Greek CNC: How to Pick a Shop Without Getting Burned
This guide is for engineers and buyers sourcing machined parts through Greek CNC suppliers, whether the shop is local or a partner plant abroad. We cover the checks that actually change the outcome: tolerance capability, lead time, order quantity, certifications and how the quote is written. Read it before you send a drawing.
Key takeaways
What to Compare Between Two Greek CNC Quotes
Same drawing, two suppliers. Compare these fields side by side instead of comparing the bottom line.
| Check | What to ask for | Good answer looks like | Red flag |
|---|---|---|---|
| Tolerance | Per-feature tolerance on your critical dims | ±0.005 mm on bores, flatness called out separately | One blanket figure for the whole part |
| Lead time | Quote time, production start, ship days | Quote in 12 hours, start in 24 hours, ship in 3–5 days | Only a single delivery date |
| MOQ | Smallest order they will run | No minimum, one prototype up to 10,000+ parts | Setup fee that doubles at low volume |
| Certifications | Which standard, which scope | ISO 9001:2015, IATF 16949:2016, ISO 13485:2016 | Certificate with no scope statement |
| Inspection | What is measured, what is reported | 100% inspection before shipment, reports on request | Final check only, no data |
| Material trace | Mill certs for the lot used | Certs available on request | No traceability offered |
| Finishing | Done in-house or outsourced | Anodizing, plating, blasting under one roof | Finishing sent out with no owner |
| Data handling | NDA and file security | NDA on request, ISO 27001:2022 controls | Drawings sent over open chat |
The Short Version
Pick the supplier who answers the tolerance question per feature, breaks the quote into five lines, and names three lead-time numbers. Everything else is decoration.
What Tolerance a Greek CNC Shop Can Actually Hold
Tolerance is the first number buyers compare, and the easiest to misread. A shop quoting ±0.005 mm is stating its best case on a well-supported feature, not a promise that every dimension on your drawing lands there. Ask which features get that number: a bored hole held in one setup behaves differently from a 300 mm face milled across two fixtures.
The part geometry decides more than the machine does. Long thin walls deflect, deep pockets need longer tools that bend, and thin floors chatter. We see drawings where the tight tolerance sits on a feature that adds cost and inspection time without helping the part function. Move the tolerance to the mating surface and the price usually drops.
Surface finish travels with tolerance. A ±0.005 mm bore at Ra 0.2–0.8 μm needs a different tool path, a finishing pass and more gauging than the same bore at Ra 1.6–3.2 μm as-machined. Quote them together, not separately.
Inspection is the other half. A tolerance nobody measures is a guess. Ask for the inspection plan: raw material check, in-process monitoring, final inspection. For critical features, ask for the report before you approve the first article.
- 1Tight tolerance needs a datumState the datum on the drawing. Without it, the shop picks one and your stack-up shifts.
- 2Thin walls below 1 mmExpect extra passes, slower feed and higher risk. Sometimes a redesign is cheaper.
- 3Threads and reamed holesThese are usually easier to hold than a long flat surface at the same tolerance.
- 4Ask for the Cpk on a first articleIt shows whether the process is centered, not just whether one part passed.
Lead Time, Order Size and What Low MOQ Really Means
Lead time is three numbers, not one. How fast the quote comes back, how fast production starts after you approve, and how many days the parts spend in transit. A shop that answers in 12 hours and starts in 24 hours is telling you something about its scheduling. A shop that answers in a week will not start faster.
Order size works the same way. No minimum order quantity sounds generous, but read it as a statement about the floor: the same cells run a single prototype and a 10,000-part run without a separate setup charge that breaks small orders. That matters most at the prototype stage, when the design still moves.
Watch for setup buried in the unit price. On a 20-part order, a large one-time charge can look small per piece and then vanish at volume. Ask for the breakdown: material, setup, machining time, finishing, inspection. A supplier who can show it is a supplier who plans the job.
Shipping is the last variable. Parts ship in 3–5 days once they leave the floor, but customs and freight add their own time. Historical late-delivery probability below 2% sounds good until you realize it measures the shop's dispatch, not the courier's route.
- 1First article before the full runApprove one part, then release the balance. Cheaper than reworking 500.
- 2Batch sizes that match your demandOrdering 10,000 parts to save unit cost ties up cash and hides design errors.
- 3Ask when the material arrivesA quote that assumes stock on hand is not the same as one that orders it.
Certifications: Which One Your Project Actually Needs
Certificates are scoped documents. ISO 9001:2015 covers a quality management system, which is the baseline for general industrial work. IATF 16949:2016 adds automotive-specific controls like PPAP discipline and traceability. ISO 13485:2016 is the medical device standard. ISO 27001:2022 covers information security, which is about your drawings and files, not the parts.
The common mistake is treating the certificate list as a scorecard. A shop with four certificates is not automatically better for your bracket than one with two. What matters is whether the scope covers the process you are buying: machining, finishing, assembly or all three. Ask to see the scope statement, not just the logo.
For regulated industries, paperwork travels with the parts. Material certificates, dimensional reports, plating thickness records and, for medical work, process validation evidence. Decide at the quoting stage which documents you need, because generating them later is slow and sometimes impossible.
Confidentiality belongs in the same conversation. If your drawings describe an unreleased product, an NDA signed before files move is normal practice. Uploads should be treated as confidential by default, and the shop should be able to say where files live and who can open them.
- 1Match the standard to the industryAutomotive, medical and aerospace each have their own expectations.
- 2Ask for the scope, not the logoA certificate that excludes your process does not help you.
- 3Decide the document pack earlyMaterial certs and inspection reports take time to prepare.
- 4NDA before the drawingSign it first, then send the STEP file and the PDF.
7 Steps to Vet a Greek CNC Supplier
Run these in order. Each one can stop the process before you spend money on tooling.
- 1Send a real drawing, not a sketchUse the actual STEP file plus a PDF with tolerances, datums, material and finish. A vague RFQ gets a vague price, and the price will move later.
- 2Ask for the quote broken into five linesMaterial, setup, machining, finishing, inspection. If the supplier cannot split it, you cannot compare two quotes fairly.
- 3Name your critical featuresList the three or four dimensions that decide whether the part works. Ask for the tolerance and the inspection method on each, not on the whole part.
- 4Ask for a first article planWhat gets measured, on what equipment, and what report you receive. For tight features, ask how the process is centered, not just whether one part passed.
- 5Confirm lead time in three partsQuote turnaround, production start after approval, and shipping days. Write all three into the PO so nobody argues later.
- 6Check the certificate scopeOpen the certificate and read the scope. Confirm it covers machining and any finishing you are buying. Ask for material certs if your industry needs them.
- 7Agree the document pack and NDA before releaseList the reports you need at shipment, and sign the NDA before files move. Then release the run.
Frequently Asked Questions
How do I compare a Greek CNC quote with an overseas one?
Compare the same fields: per-feature tolerance, the five-line cost breakdown, the three lead-time numbers, MOQ and the document pack. A lower unit price with a vague tolerance and no inspection report is not a lower price, it is an unpriced risk.
Also compare the finishing chain. If anodizing or plating is subcontracted, add the transit time and the risk of a second supplier changing the finish spec.
Is a ±0.005 mm tolerance realistic for every part?
No. It is realistic on well-supported features in a stable setup, usually on smaller parts. Long parts, thin walls and deep pockets push the achievable number outward, and the cost rises quickly as you tighten.
Send the drawing and we will tell you which features can hold ±0.005 mm and which ones should be loosened. That conversation usually saves more money than switching suppliers.
What does no minimum order quantity actually cover?
It means the shop will run a single prototype and a 10,000+ part run without a separate small-order penalty. Setup still exists as a cost, it is just visible in the quote instead of hidden in a minimum.
For prototypes, order two or three parts. One part proves the geometry, three parts show whether the process repeats.
Which certifications should I require?
ISO 9001:2015 for general industrial work. IATF 16949:2016 if the part goes into a vehicle program. ISO 13485:2016 for medical devices. ISO 27001:2022 if you care about how your files are stored and accessed.
Read the scope on each certificate. A standard that does not cover your process does not change your risk.
How fast can parts ship?
Quotation and free DFM analysis come back within 12 hours. Production can start within 24 hours of approval, and parts ship in 3–5 days. Freight and customs time sit outside that window.
If your schedule is tight, say so in the RFQ. It changes how the job is sequenced, and sometimes it changes the process choice.
What if my parts need finishing and assembly?
Keeping machining, finishing and assembly under one roof removes the handoff where finish specs drift. Anodizing, plating, powder coating, bead blasting, polishing and laser marking are all in scope.
Laser marking has a minimum character height of 1.5 mm. Below that, the mark is unreliable, so plan the marking area on the drawing.
Send the Drawing, Get a Real Answer
Upload a STEP file and a PDF. You get a quote and a free DFM analysis within 12 hours, with the tolerance and lead-time numbers written out.
12-hour quote±0.005 mm toleranceNo minimum order quantity100% inspection
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