CNC machining prices: how is a quote calculated?

A machining quote is not a catalogue price: it is the sum of several cost items that depend on your drawing, the material, the quantity and the level of quality required. Knowing them lets you ask the right questions, compare quotes on an equal footing and see where to act to bring the bill down.

The eight cost items to know

• Programming and CAM: the workshop reads the drawing, prepares the 3D model, chooses the machining strategies, tools and cutting speeds, then generates the program. This is a one-off job: it is charged once, whatever the quantity.
• Setup and fixtures: setting up the tools, the part origins and the workholding, then validating the first part. Every face machined in a new position adds setup time.
• Cycle time: the machine time needed to machine one part, tool changes and handling included. This is the item that is proportional to quantity.
• Material: you pay for the raw stock (bar, plate, block), not for the finished part. Swarf and offcuts are part of the cost.
• Tooling: wear on cutting tools, special tools (form cutters, step drills) and any dedicated fixtures.
• Finishing and treatments: deburring, heat treatment, anodising, zinc plating, passivation, painting, marking. They are often handled by another workshop, which adds transport and lead time.
• Inspection: from the operator’s own checks to a measurement report from a coordinate measuring machine, with a material certificate if you ask for one.
• Transport and packaging: wedging, protection of functional surfaces, palletising, delivery.

Some items are fixed (programming, setup, first part), others are proportional to quantity (cycle time, material, routine inspection). This distinction explains most of what follows. To explore the processes available, see the page on CNC machining subcontracting.

Cycle time is multiplied by a machine hourly rate that covers depreciation, energy, maintenance, premises, the operator and the workshop’s margin. A 5-axis centre costs more to buy and maintain than a 3-axis centre: its rate is higher, but it can reduce the number of re-clamps and therefore the total time.

Indicative ranges

A higher rate does not mean a more expensive quote: a better-equipped workshop that machines the part in two setups instead of four may show a lower total price. Always ask for the price per part and a breakdown of the cost items, not just the hourly rate.

Material: you pay for the raw stock

The price depends on the grade, the form (round bar, flat, plate), the standard size available from the supplier and the volume removed. A 200 g part cut from a 2 kg block is charged on 2 kg. Material also affects cycle time: aluminium machines quickly, whereas austenitic stainless steel, titanium or nickel-based alloys require lower speeds and wear tools faster. A material certificate (for example a 3.1 certificate under EN 10204) must be requested explicitly: it may be charged for. The guide on materials for machined parts details the usual choices.

Tooling and fixtures

Standard cutting tools are included in the hourly rate. A form tool, a drill with a special profile or a dedicated fixture (jig, custom-machined jaws) are, however, priced separately, especially for a one-off part. On a production run they are spread across the parts; on three parts, they weigh heavily.

Finishing, treatments and inspection

A surface or heat treatment is almost always subcontracted: allow for the price of the operation, the round-trip transport and the lead time. A thick coating also changes dimensions, which must be shown on the drawing. As for inspection, three levels coexist: the operator’s own checks, first-part validation, then a measurement report on a coordinate measuring machine or other means, sometimes on every part. The higher the traceability requirements, the more this item weighs on the price.

Fixed costs (programming, setup, first part) are spread across all the parts in a batch. The unit price therefore boils down to: fixed costs ÷ quantity + variable cost per part. As quantity increases, the first term fades away until cycle time and material dominate.

The example below is fictitious: it illustrates the mechanism, not a market price. Assumptions: 3.5 hours of programming and setup at €60/h (i.e. €210 of fixed costs), a cycle time of 12 minutes at €65/h (€13 per part) and €6 of material per part. Margin, finishing, inspection and transport are not included.

The single part here costs more than ten times the unit price of a run of one hundred, even though the part is identical. In practice, on a run the workshop also optimises the cycle (better-suited tools, refined toolpaths, multiple fixtures), which brings the variable cost down further. Prices can also change in steps: volume of material ordered, dedicated tooling, splitting into several batches.

Most savings are made at the design stage, even before you ask for a quote. These levers apply to most machined parts; their real effect depends on your geometry.

1. Relax non-functional tolerances. Reserve tight tolerances for the surfaces that need them and apply general tolerances elsewhere. The guide on machining tolerances and ISO 2768 explains how.
2. Limit surface roughness requirements. A fine surface finish on a non-functional face requires extra finishing passes, or even grinding.
3. Design with standard internal radii. A milling cutter cannot produce a sharp internal corner. Radii compatible with common tools avoid special tools or spark erosion (EDM).
4. Avoid deep, narrow pockets and very thin walls. They require long tools and slow passes, and cause vibration and distortion.
5. Reduce the number of faces and re-clamps. A part that can be machined in one or two setups costs less than one that has to be re-clamped on five faces.
6. Choose a common material in a standard size. A grade available from stock, in a section close to the part, limits material cost and procurement lead time.
7. Group quantities. A larger batch or a framework order spreads the fixed costs, as seen above.
8. Allow a realistic lead time. An urgent request disrupts the workshop’s schedule and may cost extra; keep some margin when the part is not critical.

If the amount of material to be removed is very large or the shape is complex, ask the workshop whether a more suitable process exists: casting or forging blanks, cut and bent sheet metal, 3D printing. The guide 3D printing or CNC machining helps you decide.

Two very different quotes for the same part do not mean one is “too expensive”: they often cover different scopes. Before comparing the amounts, compare what is included.

Be wary of an offer that is clearly lower than the others with no explanation: it may rest on a misreading of the drawing, a different material or lighter inspection. Conversely, a higher quote may include full inspection and a firm lead time. If there is a big gap, ask the question: a serious workshop can break down its cost items. To go further, see how to choose an industrial subcontractor.

The best way to receive comparable prices is to give each workshop exactly the same information: dimensioned drawing, 3D file, material, quantities (several price breaks if possible), treatments, inspection level and desired lead time. The guide writing a manufacturing specification provides a ready-to-use template, and the one on file formats explains what to send.

On Meaflow, posting a request is free: several suppliers can send you their quote, which you compare and discuss through the messaging system. Your drawings are only visible to logged-in members. You can also browse the supplier directory to find machining workshops.