GreatLight CNC Machining Factory logo
CNC Machining
Rapid Prototyping
Materials
Industries
News
About GL

Get Instant Quote

Buyer guide for engineers

Fast Local CNC Processing Service

A practical guide for engineers and buyers comparing a fast local CNC processing service. You will get the checks that matter: tolerance, lead time, MOQ, certifications, and how a quote is put together. Read it before you send the next RFQ.

±0.005 mm toleranceQuote in 12 hoursNo MOQISO 9001 / IATF 16949
Fast local CNC processing service for machined metal parts
Key takeaways

What to check before you commit

Tolerance must match the feature±0.005 mm is achievable, but only on the right machines and with the right setup.
Lead time starts at the quoteA 12-hour quote and 3–5 day shipping window are the numbers that hold up in production.
No MOQ keeps prototypes honestFrom one part to 10,000+ runs, the same process controls should apply.
Certificates are not decorationISO 9001, IATF 16949, ISO 13485, and ISO 27001 map to different industries.
Price per part hides the real costSetup, material yield, and inspection time decide the final number.
Selection matrix

Which requirement drives the choice

Match the part to the process, not the other way around.

RequirementWhat to askRed flag
Tight toleranceCan you hold ±0.005 mm on this feature?Quote says 'best effort'
Fast turnWhen do chips actually fly?No production start date
Low volumeAny minimum order quantity?MOQ stated after quote
Certified workWhich certificate covers this part?Certificate named but not scoped
Complex geometryIs this a 5-axis job or 3 setups?No setup plan in the quote
Surface finishWhat Ra will the drawing get?Finish listed as 'smooth'
ConfidentialityCan you sign an NDA before files move?NDA refused or delayed

Pick the shop that answers the tolerance question first

If a supplier can name which features hold ±0.005 mm and which need a wider band, the rest of the quote is worth reading. If every answer is 'yes' with no setup plan, keep looking.

Tolerance and geometry

Tolerance is a machine and setup decision

A fast local CNC processing service is only fast if the tolerance is realistic. ±0.005 mm (±0.0002 in) is a real capability on our 16 simultaneous 5-axis machining centers and 16 mill-turn centers, but it is not automatic on every feature. A deep bore, a thin wall, or a long unsupported section will move during cutting. Ask which features the tolerance applies to. The answer separates a shop that reads drawings from one that quotes a number.

Geometry decides the number of setups. A part with features on five faces can be done on a 5-axis machine in one setup, or on a 3-axis machine in four or five. Each extra setup adds a fixture, a datam reference, and a chance for stack-up error. For parts under 500 × 500 × 450 mm, a 5-axis center is usually the cleaner route. For larger work up to 4,000 mm, the setup plan matters more than the spindle.

Material behavior is part of the tolerance conversation. Aluminum 6061 and 7075 cut differently. Titanium Ti-6Al-4V (TC4) and Inconel generate heat and tool wear, so feed rates drop and cycle time rises. Stainless 17-4PH can be machined to ±0.005 mm, but it needs sharp tooling and stable thermal conditions. If the quote ignores material, the tolerance claim is thin.

  • 1
    5-axis for one-setup accessBest when features sit on multiple faces and alignment matters.
  • 2
    Mill-turn for round partsØ400 mm rotary table covers most turned features without re-chucking.
  • 3
    3-axis for flat, simple workStill the fastest and cheapest route for one-face parts.
Speed

What fast actually means in a schedule

Speed claims are easy to make and hard to verify. The numbers that matter are the ones tied to a clock. At GreatLight, quotation and free DFM analysis go back within 12 hours. Production can start within 24 hours after the order is released. Parts ship in 3–5 days. Those three numbers are the schedule you can plan around, and they come from a shop running 127 high-precision CNC machines across three plants.

A 3–5 day window is not the same for every part. A single aluminum bracket with a bead-blasted finish is a different job than a titanium manifold with a hardcoat anodize and a CMM report. The quote should list the operations in sequence: machining, deburring, finishing, inspection, packing. If finishing is outsourced, add transit time. Ask where each step happens before you accept the date.

Local matters because the loop is shorter. A question about a drawing can be answered in the same working day, not overnight. If a feature is out of tolerance, the fix happens in hours, not weeks. That feedback loop is the real value of a local supplier, more than the shipping distance itself.

  • 1
    Quote and DFM in 12 hoursIncludes manufacturability notes, not just a price.
  • 2
    Production start in 24 hoursAfter order release and material confirmation.
  • 3
    Shipping in 3–5 daysStandard machined parts, finish included.
Cost and volume

MOQ, quote structure, and the price you compare

No minimum order quantity is a real advantage when you are iterating. We run from one prototype to 10,000+ part runs on the same process controls. That means the prototype teaches you something about the production part. If a supplier has a high MOQ, the prototype and the production part are often made on different equipment, and the lesson is lost.

Quote structure explains most price gaps. A quote that lists material, machining time, setup, finishing, and inspection is comparable to another quote built the same way. A single lump sum is not. When two shops differ by 30 percent, the difference is usually in setup amortization, material yield, or inspection scope, not in the hourly rate. Ask for the breakdown. A shop that will not show it is telling you something.

Material yield is the quiet cost driver. A part nested well on a plate wastes less stock. A part with a deep pocket or a thin rib may need a larger blank or extra support. Titanium and Inconel amplify this because the stock is expensive and the cycle time is long. For a 10,000-part run, a 5 percent yield improvement can matter more than a small rate change.

  • 1
    One part to 10,000+Same process controls at both ends of the range.
  • 2
    Line-item quotesMaterial, machining, setup, finishing, inspection.
  • 3
    Yield checkAsk how the blank nests before you compare price.
Compliance

Certifications and what they cover

Certificates are tied to a scope. ISO 9001:2015 covers quality management. IATF 16949:2016 is the automotive standard. ISO 13485:2016 is for medical devices. ISO 27001:2022 covers information security. A shop can hold all four and still not have the right scope for your part. Ask which certificate applies to the process and the plant that will run the job.

Inspection is where compliance becomes physical. We inspect 100 percent of parts before shipment, with raw material checks, in-process monitoring, and final inspection. Reports are available on request. For a tolerance-critical feature, ask for the measurement method: caliper, micrometer, bore gauge, or CMM. A number without a method is not evidence.

Confidentiality is part of the buying decision for many engineers. Uploads are secure and confidential, and an NDA is available on request. If your drawings carry export-controlled or proprietary geometry, settle the NDA before files move. It is a short step that prevents a long problem.

  • 1
    ISO 9001:2015Baseline quality management.
  • 2
    IATF 16949:2016Automotive and EV programs.
  • 3
    ISO 13485:2016Medical device components.
  • 4
    ISO 27001:2022Information security for your files.
How to run the selection

A 6-step RFQ process that finds the right shop

Use this sequence for any fast local CNC processing service you evaluate.

  • 1
    1. Write down the critical featurePick the one dimension or surface that decides whether the part works. State its tolerance and its datum. This is the first question in the RFQ.
  • 2
    2. State the real deadlineGive the date you need parts in hand, not the date you want to order. Include finishing and inspection in the window. A 3–5 day ship window needs to fit inside it.
  • 3
    3. Send a complete 2D and 3D packageSTEP or IGES for geometry, PDF for tolerances, notes, material, finish, and quantity. Missing data is the most common cause of a slow quote.
  • 4
    4. Ask for DFM notes with the priceA useful quote flags thin walls, deep pockets, and tight radii. At GreatLight this comes back within 12 hours, with the price.
  • 5
    5. Compare setup and inspection scopeLine up the quotes operation by operation. Check who does the finishing and what inspection report is included. A low price with no inspection scope is not a low price.
  • 6
    6. Confirm the certificate scope and NDAName the certificate that applies and sign the NDA before files move. Then release the order. Production can start within 24 hours.
FAQs

Questions engineers ask before ordering

Can a fast local CNC processing service hold ±0.005 mm on every feature?

No. ±0.005 mm (±0.0002 in) is achievable on the right machine, with the right fixture, on features that allow it. Deep bores, thin walls, and long unsupported sections need a wider band or extra operations.

Send the drawing with the critical features marked. We will tell you which ones hold the tight band and which ones need a different plan.

What is the real lead time from quote to parts?

Quotation and free DFM analysis come back within 12 hours. Production can start within 24 hours after order release. Parts ship in 3–5 days.

Complex finishing, unusual material, or a full CMM report can extend the window. The quote lists the operations in sequence so you can see where the time goes.

Is there a minimum order quantity?

No minimum order quantity. We run from one prototype to 10,000+ part runs.

The same process controls apply at both ends, so the prototype part and the production part come off comparable equipment.

Which materials can you machine?

Aluminum 6061, 7075, 2024, 5052, 6082; stainless 303, 304, 316L, 17-4PH, 440C; steel 1018, 1045, 4140, 4340; copper and brass C110, C36000; titanium TA2, TC4 (Ti-6Al-4V); Inconel; magnesium AZ31B; and plastics including POM, PEEK, PC, and ABS.

Material choice affects tolerance, cycle time, and tool wear. Tell us the function of the part and we will flag the trade-offs.

How do you protect our drawings?

Uploads are secure and confidential, and we hold ISO 27001:2022 for information security. An NDA is available on request and can be signed before files move.

If your program has export-control or proprietary geometry requirements, raise it in the first message.

What surface finishes are available?

Anodizing (clear, color, hardcoat, conductive), electroless nickel, zinc, silver and gold plating, powder coating, black oxide, bead blasting, tumbling, brushing, polishing, and laser marking with a minimum character height of 1.5 mm.

As-machined finish is Ra 1.6–3.2 μm. High finish is Ra 0.8–1.6 μm. Fine finish is Ra 0.2–0.8 μm. Specify the Ra the drawing needs.

Send your drawings and get a comparable quote

Quotation and free DFM analysis within 12 hours. No minimum order quantity. 100% inspection before shipment.

12-hour quoteNo MOQ100% inspectionNDA on request

Follow GreatLight

More machining notes

We publish setup notes, tooling trials and inspection data from the factory floor.

FacebookTikTokYouTubeLinkedInInstagramThreadsPinterest

Trusted by engineers and manufacturers worldwide

Tesla Ford Motor Company BYD Auto Denso Magna International Boeing Airbus Medtronic KUKA FANUC