CNC Service Machining Pricelist: What Actually Drives Your Quote

• 1
  Key takeaways
• 2
  Comparing CNC quotes: what to check line by line
• 3
  Post-processing: what it adds to the part and the quote
• 4
  Material: the line item that moves the most
• 5
  Tolerance and geometry: where machine time hides
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  Volume, setup and the shape of the price curve
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  Lead time, certification and the hidden parts of a quote
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  Capacity signals worth verifying before you send a PO
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  How to get a comparable CNC quote in five steps

Material is usually the first thing a shop prices and the last thing a buyer questions. It should be the other way around. Aluminium 6061-T6 machines fast, cuts clean and costs little per kilogram. Titanium TC4 (Ti-6Al-4V) and Inconel cut slowly, wear tooling quickly and need lower feeds and depths of cut, so the same geometry can take three to five times the machine time.

Ask whether the alloy you specified is doing real work. If a bracket sees no elevated temperature, 17-4PH stainless will often do what Inconel was written in for, at a fraction of the machining cost. If a part is not structural, 6061 or 6082 may replace 7075 without any functional loss.

Material also sets your finishing options. Hardcoat anodizing behaves differently on 2024 than on 6061. Beryllium copper needs handling controls. PEEK machines cleanly but is expensive per kilogram, so near-net stock sizes matter.

One practical check: ask the shop to price your part in two alloys before you commit. A cnc service machining pricelist quoted against a single material hides the easiest saving on the project.

Tolerance is not one number for a whole part. It is a set of decisions per feature, and each one costs differently. General dimensions at ±0.1 mm run on a 3-axis mill with standard workholding. A bore at ±0.005 mm may need a separate finishing pass, a temperature-stable setup and a CMM check before shipment.

Geometry adds its own cost. Undercuts, deep cavities, free-form surfaces and features on five faces push the job to 4-axis or 5-axis work. Five-axis machining removes multiple setups, which often lowers total cost on complex parts even though the hourly rate is higher. On simple prismatic parts, 3-axis is still cheaper.

Wall thickness matters more than people expect. Thin ribs deflect under cutting force, so the shop slows down and takes lighter passes. Deep holes need peck drilling or gun drilling. Both show up as time, not as a line on the pricelist.

Ask which features drive the price. Engineers who know that one tight bore is responsible for 40% of the cycle can often loosen it and keep the function.

Every job carries a fixed cost: programming, fixtures, first-article inspection, material order. That cost is spread across the run. At one piece it dominates the unit price. At 500 pieces it is nearly invisible.

The curve is not linear. Unit price falls sharply from 1 to 50 pieces, then flattens as cycle time and material become the floor. Two quotes that look far apart at quantity 1 can be nearly identical at quantity 200. That is why comparing quotes at the wrong volume is a common mistake.

Prototype quantities should be quoted as prototypes. If your design is not frozen, paying for hard fixturing at quantity 5 is wasted money. Conversely, if you know the part will run at 10,000 pieces, say so early. The shop can then choose tooling and stock sizes that pay off across the run.

A supplier with no minimum order quantity lets you buy the quantity the project actually needs. That flexibility is worth more than a few cents of unit price.

A 3–5 day ship date is a scheduling commitment, not a discount. To hit it, a shop either holds capacity or moves your job ahead of another. Both cost money, so rush work is normally priced above standard work. Ask what the standard and expedited windows actually are before you assume the faster one is free.

Certifications change who can bid, not just who can be trusted. ISO 9001:2015 covers general quality systems. IATF 16949:2016 is required for automotive production parts. ISO 13485:2016 applies to medical devices. ISO 27001:2022 covers information security, which matters when your drawings and CAD files leave your network.

The quiet costs sit outside the unit price: material certificates, first-article reports, CMM data, custom packing, freight, and document handling under NDA. Any of these can be included or excluded. Comparing two quotes without knowing which side of the line they fall on is guesswork.

Also check who owns the risk on a rejected lot. A shop with 100% inspection before shipment and a 99.99% qualification rate is pricing that inspection into the quote. That is not padding. It is the difference between a cheap part and a part you can assemble.

Machine list is the cheapest thing to publish and the easiest thing to inflate. Ask instead about the specific machines that would run your part. A shop with 16 simultaneous 5-axis machining centers, 16 mill-turn centers and a 4,000 mm maximum processing size can take on large, complex work in one setup. That directly affects your price and your lead time.

Size limits determine feasibility. A part that fits inside a 750 × 1,150 × 550 mm envelope and one that needs 4,000 × 400 × 150 mm are different jobs at different shops. Send the envelope with the RFQ so the quote is real.

Where the work happens matters too. GreatLight runs 3 wholly-owned plants covering 7,600 m² with 150 technicians, plus a Singapore facility at No.3 Joo Koon Circle, Singapore 629032. A single supply chain means one quality system and one point of contact.

Finally, ask what happens when a dimension is out. A shop that catches it in-process will rework or remake. A shop that catches it at final inspection ships late. Both outcomes are cheaper than a rejected assembly at your dock.