What a CNC lathe actually does
A CNC lathe rotates a workpiece against a controlled cutting tool to produce round, concentric features such as shafts, bushings, spacers, fittings, pins, and threaded connectors. The turret indexes tools under CNC control, the spindle holds a tight RPM, and the machine repeats the same part hundreds or thousands of times. On a modern CNC turning center, feature-to-feature concentricity and diameter control are far tighter than anything achievable by hand.
Typical control you can plan around:
- General turning tolerance: +/-.005 in on diameters and lengths.
- Precision turning: +/-.001 in on critical diameters.
- Tight turning: +/-.0005 in on bearing fits and mating bores, held with a finish pass and controlled tool wear offsets.
- Surface finish: Ra 63 to 125 uin as roughed, Ra 32 as-turned with a sharp insert, Ra 16 uin with a dedicated finish pass, and Ra 8 uin or better with a follow-on grind or polish.
Bar-fed lathe vs chucker: which turning setup fits your part
The single biggest cost and quantity decision on a turned part is bar-fed vs chucker. It comes down to how the raw material is presented to the spindle.
Bar-fed lathe
A bar-fed lathe pulls long bar stock through the spindle with an automatic bar feeder. The part is cut off after each cycle, so the machine can run unattended through a full bar. This is the right path for higher volumes of small to mid diameter parts.
- Best for round stock roughly 0.125 in to 2.5 in diameter through the spindle bore.
- Ideal at 100 to 100,000-plus pieces, where lights-out running slashes cost per part.
- Common materials: 303 and 304 stainless, 316 stainless, 12L14 and 1215 free-machining steel, 4140, 6061-T6 and 7075 aluminum, C360 brass, and 660 bronze.
Chucker
A chucker grips a pre-cut blank, casting, forging, or a large diameter workpiece in the chuck. It is the right choice for large parts, short runs, and second operations.
- Best for diameters larger than the spindle bore, or for parts made from castings and forgings.
- Economical for prototypes and low volume, typically 1 to 250 pieces.
- Handles heavier wall parts, flanges, and hub-style geometry that will never pass through a bar tube.
Live tooling: milling and drilling on the turning center
Live tooling (also called driven tooling) adds rotating tools to the turret so the lathe can drill, mill, tap, and slot while the part is still chucked. This collapses multiple setups into one, which protects concentricity and removes handling error.
With live tooling on a turn-mill machine you can produce in one setup:
- Cross-drilled and cross-tapped holes on the OD.
- Milled flats, hex forms, and wrench pads.
- Face-milled slots, keyways, and D-flats.
- Tapped holes to 3/4-16 and larger without a secondary machine.
Single-setup machining matters for tolerance stacking. Every time a part is re-chucked on a separate machine, you risk another +/-.001 in to +/-.002 in of position error. Doing it complete on one CNC turning center keeps that stack out of the part.
Y-axis turning: off-center features done right
A Y-axis lathe moves the turret perpendicular to the spindle centerline, not just radially. That geometry lets the machine mill features that sit off the part center rather than on it.
- Flat-bottomed pockets and slots that are not on centerline.
- Deeper, straighter milled faces with better finish than a C-axis-only machine.
- Hex and square drive features milled true, not skived.
If a drawing calls for a hex, an off-center keyway, or a milled boss on a turned part, a Y-axis turn-mill machine finishes it complete instead of routing it to a separate mill.
How Wexmar runs turning
Wexmar turns on 10 Mazak and Doosan lathes in Canastota, NY, spanning bar-fed and chucker work with live tooling and Y-axis capability. Parts are inspected in-house on a Brown & Sharpe coordinate measuring machine, and we support first article inspection (FAI) and full dimensional reports. Material is sourced with material certifications and DFARS-compliant traceability, and all work is made in the USA and shipped nationwide. See our CNC turning capabilities for machine envelopes and material list.
What CNC turning costs
Price on a turned part is driven by cycle time, material, setup, and inspection. The ranges below are typical illustrative estimates, not binding quotes. Your real number depends on tolerance, finish, quantity, and material.
| Cost driver | What it covers | Typical range |
|---|---|---|
| Setup / programming | Program, tooling, first article, offsets | $85 to $450 per setup |
| Material | Bar stock or blank, per part | $0.75 to $28 per part |
| Machine time | Turning center run time | $65 to $135 per hour |
| Live tooling / Y-axis ops | Cross-drill, mill, tap in one setup | $10 to $60 per part |
| Finishing | Deburr, chamfer, passivate, plate | $0.50 to $12 per part |
| CMM inspection / FAI | First article and in-process checks | $60 to $300 per lot |
Lead time
- Prototype / 1 to 25 pieces: 1 to 3 weeks.
- Production run / 100 to 5,000 pieces: 3 to 6 weeks depending on material lead time.
- Expedite: Available on many jobs, priced case by case.
Quick decision guide
- Small round part, higher volume, fits through the spindle: run it bar-fed.
- Large diameter, casting, forging, or low volume: run it as a chucker.
- Needs cross-holes, flats, or tapping: specify live tooling so it finishes in one setup.
- Needs off-center milled features or a true hex: specify a Y-axis turn-mill machine.
Send a print and quantity for a real number. Start at our instant quote page, or review our inspection and quality process to see how tolerances are verified before parts ship.