VT machining provides CNC Broaching Aluminum for customers who need accurate, repeatable Aluminum components. Because Aluminum is lightweight, excellent machinability, good corrosion resistance, we adapt the process to suit — controlling the variables that matter for this alloy.
Process Data for CNC Broaching Aluminum
| Broaching speed (HSS-E) | 10-20 m/min |
|---|---|
| Rise per tooth | 0.05-0.10 mm |
| Lubricant | Sulphurised broaching oil |
Shown for 6061 Aluminum, the most common Aluminum grade we see for CNC Broaching. Typical values for 6061 Aluminum, T6 / T651; confirmed on the first part.
CNC Broaching Capability for Aluminum
- Keyways & splines
- Internal profiles
- One-pass forming
- High repeatability
Aluminum material properties, finishing options and grade notes are on our CNC Milling Aluminum page.
How CNC Broaching Aluminum Works
Rotating multi-flute cutters remove material as the Aluminum workpiece is driven through programmed tool paths on 3-, 4- or 5-axis machining centres. Climb milling, step-over and depth-of-cut are set so chip load stays in the ideal band for the alloy.
Every job begins from your CAD model or 2D drawing. Fixturing and tool paths are planned so the most critical dimensions are produced in the most rigid, repeatable setup. Critical dimensions are checked on the first part and monitored through the run.
Achievable Tolerances for CNC Broaching Aluminum
| Feature | Standard | Precision |
|---|---|---|
| Linear dimension (< 100 mm) | ±0.05 mm | ±0.010 mm |
| Linear dimension (100–300 mm) | ±0.10 mm | ±0.025 mm |
| Hole diameter (reamed) | H9 | H7 |
| True position of hole pattern | ±0.10 mm | ±0.025 mm |
| Flatness over 100 mm | 0.05 mm | 0.015 mm |
| Perpendicularity | 0.10 mm | 0.020 mm |
| Surface finish, as machined | 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.
CNC Broaching Tolerances & Surface Finish
For CNC Broaching, dimensional and positional tolerances around ±0.01 mm are routine, tightening toward ±0.005 mm on precision setups. Surface finish on machined faces typically falls in the Ra 0.4–1.6 µm range depending on tooling and pass strategy.
Final tolerances are governed by the material's behaviour, wall thickness and overall stiffness. We give honest DFM feedback if a callout would be costly or better achieved another way.
Design Tips for CNC Broaching Aluminum
A few design choices make a real difference to cost and quality. Generous internal radii, sensible pocket depth-to-width ratios and avoiding very thin unsupported walls all reduce cost and improve accuracy in Aluminum. If you send your model early, we will return practical DFM feedback before you commit to production.
Applications of CNC Broaching Aluminum
CNC Broaching of Aluminum supports parts across aerospace, medical, automotive, electronics, semiconductor, energy and general industrial sectors. We scale from one-off prototypes to ongoing production while holding the same quality.
Typical Aluminum Parts for CNC Broaching
Illustrative examples of CNC Broaching Aluminum 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.
Robot end-effector bracket
- Material
- Aluminum
- Size
- 180 × 90 × 30 mm
- Key callouts
- Bore pair concentric within 0.02 mm, weight reduction pockets
- Batch
- 120 pcs
Pockets ganged so wall thickness never drops below 2 mm at the load path.
Sensor housing
- Material
- Aluminum
- Size
- 86 × 54 × 22 mm
- Key callouts
- Pocket depth ±0.02 mm, bore H7, flatness 0.015 mm
- Batch
- 250 pcs / quarter
O-ring groove finished in the same setup as the sealing face so the two stay parallel.
Optical mount plate
- Material
- Aluminum
- Size
- 160 × 160 × 12 mm
- Key callouts
- Hole pattern true position ±0.02 mm, flatness 0.01 mm
- Batch
- 40 pcs
Roughed, stress-relieved overnight, then finished — the plate is too thin to hold flatness in one hit.
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 Broaching Aluminum
- 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 Aluminum 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 Broaching
Other Processes for Aluminum
Send the drawing, the Aluminum 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 is CNC Broaching Aluminum and how is it done?
CNC Broaching Aluminum refers to broaching pushes a toothed tool through or across a part to form keyways, splines and internal profiles. Applied to Aluminum — lightweight, excellent machinability, good corrosion resistance — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
What tolerances can you hold for CNC Broaching Aluminum?
Achievable tolerances for Aluminum machining depend on the alloy, geometry and feature size. Milling holds positional and dimensional tolerances to around ±0.01 mm, tighter with precision setups. Exact figures are confirmed against your drawing callouts.
Does CNC Broaching Aluminum require dedicated tooling?
Most Aluminum machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
What is the typical lead time and minimum order for CNC Broaching Aluminum?
CNC Broaching prototypes for Aluminum can be produced quickly and scaled to series production. Send your drawing and quantity and we will advise lead time and any minimum order.
Which industries use CNC Broaching Aluminum parts?
CNC Broaching Aluminum parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise Aluminum components are required.
What material thickness or size range suits CNC Broaching Aluminum?
We machine Aluminum across a broad size range; share your part envelope for confirmation.