Looking for reliable CNC Lathe Machining Brass? VT machining manufactures Brass parts to tight tolerances and consistent quality. Brass is free-machining, good conductivity, attractive finish, so the process is set up specifically for the material.
Starting Parameters for CNC Lathe Machining Brass
| Cutting speed (carbide) | 320-640 m/min |
|---|---|
| Feed | 0.1-0.35 mm/rev |
| Spindle speed, Ø25 mm bar | 4070-8150 rpm |
| Insert / tool class | ISO N — sharp, polished, uncoated or DLC |
| Coolant | Dry or light emulsion; zero-rake tools to prevent grabbing |
| Max turning diameter | Ø350 mm (chuck work) |
Shown for C360 Brass, the most common Brass grade we see for CNC Lathe Machining. Starting values for C360 Brass, Half-hard; optimised on the first article.
CNC Lathe Machining Capability for Brass
- Live-tool capability
- Sub-spindle pickup
- OD/ID + cross features
- Diameter tolerance ±0.005 mm
Brass material properties, finishing options and grade notes are on our CNC Turning Brass page.
How CNC Lathe Machining Brass Works
The Brass bar or billet rotates in the spindle while single-point tools shape outer diameters, bores, faces, grooves and threads. Constant surface speed control keeps cutting conditions stable from large to small diameters.
We start from your supplied geometry and tolerance scheme. The setup is designed to minimise re-clamping, which protects positional accuracy across features. A first article is verified against the drawing before the balance of the batch is released.
Achievable Tolerances for CNC Lathe Machining Brass
| Feature | Standard | Precision |
|---|---|---|
| Outside diameter | ±0.05 mm | ±0.005 mm |
| Bore diameter | H9 | H6 |
| Length / shoulder position | ±0.10 mm | ±0.020 mm |
| Concentricity OD to ID | 0.05 mm TIR | 0.010 mm TIR |
| Roundness | 0.02 mm | 0.005 mm |
| Thread class | 6g / 2A | 4h / 3A |
| Surface finish, as turned | Ra 1.6 µm | Ra 0.4 µm |
Standard is what a normal quotation assumes. Precision is available on nominated features and is priced separately, because it needs extra setups, in-process gauging and CMM verification. Call out only the features that need it — blanket-tightening a drawing is the single most common reason a quote comes back expensive.
Design Tips for CNC Lathe Machining Brass
Small design adjustments often cut cost and lead time. Consistent diameters, standard thread forms and avoiding extremely long, slender features help Brass turned parts stay concentric and economical. If you send your model early, we will return practical DFM feedback before you commit to production.
CNC Lathe Machining Tolerances & Surface Finish
Turned Brass holds diameter tolerances to about ±0.005 mm with concentricity within 0.01 mm and good roundness. Turned finishes of Ra 0.4–0.8 µm are achievable with finishing passes and sharp tooling.
The tightest tolerances are reserved for the features your drawing flags as critical. Share your tolerance scheme and we will confirm what is realistic before quoting.
Applications of CNC Lathe Machining Brass
Brass parts made this way are found throughout aerospace, medical, automotive, electronics and industrial equipment. Prototype, bridge and production volumes are all welcome.
Typical Brass Parts for CNC Lathe Machining
Illustrative examples of CNC Lathe Machining Brass parts and the callouts that usually drive the process plan. They show the kind of work that fits this process; they are not specific customer orders.
Bearing spacer
- Material
- Brass
- Size
- Ø35 / Ø22 × 9 mm
- Key callouts
- Thickness ±0.005 mm, parallelism 0.005 mm
- Batch
- 4,000 pcs
Turned then double-disc ground — thickness this tight is not a lathe job.
Nozzle body
- Material
- Brass
- Size
- Ø12 × 46 mm
- Key callouts
- Ø0.6 mm orifice ±0.01 mm, internal taper 20°
- Batch
- 600 pcs
Orifice EDM-drilled after turning; a drill wanders at that diameter.
Connector pin
- Material
- Brass
- Size
- Ø3.0 × 24 mm
- Key callouts
- OD ±0.005 mm, straightness 0.02 mm over length
- Batch
- 20,000 pcs
Swiss-turned from bar with a guide bushing; nothing else holds Ø3 mm over 24 mm.
No drawing yet? Build one in the browser.
Set the metal, dimensions and features, watch the 3D model update as you type, then switch to the 2D sheet to add dimensions and tolerances. Download it or send it straight to us with your RFQ.
What We Need to Quote CNC Lathe Machining Brass
- GeometrySTEP or IGES for the 3D model, plus a PDF drawing if you have tolerance callouts. A dimensioned sketch is enough to start.
- MaterialThe exact Brass grade and condition — temper, heat-treat state or hardness. If you are not sure, tell us the function and we will suggest one.
- QuantityPrototype count and the expected annual volume. Both change how the part is made and therefore what it costs.
- TolerancesWhich features are critical. Everything else runs to our standard tolerance, which is what keeps the price sensible.
- FinishSurface treatment, cosmetic requirements, and any faces that must be masked.
- DocumentsWhether you need a material certificate, dimensional report, FAIR or PPAP with the shipment.
Missing something from the list is not a problem — send what you have. We will come back with the specific questions rather than a generic form.
Other Metals for CNC Lathe Machining
Other Processes for Brass
Send the drawing, the Brass grade and the quantity. You get pricing, lead time and any DFM notes back — usually within one business day.
Request a QuoteFrequently Asked Questions
What material thickness or size range suits CNC Lathe Machining Brass?
Turned Brass parts are produced from bar or chuck stock across a wide diameter range.
What surface finish is achievable on Brass with CNC Lathe Machining?
Surface finish on Brass is controlled to your specification; we confirm the achievable Ra against your callout.
Does CNC Lathe Machining Brass require dedicated tooling?
Most Brass turning work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
Can VT machining make custom Brass parts to my drawing?
Yes. Brass turning is made to order from your CAD/2D drawing. Share your geometry, material grade, tolerance and quantity and we will confirm feasibility, lead time and pricing.