CNC Machined Service Price
This guide is for engineers and buyers who need to compare quotes without getting lost in line items. You will get the levers that actually move CNC machined service price, the questions to ask before you commit, and the warning signs that a low number is hiding a process problem.
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What drives CNC machined service price
CNC machined service price: what each factor does to your quote
Use this to see which line item a supplier is responding to when the number changes.
| Factor | Low-cost typical | Higher-cost typical | Why it moves |
|---|---|---|---|
| Tolerance | ±0.05 mm general | ±0.005 mm ground features | Tighter tolerance needs slower passes, more checks |
| Geometry | Open pockets, flat faces | Deep cavities, thin walls | Long reach tools and reduced speed raise cycle time |
| Material | 6061 aluminium, ABS | Inconel, TC4 titanium, PEEK | Tool wear and cutting speed change the feed rate |
| Quantity | 1 to 10 prototypes | 10,000+ parts | Setup spread per part falls at volume |
| Finish | As machined Ra 1.6–3.2 μm | Hardcoat anodize, electroless nickel | Secondary operations and handling add steps |
| Documentation | Basic inspection | Full traceability, FAI report | Measurement time and paperwork are billable |
| Lead time | Standard 3–5 days | Expedited scheduling | Machine time is reserved ahead of other jobs |
The cheapest CNC machined service price is rarely the lowest total cost
Compare on scope, process plan and lead time before you compare on the number. A quote that includes DFM review, 100 % inspection and a 3–5 day shipping window is usually cheaper in the end than a low bid that stalls at first article.
How a CNC machined service price is actually built
A CNC machined service price is not a single rate. It is a stack: setup, programming, cycle time, material, tooling, finish and inspection. On a one-off part, setup and programming can be half the total. On a 5,000-part run, cycle time dominates and everything else spreads thin.
This is why two shops can give you numbers that differ by 40 % on the same drawing. One may be quoting a 3-axis process with two setups. The other may be quoting a 5-axis cell that machines five faces in one setup. The second looks expensive on paper but often wins after you add fixture cost and rework risk.
Material is the most visible cost and the least controllable. Aluminium 6061-T6 and brass C36000 cut quickly. Stainless 316L and 17-4PH cut at roughly half the speed. Titanium TC4 and Inconel cut at a third or less, and they eat inserts. If your part is Inconel, expect the machining line to outweigh the metal price.
- 1Setup and programmingFixed cost per part number. Amortized across quantity.
- 2Cycle timeThe only line you can shrink with a better process plan.
- 3Inspection100 % inspection before shipment, with reports on request.
Which tolerances are routine and which ones change the price
General tolerances of ±0.1 mm are standard on most milled parts. They need no special handling and no extra inspection time. A CNC machined service price at this level is driven mainly by geometry.
At ±0.005 mm, the process changes. You need temperature-stable cutting, sharp tooling and a CMM check. That is normal work on a 5-axis machining center, so the price step is modest, not dramatic. The mistake is applying that tolerance across every dimension on the drawing. Call out only the features that matter. If a bore is a bearing seat, tolerance it. If a clearance hole is not, leave it general.
Thin walls are the quiet cost driver. A 0.5 mm wall on aluminium will deflect under normal clamping. The shop has to reduce depth of cut, add support, or machine it in two passes. That adds time and does not show up on the drawing as a tolerance callout.
- 1General ±0.1 mmStandard milling and turning. No premium.
- 2±0.005 mmRoutine on 5-axis. Adds in-process checks.
- 3Thin walls under 1 mmClamping and deflection control add cycle time.
Why quantity changes the quote model
A supplier with no minimum order quantity will quote a single prototype. That price includes setup, programming and fixture time that would otherwise be spread across hundreds of parts. It is not a markup. It is the true cost of a one-off.
At 100 to 500 parts, the shop can justify a soft jaw or a custom fixture. Cycle time drops because the operator is not re-indicating the part every cycle. At 10,000 parts, tool paths get optimized, tool changes get minimized, and the part may move to a dedicated cell. Unit price falls again.
Ask for two quotes at different quantities. If the price per part does not drop between 50 and 500, the supplier is not planning a fixture. That is a warning sign for volume work.
- 1No MOQFrom one prototype to 10,000+ part runs.
- 2Fixture thresholdAround 50 to 100 parts, dedicated workholding pays back.
- 3Volume cellAbove 5,000 parts, plan for dedicated machine time.
Post-processing lines in a CNC machined service price
Finishing is where quotes get hard to compare. Anodizing has three common types at GreatLight: clear, colour and hardcoat. Each has a different bath time and masking requirement. Hardcoat builds a thicker oxide layer and can add 5 to 10 μm per surface, which matters on close-tolerance holes.
Plating follows the same logic. Electroless nickel gives a uniform coating on complex geometry. Zinc plating is cheaper but offers less corrosion resistance. Silver and gold plating are used for conductivity, not appearance, and the price reflects the metal.
Mechanical finishes are the most variable. Bead blasting is fast and hides tool marks. Polishing to a mirror finish is hand work and is priced by area. Laser marking is priced per character and needs a minimum character height of 1.5 mm to stay legible.
- 1AnodizingClear, colour, hardcoat and conductive. Masking affects price.
- 2PlatingElectroless nickel, zinc, silver and gold.
- 3MechanicalBead blasting, tumbling, brushing and polishing.
Lead time is part of the price, not separate from it
A quote that promises 3 days and delivers in 3 weeks costs more than the invoice shows. Late parts stall assembly lines and force expedited shipping. The historical late-delivery probability at GreatLight is below 2 %, and that number is worth more than a small unit-price discount.
Normal flow is: quotation and free DFM analysis within 12 hours, production starting within 24 hours, and parts shipping in 3 to 5 days. Expedited scheduling exists but it consumes machine time that would otherwise go to another job, so it carries a cost.
When you compare lead times, ask what happens after the quote. Does the shop flag a DFM issue before cutting metal, or after the first part fails inspection? The earlier that conversation happens, the less it costs you.
- 1Quote turnaround12 hours, including free DFM analysis.
- 2Production startWithin 24 hours of approval.
- 3Shipping window3 to 5 days for standard work.
A 7-step checklist before you accept a CNC machined service price
Run these in order. Each step removes a category of hidden cost.
- 11. Send a complete drawing packageInclude 3D STEP, 2D PDF with GD&T, material spec and finish callout. Missing data forces the shop to assume, and assumptions get priced conservatively.
- 22. State the real tolerance on critical features onlyMark bearing seats, sealing faces and mating bores at ±0.005 mm. Leave clearance holes at general tolerance. If you tolerance everything tight, you pay for everything tight.
- 33. Ask for the process plan in one sentenceA 3-axis plan with three setups and a 5-axis plan with one setup can differ by 30 to 50 % in cycle time. The sentence tells you which one you are buying.
- 44. Request two quantity breaksAsk for 1, 50 and 500 pieces. If the unit price is flat, the shop has not planned a fixture and volume work will not get cheaper.
- 55. Confirm the inspection level100 % inspection before shipment is the baseline. Ask whether reports come with the parts or on request. For medical and automotive work, plan for traceability from raw material.
- 66. Check certifications against your industryISO 9001:2015 covers general quality. IATF 16949:2016 is for automotive. ISO 13485:2016 is for medical devices. ISO 27001:2022 covers data security. Match the certificate to the audit you will face.
- 77. Agree on the finish and marking before cuttingHardcoat anodize changes hole size. Laser marking needs 1.5 mm character height. Resolve both before the first chip is cut, not after.
Questions buyers ask about CNC machined service price
Why is a one-off prototype so much more expensive per part?
Setup and programming are fixed costs. On a single part, they are not spread across anything. You are paying for machine preparation, CAM time and a first-article check that a 500-part run absorbs across every unit.
Ask for a DFM review before the quote is finalized. Catching a deep cavity or an unreachable feature at that stage often removes a setup entirely.
Does a tighter tolerance always mean a higher price?
No. ±0.005 mm is routine on a 5-axis machining center and adds inspection time, not a new process. The bigger cost jump comes from geometry: thin walls, deep pockets and features that need long-reach tooling.
If a quote doubles because of tolerance alone, ask which features are driving it. Often the answer is that tolerance was applied across the whole drawing instead of the critical few.
How do I compare quotes from shops in different countries?
Normalize the scope first. Confirm that every quote includes the same material grade, the same finish, the same inspection level and the same quantity. Then compare lead time and documentation.
A lower unit price with no inspection report and a two-week lead time is not the same product. Put both numbers side by side on scope, not just on cost.
What does no MOQ actually mean for pricing?
It means the shop will quote from one piece, so you can validate a design before committing to tooling. The unit price at quantity one reflects the fixed costs. It is not a discount structure.
Expect the unit price to fall at 50 pieces when a fixture is justified, and again at 5,000 pieces when a dedicated process is set up.
Which certifications should I look for?
ISO 9001:2015 is the baseline for general manufacturing quality. Add IATF 16949:2016 for automotive parts, ISO 13485:2016 for medical devices, and ISO 27001:2022 if your drawings and data need protection.
Certifications affect price through documentation and traceability, not through marketing. A shop that cannot show traceability from raw material will struggle in an audit.
Can I get a quote without sharing my full design?
You can usually get a budgetary number from a 2D outline and material, but a firm quote needs the full geometry. Uploads are handled as secure and confidential, and an NDA is available on request.
The DFM analysis that comes with the quote is where most of the cost savings are found, and it works best with the complete model.
Get a CNC machined service price you can compare line by line
Send your drawings and we will return a quotation with free DFM analysis within 12 hours, plus a process plan you can check against any other bid.
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