Shifting Supply Chain Strategy for CNC Machined Parts

3Wholly-owned plants

127High-precision CNC machines

±0.005 mmAchievable tolerance

< 2%Historical late-delivery rate

Where it breaks

Does any of this sound like your current plan?

Most disruptions are not dramatic. They are small single points of failure that were never qualified anywhere else.

01

One set of tools, one location

Every part you buy depends on one mold, one fixture or one machine. When that tool is damaged or that plant stops, you have no drawing-compliant source and no schedule you can hold.

02

You find out after the line stops

Nobody flags the problem until the assembly line is short of parts. By then the only options left are expedited freight at premium rates, a partial build, or a line-down notice to your own customers.

03

Tolerance drifts when a source changes

A replacement supplier quotes the drawing but cannot hold the same datum scheme, surface finish or edge condition. Parts arrive, they measure close, and they still will not seat in the fixture.

04

Cash tied up in safety stock

You hedge against uncertainty by carrying three months of inventory. That is working capital sitting on a shelf, plus shelf-life risk on plastics and plating, and it hides the real capacity problem.

The approach

Build the second path before you need it

Two capabilities carry most of the load: qualified redundancy, and engineering that reacts to a stopped tool rather than a stopped purchase order.

Redundancy

Two qualified sources, one drawing

The useful version of a shifting supply chain is not a longer supplier list. It is two sources that have both run your part, both hold the same tolerance band, and both have inspection data on file. When the first one stumbles, the second one is already warm.

We run this across 3 wholly-owned plants and 127 high-precision CNC machines, including 16 simultaneous 5-axis machining centers, 12 four-axis mills, 27 three-axis machines and 16 mill-turn centers. A part can be moved between machine groups without requalifying the process from zero.

1
Same fixture logicDatum scheme and workholding are documented so a second machine reproduces the same result.
2
Inspection data on bothRaw material check, in-process monitoring and final inspection, with reports on request.
3
Size range coveredFrom 500 × 310 × 200 mm compact work up to 4,000 × 400 × 150 mm.

CNC Lathe Technical Specifications Terminology

Reaction

Fast wins and slow wins, ranked in hours

When a tool breaks or a shipment is held, we do not start by asking for a new purchase order. We list every route to a conforming part, then split that list into what can ship in days and what needs a longer build. Short lead first, permanent fix second.

That habit comes from the shop floor, not from a slide deck. Quotation and free DFM analysis come back within 12 hours, and production can start within 24 hours of a released drawing. For a stopped line, that gap is the whole difference.

1
Temporary routeMachined from billet or plate on 3-axis and 4-axis mills while tooling is rebuilt.
2
Bridge quantityNo minimum order quantity, so a short run can cover the gap without a 10,000-part commitment.
3
Permanent route5-axis, mill-turn or die casting restored once the original path is stable.

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Choosing a route

Which recovery route fits your part

Pick by geometry, quantity and how fast the line needs parts.

Situation	Route	Typical window
Tool damaged, line still running	Machine from billet on 3-axis or 4-axis	Parts ship in 3–5 days
Line stops this week	Short run, no MOQ, expedited inspection	Production starts within 24 hours
Geometry needs one setup	Simultaneous 5-axis, Ø400 mm rotary table	Quoted within 12 hours
High volume, tooling rebuilt	Mill-turn or die casting, dual plants	Longer build, lower unit cost
Tight cosmetic requirement	Anodizing, bead blasting, laser marking	Added to the same shipment

What we run

Machining and finishing under one roof

One supplier for the recovery part and the volume part keeps the inspection record in one place.

01

5 Axis CNC Machining

16 simultaneous 5-axis centers for contoured parts that would otherwise need three or four fixtures and three or four chances to lose a datum.

02

4 Axis and 3 Axis CNC Machining

12 four-axis mills and 27 three-axis machines handle prismatic parts, plates and brackets where a simple, repeatable setup beats a complex one.

03

CNC Milling & Turning

16 mill-turn centers cut shafts, housings and fittings in one cycle, which removes a second op and the stack-up that comes with it.

04

Rapid Prototyping

For fit checks and design reviews before tooling is cut, so a wrong revision is caught on a prototype and not on a production tool.

05

Sheet Metal, Die Casting, Vacuum Casting

Enclosures, frames and housings for programs that mix machined and formed parts in the same build.

06

Part Surface Finishing

Anodizing, plating, powder coating, bead blasting and laser marking with a minimum character height of 1.5 mm.

Scope

Capacity and quality at a glance

Numbers you can put in a sourcing review.

Item	Range	Note
Tolerance	±0.005 mm (±0.0002 in)	Measured on final inspection
Surface finish	Ra 0.2–0.8 μm fine, Ra 0.8–1.6 μm high	Ra 1.6–3.2 μm as machined
Maximum size	4,000 × 400 × 150 mm	Ø400 mm rotary table available
Materials	Aluminium, stainless, steel, copper, titanium	6061-T6, 304, 17-4PH, TC4, PEEK and more
Order size	One prototype to 10,000+ parts	No minimum order quantity
Inspection	100% before shipment	Reports on request

Why GreatLight

The numbers behind the plan

Founded in 2011, 15 years in precision machining, 150 technicians.

3

Wholly-owned plants

Dongguan plus a Singapore factory at No.3 Joo Koon Circle, so a regional disruption does not take out every machine you depend on.

127

CNC machines

Enough separate machine groups that one down spindle is a scheduling change, not a stopped program.

±0.005

Millimeter tolerance

Held across a production run and confirmed by 100% inspection before shipment.

12 h

Quote and DFM

Drawing in, quotation and free DFM analysis back within 12 hours, including manufacturability notes.

24 h

To production start

Once the drawing is released, production can begin within 24 hours rather than waiting in a queue.

99.99%

Qualification rate

Parts that pass final inspection on the first submission, backed by ISO 9001:2015 and IATF 16949:2016.

7,600 m²Manufacturing space

150Technicians

15 yearsPrecision machining

ISO 27001Secure file handling

Fit by industry

What these sectors require, and what we deliver

CNC Machining Services Online — Automotive & EV
Housings, brackets and busbar parts where a line-down event costs far more than the part. IATF 16949:2016 process control and PPAP-style documentation on request.
IATF 16949:2016
±0.005 mm
3–5 day shipping

6011 — Medical Devices
Small stainless and titanium components that need a clean edge, a repeatable finish and a traceable inspection record rather than a fast guess.
ISO 13485:2016
100% inspection
316L, TC4

oplus_262178 — Industrial Machinery & Robotics
Plates, frames and shaft assemblies where one datum error shows up as vibration at speed. Mill-turn keeps the critical features in one setup.
4,000 mm envelope
16 mill-turn centers
< 2% late risk

cnc machining — Aerospace & New Energy
Low-volume, high-mix structural parts in aluminium and titanium, quoted fast and re-runnable across more than one plant when schedules move.
5-axis simultaneous
7075, TC4
No MOQ

FAQs

Questions buyers ask before they switch

How do you qualify a second source without paying for it twice?

You do not need a duplicate tool for every part. We keep the fixture logic, datum scheme and inspection method documented, so a second machine group in another plant can run the same drawing and be checked against the same measurements.

For critical features we run a first-article comparison and send the report. If the geometry will not reproduce on a second machine, we say so at the quote stage instead of after the first shipment.

What if my existing supplier's tool is damaged and I need parts this month?

Send the 3D model and drawing. We quote and return a free DFM analysis within 12 hours, and production can start within 24 hours of release. Parts typically ship in 3–5 days.

Where machining from billet is cheaper and faster than rebuilding tooling, that route usually gets your line running first, with the original process restored afterwards.

Which parts should not be moved to a second source?

Very large single castings and parts with a finish that depends on one specific plating line are the hardest to duplicate quickly. Deep-cavity molds with long polishing cycles fall in the same group.

For those, plan a buffer or accept a longer recovery window. Machined and mill-turn parts are the easier candidates for dual sourcing.

Do you require a minimum order quantity?

No. We run from one prototype to 10,000+ part runs. A short bridge run during a disruption does not commit you to volume pricing you cannot use.

How do you keep tolerances consistent between two plants?

The same drawing, the same datum callouts and the same inspection criteria travel with the job. We work to ±0.005 mm and inspect 100% of parts before shipment, with raw material checks and in-process monitoring upstream.

If a feature needs a specific surface finish, we state the band: Ra 0.2–0.8 μm fine, Ra 0.8–1.6 μm high, Ra 1.6–3.2 μm as machined.

Is my design file safe if I send it to a new supplier?

Uploads are secure and confidential. We hold ISO 27001:2022 for information security, and an NDA is available on request before you send anything.

What materials can you run for a recovery order?

Aluminium 6061, 6061-T6, 2024, 5052, 5083, 6063, 6082, 7075 and ADC12; stainless 303, 304, 316, 316L, 17-4PH and 440C; steels including 1018, 1045, 4140 and 4340; copper and brass grades; titanium TA1, TA2, TC4 and Inconel; plastics such as POM, PEEK, PC and ABS.

Material choice often decides the route. 7075 and TC4 machine well on 5-axis but are poor candidates for a quick casting swap.

How do I start a dual-source review?

Send the drawing, the annual volume and the tolerance callouts that matter. You get a quotation and a DFM analysis within 12 hours, and we flag which features can be duplicated quickly and which cannot.