Buyer guide

CNC lathe processing cost per hour: 7 checks before you approve a quote

This guide is for engineers and sourcing staff who compare turning quotes line by line. It breaks the hourly rate into its parts, shows which shop-floor facts move it, and gives you seven checks that tell a fair rate from a cheap one.

Get Instant Quote Talk to an Engineer

±0.005 mm toleranceNo MOQ12-hour quote + DFM

CNC lathe processing cost per hour guide

On this page

Key takeaways

The rate is a bundleMachine time, setup, tooling, inspection and overhead are folded into one hourly figure.

Cycle time beats the rateA shop at $60/hour with a 4-minute cycle usually costs less than $40/hour at 7 minutes.

Setup spread decides small lotsOn 10 parts, setup can be 40% of the invoice; on 1,000 parts it nearly disappears.

Hardness and finish drive tool cost17-4PH or 316L with a fine finish can triple insert spend against free-cutting 303.

Ask for the assumptionsBar size, lot size, tolerance and finish should be listed, not implied.

Comparison

Turned-part types and what they cost you

Read down the left column, then check the row that matches your part.

Part type	Typical hourly band	What drives it up	When it is not worth it
Simple shaft, Ø10–40 mm	Lowest band	Long cycle, bar feeder work	Tight runout on long overhangs
Threaded fitting, small lot	Mid band	Setup hours spread over few parts	Thousands of parts, then form tool wins
Bushing with fine bore	Mid to high	Boring passes, gauging time	Loose bore tolerance is acceptable
Housing, mill-turn	High	Live tooling, second setup removed	Simple round part with no cross holes
Hardened 17-4PH part	High	Insert wear, slower speeds	Soft 303 or 6061 will do the job
Prototype, one piece	Highest per piece	Programming and fixturing on one part	Design still changes weekly

Pick the rate you can hold, not the one that looks lowest

Compare turning quotes at your real lot size, material and finish, and insist on the assumptions in writing. A rate that includes setup planning, tooling and 100 percent inspection is usually the cheaper one by the time parts reach your line.

Get Instant Quote Talk to an Engineer

What the rate covers

What sits inside the hourly number

A quoted hourly figure is not machine rent. It bundles spindle time, the operator standing at the panel, insert and holder consumption, the inspection that follows the cut, and the floor space, power and coolant behind all of it. When a shop says $55 per hour, that number already assumes a certain bar size, a certain lot size and a certain finish. Change any of those and the number should move.

The machine class matters more than most buyers expect. A three-axis lathe with a bar feeder runs simple diameters cheaply because the operator can load a bar and walk away. A mill-turn center with live tooling costs more per hour, yet it can drill a cross hole and face a flange in the same chucking. That single setup often removes a second operation, a second fixture and a second inspection. The higher rate can produce the lower invoice.

Setup is the part buyers underestimate. On a ten-piece run, an hour of programming, chuck jaw boring and first-article checks is spread across ten parts. On a thousand-piece run, the same hour is spread across a thousand. This is why the per-piece price on a prototype and a production run rarely come from the same hourly logic.

Tooling follows the material, not the machine. Free-cutting 303 stainless turns with light insert wear. A 17-4PH or Inconel part at the same diameter will wear inserts faster, force lower surface speeds and need more frequent offsets. Expect the hourly band to rise before any feature gets complicated.

1
Machine classThree-axis bar work sits at the bottom; mill-turn and 5-axis sit higher.
2
Setup spreadDivide setup hours by lot size before you judge the rate.
3
ToolingInsert life depends on hardness and finish target, not on the spindle.
4
InspectionA CMM report on every part is a different service than a caliper check.

Judging criteria

How to compare two turning quotes fairly

Put both quotes on one page and normalize them. Convert each to per-piece price at the same lot size, the same material condition and the same finish callout. A quote built on cold-drawn bar and a quote built on hot-rolled bar are not the same offer. Neither is a quote that machines the bore to ±0.05 mm against one that holds ±0.005 mm.

Then look at what each shop assumes it will not do. A low rate with 'deburr by customer' or 'inspection not included' is not low. Ask directly which operations are outside the price: anodizing, heat treat, plating, laser marking, first-article report, and shipping. Those line items can add 20 to 40 percent once they surface.

Check the tolerance claim against the drawing, not against the marketing. If your bore is ±0.01 mm and the shop's stated capability is ±0.005 mm, the margin is real. If the shop quotes ±0.005 mm on a 300 mm long shaft without steady-rest discussion, ask how the deflection is handled. A capability figure without a part geometry attached means nothing.

Finally, weigh lead time as a cost. Parts that sit in transit for two extra weeks tie up your assembly line and your cash. A slightly higher hourly rate that ships in 3–5 days is often cheaper than a low rate with an open delivery date.

1
Normalize firstSame lot size, material condition and finish before comparing.
2
List exclusionsFinishing, inspection and reports are the usual hidden add-ons.
3
Test the tolerance claimAsk how the geometry and fixturing support that number.
4
Price the delayA late shipment has a cost even when the invoice looks small.

Materials and geometry

Where the rate climbs and where it does not

Diameter and length-to-diameter ratio decide how much of the rate you actually need. A short Ø30 mm aluminum spacer turns fast on any machine. A Ø12 mm shaft at 250 mm long needs a steady rest, light depths of cut and several passes to hold straightness. The hourly rate may stay flat while the cycle time doubles.

Material hardness pushes the rate through tooling and speed. Aluminum 6061 and 7075 cut quickly and hold a good finish. Brass C36000 is even friendlier. Move to 316L, 17-4PH or titanium TC4 and surface speeds drop, insert changes rise and the operator checks more often. Inconel sits at the far end: it can be turned, but the same feature costs several times the aluminum version.

Feature count is the quieter driver. Every cross hole, slot or flat on a turned part pulls the job toward live tooling or a second milling operation. If the drawing has one flat on a flange, a mill-turn center handles it in the same chucking. If the drawing has eight holes on a bolt circle, that is a milling job and should be quoted as one.

Finish callouts do the same thing. As-machined at Ra 1.6–3.2 μm needs nothing extra. A seal face at Ra 0.2–0.8 μm needs a finer insert, a slower pass and more frequent measurement. The part does not get harder; the process gets longer.

1
Slender partsAdd a steady rest and light passes; cycle time climbs.
2
Hard alloysLower surface speed, shorter insert life, more offsets.
3
Cross featuresLive tooling or a second setup; quote it as a milling op.
4
Fine finishRa 0.2–0.8 μm costs time, not a different machine.

Shop signals

Signals that the quoted rate is real

A shop that can explain its own number is usually a shop that can hold it. Ask what bar stock size the quote assumes, how many setups are included, and whether the first article is inspected on a CMM. Clear answers mean the estimator actually planned the job rather than applying a flat rate to every part on the desk.

Certifications tell you which markets the shop is set up to serve. ISO 9001:2015 covers general quality management. IATF 16949:2016 is what automotive and EV programs expect. ISO 13485:2016 applies to medical work. ISO 27001:2022 covers information security, which matters if your drawings are sensitive. A shop holding these has already paid for the process discipline behind them.

Capacity shape matters too. GreatLight runs 127 high-precision CNC machines across three wholly-owned plants covering 7,600 m², with 16 simultaneous 5-axis centers, 16 mill-turn centers, 12 four-axis mills and 27 three-axis machines. That mix lets the estimator route a simple shaft to the cheapest capable machine instead of forcing every job onto the newest one. Processing size reaches 4,000 mm, with a Ø400 mm rotary table for larger turned work.

Inspection practice is the last signal. A shop that checks 100 percent before shipment, with raw material check, in-process monitoring and final inspection, will catch a drifting bore before it becomes a rejected lot. Reports are available on request. That step is part of why a rate holds up over a run.

1
Clear assumptionsBar size, setup count and inspection method stated up front.
2
Right certificationsMatch the certificate to your industry, not to the brochure.
3
Machine mixRoute simple parts to simple machines, not to the flagship.
4
Inspection in the price100% before shipment beats a cheaper rate and a rework loop.

Step by step

Seven checks before you approve a turning quote

1
Normalize the lot sizeRe-quote both suppliers at the same quantity, for example 50 and 500 pieces. A rate compared across different lot sizes is not a comparison.
2
Confirm material conditionState whether bar is cold-drawn, hot-rolled or pre-hardened. Hardness above 30 HRC changes speeds and insert life, so it must appear in the quote basis.
3
Match tolerance to the drawingList only the dimensions that carry a tight callout. Turning a bore to ±0.005 mm when the function needs ±0.05 mm buys accuracy you will not use.
4
Separate turning from millingCount cross holes, slots and flats. If there are several, ask whether the part runs on a mill-turn center or needs a second operation.
5
Spell out the finishGive a Ra value per surface. Ra 1.6–3.2 μm as-machined, Ra 0.8–1.6 μm for sealing faces, Ra 0.2–0.8 μm only where the function demands it.
6
List every outside operationAnodizing, plating, heat treat, laser marking and first-article reports should each appear as a line. Marking has a minimum character height of 1.5 mm.
7
Ask for the delivery basisGet the ship window in writing with the rate. A quote with no delivery basis hides the most expensive variable.

FAQs

Questions buyers ask about turning rates

Is a lower hourly rate always cheaper?

No. The invoice follows cycle time plus setup divided by lot size plus tooling plus inspection. A shop at a lower rate with a longer cycle and more setups can cost more per piece than a higher-rate shop that machines the part in one chucking.

Run the arithmetic at your actual quantity before you choose. The rate is one input, not the answer.

Why does the same part cost more in 316L than in 303?

303 is formulated for free machining, so it breaks chips cleanly and lets the tool run fast. 316L is tougher, galls more easily and forces lower surface speeds with shorter insert life.

The machine is the same. The tooling and the time are not.

How does lot size change the per-piece price?

Setup is fixed. Spread over 10 parts it dominates the price; spread over 1,000 parts it nearly vanishes. That is the whole effect.

If a quote barely moves between 50 and 500 pieces, ask what is inside it.

Does a tighter tolerance double the price?

Only on the dimensions that carry it. Holding ±0.005 mm on one bore adds gauging and possibly a finishing pass. Holding it on every dimension on the print adds time everywhere.

Give the shop the functional tolerances, not the default block tolerance.

What should be excluded from the hourly rate?

Raw material, outside finishing, heat treat, special packaging, freight and formal inspection reports are common exclusions. Some shops also exclude deburring.

Ask for the exclusion list in writing. It is the fastest way to compare two quotes that look different.

How fast can a turning job start?

At GreatLight, quotation and free DFM analysis come back within 12 hours, and production can start within 24 hours once the design is released. Parts typically ship in 3–5 days.

There is no minimum order quantity, from one prototype to 10,000+ part runs.

Send your turning drawing and get the rate basis back

Upload the part and we return a quotation with free DFM analysis within 12 hours, listing the bar size, setup count and finish assumptions behind the number.

12-hour quote±0.005 mm toleranceNo MOQ100% inspection

Get Instant Quote Talk to an Engineer