01
The drawing is not manufacturable yet
A tight corner radius, a 0.5 mm wall, or a datum that cannot be probed. The shop quotes it anyway, then burns two weeks on fixture work. Every day spent clarifying is a day the assembly line waits.
Supply chain secrets
Supply Chain Secrets Behind Hidden Bottlenecks
Most shortages trace back to a constraint nobody mapped. We explain how hidden bottlenecks form in CNC part sourcing, and what we measure to keep machined parts moving.
±0.005 mm tolerance3–5 day shippingNo minimum order quantity100% inspectionISO 9001 / IATF 16949127 CNC machines
127High-precision CNC machines
16Simultaneous 5-axis centers
150Technicians on staff
3Wholly-owned plants
Where it breaks
Four Hidden Bottlenecks That Stall Machined Parts
None of these show up on a port dashboard. They surface during a spike.
02
Single-source on a long-lead feature
One supplier holds the only machine that can hit a deep cavity or a Ø400 mm rotary table operation. When that machine goes down, your schedule does too. Nobody mapped the second source before the order was placed.
03
Inspection data that arrives too late
Parts ship, then a CMM report shows a drift on one dimension. Rework or scrap follows, and the root cause sits three process steps upstream. Catching it at final inspection costs far more than catching it in process.
04
No buffer between prototype and volume
The prototype ran on a 3-axis mill. The production part needs mill-turn and a hardcoat finish. Process transfer eats weeks, and the first article has to be re-qualified from scratch.
How we remove it
Map the Constraint Before the Order
Three things we do before a chip is cut.
Step one
Quote the process, not just the part
A price without a route is a guess. When a drawing arrives, we review geometry, tolerances, material, and finishing as one chain. The DFM notes that come back within 12 hours name the operations, the fixture concept, and the inspection points. If a feature needs 5-axis access or a mill-turn cycle, that shows up in the quote, not after the first article fails.
This is where most lead-time damage is prevented. A 0.5 mm wall in 6061 behaves nothing like the same wall in 17-4PH. A deep pocket in PEEK wants different step-over and coolant than the same pocket in 7075. Engineers who see the route can change the design before tooling is committed, and a design change at quote stage costs a document revision instead of a scrapped batch.
- 1DFM feedback in 12 hoursFree analysis with every quotation, including fixture and inspection notes.
- 2Process route on paperMachine, workholding, and finishing sequence stated before production.
- 3Material-specific feedsAluminium, stainless, titanium, and engineering plastics each run to their own parameters.
Step two
Build capacity that does not hinge on one machine
A bottleneck is usually a single asset wearing a disguise. If only one machine can reach a feature, that machine sets your delivery date. Our floor spreads the risk across 127 high-precision CNC machines: 16 simultaneous 5-axis machining centers, 16 mill-turn centers, 12 four-axis mills, and 27 three-axis machines, plus a Ø400 mm rotary table for large round work. Maximum processing size reaches 4,000 mm.
Redundancy changes the arithmetic. A spindle down for maintenance no longer stops a family of parts, because the route was written with an alternate machine in mind. For long parts up to 4,000 × 400 × 150 mm, the same logic applies at the large-travel end. Production can start within 24 hours of an approved order, and parts ship in 3–5 days on standard work. That is the buffer most buyers cannot see on a purchase order.
- 1Alternate routing by designFeature-to-machine mapping done at planning stage, not during a breakdown.
- 2Three plants, one quality system7,600 m² across 3 wholly-owned plants under the same inspection rules.
- 3±0.005 mm held in productionNot only on the first article, and verified by 100% inspection before shipment.
Step three
Close the loop with data at every step
Inspection at the end of the line is a filter, not a control. We check raw material on receipt, monitor dimensions during machining, and run final inspection before shipment, with reports available on request. If one dimension starts drifting, the operator sees it while the part is still on the table and the offset is still adjustable.
The same data answers the harder question later: was this a one-off, or a process that is moving? A supplier who can show in-process records gives you something to act on. Qualification also transfers better. A process proven on aluminium 6061 with documented parameters is easier to move to 7075 or to a Singapore line than one that only exists in a machinist's memory. Our qualification rate on inspected work is 99.99%, and historical late-delivery probability sits below 2%.
- 1Raw material check on receiptCertificates reviewed before the first cut, not after.
- 2In-process monitoringOperators adjust offsets while the part is still in the fixture.
- 3Reports on requestDimensional records that support your own PPAP or audit file.
Choosing a route
Match the Feature to the Process
A quick guide for engineers specifying machined parts.
| Part feature | Recommended route | Why |
|---|---|---|
| Prismatic part, 3 visible faces | 3-axis milling | Fewest setups, lowest cost per part |
| Undercuts and angled holes | 4-axis or 5-axis | Reach without re-fixturing the part |
| Turned body with milled flats | Mill-turn center | One setup keeps concentricity |
| Long frame up to 4,000 mm | Large-travel 5-axis | Single setup over the full length |
| Round flange, Ø400 mm | Rotary table operation | Indexed features without repositioning |
| Prototype, one piece | 3-axis or 5-axis, no tooling | No minimum order quantity, no hard fixture |
What we run
Machining and Finishing Under One Roof
One purchase order covers cutting, finishing, and inspection.
01
5 Axis CNC Machining
Simultaneous 5-axis for contoured surfaces, undercuts, and parts that would need three setups on a 3-axis machine.
02
4 Axis CNC Machining
Rotary indexing for prismatic parts with features on multiple faces, at a lower hourly rate than full 5-axis.
03
3 Axis CNC Machining
The workhorse route for plates, housings, and brackets where all features are reachable from a few directions.
04
CNC Milling & Turning
Mill-turn centers combine a turned body with milled flats, slots, and cross-holes in a single cycle.
05
Rapid Prototyping
Machined prototypes from one piece up, so the geometry you test is the geometry you will produce.
06
Part Surface Finishing
Anodizing, plating, powder coating, black oxide, blasting, and laser marking down to 1.5 mm character height.
Scope
Specifications and Included Work
Numbers we hold on standard production orders.
| Item | Capability | Notes |
|---|---|---|
| General tolerance | ±0.005 mm (±0.0002 in) | Confirmed by inspection, not assumed |
| Surface finish | Ra 0.2–0.8 μm fine / Ra 0.8–1.6 μm high | As-machined range is Ra 1.6–3.2 μm |
| Maximum part size | 4,000 mm | Large-travel envelope 4,000 × 400 × 150 mm |
| Order quantity | 1 to 10,000+ parts | No minimum order quantity |
| Quotation | Within 12 hours | Includes free DFM analysis |
| Shipping | 3–5 days | Standard work, after production start |
| Inspection | 100% before shipment | Raw material, in-process, final |
| Certifications | ISO 9001, IATF 16949, ISO 13485, ISO 27001 | Available for supplier qualification files |
Why GreatLight
What You Can Check Before You Order
Six numbers, not six adjectives.
15Y
Machining since 2011
Fifteen years of production work in Dongguan, with a second plant in Singapore for regional delivery.
±0.005
Tolerance in millimetres
Held on production parts, verified by 100% inspection before shipment.
127
CNC machines on the floor
Sixteen of them simultaneous 5-axis, plus mill-turn and four-axis capacity.
99.99%
Qualification rate
On inspected work, measured across raw material, in-process, and final checks.
12H
Quotation turnaround
A price and DFM notes inside 12 hours, with the process route attached.
1pc
Minimum order quantity
One prototype or a 10,000+ part run, quoted on the same route.
7,600 m²Manufacturing space
3Wholly-owned plants
150Technicians
<2%Historical late-delivery probability
Industry fit
What Each Sector Requires, and What We Deliver
Aerospace brackets and housings
Lightweight pockets in 7075 and Ti-6Al-4V, with traceable material and inspection records.
- ±0.005 mm
- Ra 0.8–1.6 μm
- 100% inspection
Automotive and EV components
IATF 16949 process control for fixtures, housings, and thermal-management parts in aluminium.
- IATF 16949
- 3–5 day shipping
- 1 to 10,000+ parts
Medical device parts
ISO 13485 discipline, stainless 316L and 17-4PH, with clean finishing and dimensional reports.
- ISO 13485
- 316L / 17-4PH
- Reports on request
Robotics and automation frames
Long aluminium frames up to 4,000 mm machined in a single large-travel setup.
- 4,000 mm
- 16 five-axis centers
- <2% late risk
FAQs
Questions Buyers Ask Before Switching
What makes a bottleneck hidden rather than obvious?
An obvious bottleneck is a queue you can see: containers waiting, a machine with a backlog. A hidden one is a constraint nobody wrote down. It might be a single spindle that is the only asset able to reach a feature, a finishing line that runs one shift, or an inspection step that only happens after the parts are packed.
These constraints stay invisible while volume is steady. They surface when demand jumps or when one machine stops. The test is simple: if you removed one asset from your supplier's floor tomorrow, how many part numbers would slip? If the answer is more than a handful, you have found the hidden one.
How does DFM review shorten lead time in practice?
Most delay is created before the first cut. If a corner radius is too small for the specified end mill, or a wall is too thin for the material, the shop discovers it at setup. Then the drawing goes back to the engineer, the quote is revised, and the schedule moves by days.
We review geometry, tolerance stack, material, and finishing together and return notes within 12 hours. Fixing a radius or a datum at that stage costs a document revision. Fixing it after tooling is committed costs a scrapped batch and a new first article.
When should a part move from 3-axis to 5-axis?
Move to 4-axis or 5-axis when the number of setups, not the geometry, is driving cost. A part with features on four faces needs three or four re-fixtures on a 3-axis machine. Each re-fixture adds setup time and a new chance for datum error.
A single 5-axis cycle removes most of that. But 5-axis is not automatically better. Flat plates with features on one or two faces are cheaper and faster on a 3-axis machine, and we quote them that way. The right question is how many setups the part really needs.
How do you handle a part that needs both turning and milling?
Mill-turn centers do both in one cycle. A turned body with milled flats, cross-holes, or slots keeps its concentricity because the part is not moved between operations. That matters on shafts, fittings, and rotating assemblies where runout is specified.
On a conventional route, the turned blank goes to a mill, gets re-chucked, and picks up whatever error the second fixture introduces. Mill-turn removes that transfer. For parts that only need turning, a lathe is still the lower-cost route, and we will say so at quote stage.
What inspection data comes with the parts?
Raw material is checked on receipt, dimensions are monitored during machining, and every part is inspected before shipment. Reports are available on request, and they can be formatted to support your own quality file.
In-process monitoring is the part that prevents scrap. Operators read dimensions while the part is still in the fixture, so a drifting offset is corrected on the same piece instead of being discovered a week later on the assembly line. The qualification rate on inspected work is 99.99%.
Can you support both a prototype and a production run?
Yes, and on the same process route where possible. There is no minimum order quantity, so a single prototype and a 10,000+ part run are both quoted. Running the prototype on the route that will make the production part avoids a re-qualification later.
Some prototypes are deliberately run on a faster, simpler route to test fit and function. That is a decision to make with your engineer, and we will price both options so the trade-off is visible.
How do you protect drawings and design data?
Uploads are handled as confidential, and we hold ISO 27001:2022 for information security management. A non-disclosure agreement is available on request before any file is shared.
On the shop floor, drawings are released to the operations that need them, not circulated. If your program requires a specific data-handling clause, send it with the RFQ and it will be reviewed with the quotation.
What happens if a dimension is out of tolerance at final inspection?
The part does not ship. It is either reworked or scrapped, and the decision is documented. Because the dimension was monitored during machining, most drift is caught while the part is still on the table and can be corrected in the same setup.
If a deviation reaches final inspection, we tell you what it is, what the measured values are, and what we propose. You make the call on whether it fits the function. Shipping a part that does not meet the drawing without telling you is not an option we offer.
Put Your Next Machined Part on a Route You Can See
Send a drawing and get a quotation with DFM notes within 12 hours. No minimum order quantity, and every part inspected before it ships.
12-hour quote100% inspectionNo minimum order quantityNDA on request
