setup  |  Complex geometry

Cut five faces without re-clamping. Fewer setups mean tighter tolerance and shorter lead time.

Prototype & Low Volume

1 to 500 parts  |  Same tolerance as production

Get real machined parts in the final material for testing, with the same accuracy as a full production run.

Materials

50+ Metals and Plastics, Ready to Machine

We machine the materials your application actually needs. Need something special? Just ask and we will source it.

Aluminum

  • 6061 — all-round, easy to machine
  • 7075 — high strength, aerospace
  • 2024 — strong, fatigue resistant
  • 5052 — corrosion resistant

Steel & Stainless

  • 303 / 304 / 316 — stainless grades
  • 17-4 PH — strong, corrosion resistant
  • Mild steel — CRS, HRPO, HRS
  • Alloy & tool steel — wear resistant

Titanium & Exotics

  • Ti-6Al-4V — light and very strong
  • Inconel — high heat resistance
  • Nickel alloys — corrosion resistant
  • Brass & copper — conductive, easy to cut

Engineering Plastics

  • POM (Delrin) — low friction, rigid
  • PEEK — heat and chemical resistant
  • PA (Nylon) — strong, wear resistant
  • PC / PTFE / UHMW-PE — tough and slick

Material certificates are available on request, and we can machine from plate, bar, tubing, castings, and extrusions.

Surface Finishes

Finishes That Protect Your Part and Match Your Look

Pick the finish that fits the job. We handle most finishes in-house or with trusted partners.

As Machined

Clean cut finish around Ra 3.2 µm. Fast, lowest cost, and ready to use.

Anodizing

Type II or Type III hard coat for aluminum. Adds wear and corrosion protection, with color options.

Bead Blasting

Uniform matte texture that hides tool marks. Good for cosmetic and grip surfaces.

Black Oxide

Thin black finish for steel. Keeps dimensions and adds mild corrosion resistance.

Powder Coating

Thick, tough color finish. Great for frames, brackets, and enclosures.

Polishing & Passivation

Mirror polish for optics, or passivation to clean stainless and boost corrosion resistance.

Quality Control

How We Keep Every Part in Spec

Precision is a process, not a promise. Here is how we control it at every step.

Incoming Material Check

Material certificates are checked for every lot. The wrong grade never reaches the machine.

In-Process Inspection

First-off and in-process checks keep dimensions stable across the whole run.

CMM Measurement

Critical dimensions are measured on a CMM with recorded data, not guesses.

Optical & Gauge Checks

Optical comparators, micrometers, and pin gauges verify threads and small features.

FAI & Inspection Report

First article inspection and a full dimension report ship with your order on request.

Traceability & Hardness

Heat numbers and hardness results are recorded, so every part can be traced back.

Industries

Trusted Across Precision-Critical Industries

Our machined parts end up in products used around the world every day.

Aerospace

Structural brackets, housings, and fluid parts in aluminum and titanium to tight tolerance.

Medical & Dental

Surgical instruments, implant hardware, and device parts in stainless and titanium.

Automotive

Sensors, connectors, and jigs in steel and aluminum that hold tight tolerance.

Electronics

Heat sinks, housings, and connectors in aluminum, copper, and engineering plastics.

Semiconductor

Precise fixtures and components in aluminum, stainless, and high-performance plastics.

Robotics & Automation

Brackets, shafts, and custom fixtures for robotic arms and automated equipment.

How It Works

From CAD File to Finished Parts in 6 Steps

A clear, proven process with no surprises. You always know where your project stands.

1

Upload Your Design

Send your 3D CAD file (STEP, STP, IGES, or X_T) with your material, quantity, and finish needs.

2

Get Quote & Free DFM

Within 24 hours you get an itemized quote plus a DFM report that flags issues and suggests fixes.

3

Approve & Pay

Review the quote, ask questions, and request changes. Once approved, we start programming.

4

Machining & First-Off

We program, set up, and cut the first part. We check it against your drawing before running the rest.

5

Inspection & Finish

Every batch is inspected for dimensions and finish. We add any anodizing or coating you need.

6

Pack & Ship

Parts are packed for safe transport and shipped with your preferred carrier, tracked to your door.

Start Your Project Today

Design Tips

Simple Design Rules That Cut Cost and Defects

Good design for manufacturing (DFM) lowers cost, reduces scrap, and speeds up delivery. Here are the basics.

Keep Tolerances Realistic

Tighten only the features that matter. Extra-tight tolerance adds cost and lead time for no real gain.

Design for Rigidity

Add ribs or slightly thicker walls so the part does not flex or chatter while it is being cut.

Round Inside Corners

A cutter has a radius. Use an inside radius equal to or larger than the tool, or the corner cannot be cut.

Watch Hole Depth

Deep holes need special tooling. Keep depth under about 4 times the diameter when you can.

Specify Threads Clearly

State the thread standard and class, and add a small chamfer so threads start clean.

Plan Datums & Fixturing

Clear datums help us hold the part once and machine more faces accurately.

Not sure your design is ready? Send it to our engineers for a free review.

Why YiguProto

Six Reasons Buyers Choose Our China Precision Machining Factory

We are not a trading company. We are the manufacturer. Here is what that means for you.

Fast Quotes, Fast Turnaround

Send your 3D files and get a detailed quote with DFM feedback within 24 hours. Most parts ship in 3 to 8 business days.

Factory-Direct Pricing

No trading company and no hidden markup. You work directly with the supplier that owns the machines and the metrology lab.

Quality You Can Measure

ISO 9001:2015 certified. Every batch is inspected, and FAI and CMM reports are available on request.

Engineering Support in English

Every project gets one dedicated engineer who reviews your design and replies within hours.

Wide Material Range

From common aluminum and stainless to titanium, Inconel, and engineering plastics like PEEK and Delrin.

Your IP Is Protected

We sign an NDA before you share files. Your design stays private, and we never show customer parts without permission.

See for Yourself — Get a Quote

Trusted Worldwide

Companies Around the World Rely on Our Precision Machining Service

"We sent a complex 5-axis part with tight tolerance and YiguProto nailed it on the first run. DFM notes were helpful, the CMM report matched our own measurements, and delivery was on time."

— Design Engineer, U.S. aerospace supplier

"As a startup we needed one-off prototypes fast and in the real material. Their team turned our parts around in a week and the finish was ready to show customers."

— Founder, European robotics startup

"We have run stainless and titanium parts with them for three years. Tolerances hold, paperwork is complete, and communication is quick. A reliable machine shop partner."

— Sourcing Manager, Australian industrial equipment maker

12+
Years in Manufacturing
50,000+
Parts Machined
50+
Countries Served
ISO 9001
Certified Factory

FAQ

Precision Machining — Frequently Asked Questions

Answers to the questions buyers ask us most often.

Precision machining is a subtractive process. A computer-controlled cutting tool removes material from a metal or plastic block to make a part to exact dimensions. It covers CNC milling, CNC turning, drilling, wire EDM, and grinding, all held to tolerances that standard fabrication cannot reach.
Our standard tolerance is ±0.005 mm (±0.0002 in) on most features. On critical dimensions we can hold down to ±0.001 mm. Tell us your key dimensions and we will confirm feasibility during the free DFM review.
As-machined parts come out around Ra 3.2 µm. With fine machining, grinding, or polishing we reach Ra 0.4 µm or better. We also offer anodizing, bead blasting, black oxide, and powder coating.
Upload your 3D CAD files and tell us your material, quantity, and finish needs. Most quotes come back within a few hours on business days, and never more than 24 hours. Every quote includes free DFM feedback.
We prefer STEP (.stp, .step) or IGES (.igs, .iges) files for clean geometry. We also accept SolidWorks, Inventor, Creo/ProE, Parasolid (.x_t), DXF, and DWG files. 2D PDF drawings are welcome for tolerances and notes.
Most machined parts ship in 3 to 8 business days after you approve the quote. Simple parts and repeat orders move faster. Complex parts or special finishes may take longer, and we give you a firm date with your quote.
There is no strict MOQ. We machine one-off prototypes and small runs with the same care as large production orders, from a single part to 100,000 pieces or more.
Price depends on part size, complexity, material, tolerance, and finish. Simple parts in common aluminum cost the least. Tight tolerance, hard metals, and 5-axis work cost more. Send your CAD file for an accurate, itemized quote.
Yes. All customer files, designs, and project details are kept strictly confidential. We are happy to sign your NDA before you share sensitive information, and we never share or display customer parts without permission.
Yes. Every quote includes a free DFM review. Our engineers check tolerances, wall thickness, corner radii, hole depth, thread callouts, and fixturing, then suggest changes that cut cost or reduce risk.
Yes. We machine one-off prototypes, small bridge runs, and full production volumes on the same equipment. Tooling and fixtures built for the prototype can often carry over to production, saving setup time and cost.
We machine aluminum (6061, 7075, 2024), steel and stainless (303, 304, 316, 17-4 PH), titanium (Ti-6Al-4V), brass, copper, tool steel, Inconel, and engineering plastics such as POM, PEEK, PA, PC, PTFE, and UHMW-PE.

Ready to Get Your Precision Parts Machined?

Upload your CAD file today and get a factory-direct quote with free DFM feedback within 24 hours. No obligation. No middleman. Just tight-tolerance parts from a China manufacturer you can trust.

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