A CNC quote is built from a small number of ingredients. Once you know them, you can see why the same part costs more in one design than in another, and which changes bring the price down without hurting function.
A CNC quote is built from a small number of ingredients. Once you know them, you can see why the same part costs more in one design than in another, and which changes bring the price down without hurting function.
Quick answer
CNC machining cost is roughly set-up and programming + machine time + material + finishing + inspection. Machine time is usually the largest part and is driven by geometry, tolerance and material. Quantity matters because set-up is spread across the parts in a batch. At HC-Mold there is no minimum order, prototypes start at 1 piece, and quotes arrive within 24 hours of a complete RFQ. Fixed prices depend on your drawing, so we do not publish them.
Key takeaways
- Tolerance and geometry are the two levers you control most.
- Tighter tolerance costs more, so apply it only to features that need it.
- Material affects both raw cost and how fast it can be cut.
- Finishing and inspection requirements can add as much as machining itself on small parts.
The cost formula in plain terms
| Component | What it covers | What you can influence |
|---|---|---|
| Set-up and programming | CAM programming, fixtures, tool loading, first-article | Quantity per batch, design standardization |
| Machine time | Cutting time on 3-, 4- or 5-axis machines | Geometry, material, tolerance |
| Material | Stock plus scrap | Alloy choice, stock size, nesting |
| Finishing | Anodizing, plating, painting, polishing, laser marking | Number of finishes, masking needs |
| Inspection | In-process checks, CMM reports, first-article reports | Which features need documents |
| Logistics and packaging | Packing, shipping, export documents | Packaging standard, order consolidation |
The seven cost drivers
1. Material
Material affects cost twice: the price of the stock and the speed at which it can be machined. As a general rule, aluminum alloys cut quickly, stainless steel and titanium cut more slowly and wear tools faster, and engineering plastics such as PEEK need controlled cutting to avoid heat damage. HC-Mold machines more than 50 materials, including aluminum, stainless steel, brass, titanium and PEEK.
2. Geometry and number of set-ups
Every time a part must be re-fixtured to reach another face, you pay for set-up time and add a chance of datum shift. Deep, narrow pockets, thin walls and very small internal radii slow cutting. 3-axis machines suit simpler prismatic parts; 4-axis and 5-axis machines can reach more faces in one set-up and suit complex or curved parts. A 5-axis machine can carry a higher hourly rate, so it saves money when it removes set-ups, not by default. See 5-axis CNC for OEM programs.
3. Tolerance
Tolerance has a non-linear effect on price. A general-purpose tolerance such as ISO 2768 medium usually needs no special effort. As tolerances tighten, you need slower finishing passes, tighter process control, better fixturing and more inspection. HC-Mold can reach tolerances up to 0.005 mm, depending on the feature, material and part size. Reserve that capability for the features that need it.
4. Surface finish
A standard machined finish is the lowest-cost option. A finer surface, such as Ra 0.4 µm (which HC-Mold can reach), needs additional passes or polishing. Specify the finish only on functional or cosmetic surfaces.
5. Quantity
Set-up and programming are a fixed cost per batch, so unit price falls as quantity grows. A single piece carries the full set-up; ten or fifty pieces share it. Because CNC needs no tooling, there is no minimum order at HC-Mold. Look at MOQ by process if you are deciding between CNC and molding.
6. Finishing
Anodizing, plating, painting, laser marking and similar processes add cost for the process itself plus masking, racking and handling. Each additional finish adds another step. See CNC aluminum and anodizing.
7. Inspection and documents
Basic dimensional checks are part of normal machining. Full inspection reports, first-article reports and 100% checks add time. Ask for documents on critical features only. Details of HC-Mold's checks are on the inspection page.
How to reduce CNC machining cost
- Relax tolerances on non-critical features. Mark only functional features as tight.
- Use standard tool radii. Internal corners with a radius that matches common cutters avoid small-tool machining.
- Avoid deep, narrow pockets and very thin walls. If depth must be large, widen the pocket.
- Design for access. Fewer set-ups mean lower cost and better datum consistency.
- Choose the most machinable material that still meets the requirement.
- Combine finishes and avoid unnecessary ones.
- Batch revisions. Grouping revisions under one set-up window lowers unit cost, even when each revision is technically one piece.
- Order the quantity you will actually use. Unit price drops with quantity, but excess stock wastes money.
- Share a complete package. Missing information leads to assumptions in the quote and revisions later.
When CNC is not the cheapest route
CNC is excellent for prototypes, low volumes, tight tolerances and metal parts. As volume rises, a molded or cast part usually wins on unit cost, though it requires tooling. Read CNC vs injection molding for low volume to find the crossover point for your part.
What to include in a CNC RFQ
- 3D model (STEP/IGES, SolidWorks, STL) and a 2D PDF with critical dimensions and tolerances
- Material and grade
- Quantity now and expected annual volume
- Surface finish and any post-processing
- Inspection or document requirements
- Delivery date and shipping destination
Use the CNC RFQ checklist for the full list. HC-Mold accepts STEP, IGES, SolidWorks, AutoCAD, STL and PDF with dimensions, replies within 12 hours and quotes within 24 hours on a complete RFQ.
FAQ
Is there a minimum order for CNC machining at HC-Mold?
No. CNC machining has no minimum order, and prototypes start at 1 piece.
How fast can CNC parts be delivered?
CNC lead time is 5 to 10 days and CNC prototypes 3 to 5 days, depending on the part.
How tight can you hold tolerances?
Up to 0.005 mm, depending on the feature, material and part size.
Why does anodizing add cost?
It is a separate process with masking, racking and handling, and each extra finish adds a step.
Does ordering more parts lower the price per piece?
Yes, because set-up and programming are shared across the batch.
Get a CNC quote within 24 hours
Upload your drawing with material, tolerance and quantity. We reply within 12 hours and quote within 24 hours of a complete RFQ.
Written by HC-Mold Engineering Team · Reviewed by HC MOLD · Last updated: 2026-10-06
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