Nodular iron machines nothing like steel or aluminum. We cut it on 127 CNC machines, hold ±0.005 mm, and check every part before it ships. Send a drawing and get a quote plus DFM notes in 12 hours.
These are the failure modes we hear about most often from engineers who tried ductile iron elsewhere.
Nodular iron has high damping, yet thin walls still sing. The usual cause is a cutter with too many flutes and too much radial engagement. We drop to a 4-flute variable-helix cutter, keep radial width under 8 percent of diameter, and the chatter goes away.
The hard nodules in ductile iron wear carbide fast. If your shop runs the same insert across a long roughing cycle, the last parts drift out of tolerance. We track wear per operation and index inserts on a fixed count, not on a hunch.
The graphite spheres create micro-interruptions at the cutting edge. Too light a feed rubs instead of cuts and pulls out the carbide. We keep feed per tooth above 0.08 mm for roughing, which keeps the edge in the material and the surface clean.
A dull tool or a dry pass leaves a hard white layer that ruins the next operation. It looks fine under a light. We use high-pressure coolant through the tool and cap surface speed so the cut stays below the transformation temperature.
Two things decide whether a nodular iron part comes out right: the toolpath strategy and how the material behaves at the edge.
Ductile iron is not a single material. A ferritic grade cuts like 1018 steel; a pearlitic or austempered grade fights back. We look at the grade and the hardness on the drawing before we pick a cutter, not after the first part fails.
For roughing we favor variable-helix carbide with a tough PVD coating and through-tool coolant. For finishing we switch to a sharper edge geometry and reduce radial engagement. That combination holds Ra 0.8–1.6 μm on most faces without a separate grinding step.
Castings arrive with draft, parting lines and as-cast surfaces. Clamping on a raw surface moves the part, and a moved part scrapped after five hours of machining is the worst kind of loss.
We fixture on the datum faces the drawing calls out, or we machine a soft-jaw pocket first. For larger housings we use the Ø400 mm rotary table on a 4-axis mill so three faces come off in one setup. That removes the stacked-tolerance error you get from re-fixturing.
A quick starting point. Send the drawing and we will confirm against your actual geometry.
| Grade | Typical use | Machining note |
|---|---|---|
| Ferritic (60-40-18) | Valve bodies, pump housings | Cuts free, best surface finish |
| Pearlitic (80-55-06) | Gears, crankshafts, brackets | Lower speed, watch tool wear |
| Austempered (ADI) | Suspension, high-wear links | Hard, needs rigid setup and sharp edges |
| As-cast skin | Any part with raw surfaces | Interrupted cut, reduce feed at entry |
One shop for the machining, the finishing and the inspection report.
3-axis, 4-axis and mill-turn work on cast and pre-machined blanks. Up to 4,000 mm in one setup.
16 simultaneous 5-axis centers for contoured ports, angled holes and parts with five-sided features.
One-off nodular iron parts for fit checks before you commit to a casting pattern or a production run.
Bead blasting, tumbling, black oxide, plating and powder coating, matched to the service environment.
Raw material check, in-process monitoring and final inspection. Dimensional reports on request.
From a single prototype to 10,000+ part runs. No minimum order quantity stands in the way.
| Capability | Range | Best for |
|---|---|---|
| Max part size | 4,000 mm | Long housings and rails |
| Large travel | 4,000 × 400 × 150 mm | Elongated castings |
| Medium travel | 750 × 1,150 × 550 mm | Pump and gearbox bodies |
| Compact travel | 500 × 500 × 450 mm | Brackets and small covers |
| Rotary table | Ø400 mm | Multi-face work in one setup |
| Tolerance | ±0.005 mm | Bearing bores and mating faces |
Data from our Dongguan and Singapore plants.
Fifteen years of production machining, three wholly-owned plants and 7,600 m² of floor space.
Held on production ductile iron parts, not just on a lab sample. That is ±0.0002 in.
Parts that pass final inspection. Every shipment is checked before it leaves the dock.
Including 16 simultaneous 5-axis centers and 16 mill-turn centers under one roof.
Machinists, programmers and inspectors who work on castings every week.
Quotation plus free DFM analysis within 12 hours. Production can start within 24.
Nodular iron brackets and housings that must survive vibration and hold bore alignment.
Pump bodies and gearbox covers with machined faces that have to seal on the first try.
Heavy castings where flatness and hole position drive the assembly, not the finish.
Yes. We machine the part, then run bead blasting, tumbling, black oxide, plating or powder coating in the same plant.
That keeps the part from bouncing between vendors and keeps the finish spec tied to the machining spec.
Down to ±0.005 mm on features we can reach with a rigid setup, such as bores and mating faces.
As-cast skin and interrupted cuts are a different case. On those surfaces we plan for a rougher allowance and confirm the number in the DFM review.
Both work. Some customers send pre-cast blanks they already have. Others ask us to source and pre-machine the casting.
If you send blanks, include the as-cast drawing so we can plan the stock allowance before we quote.
Nodular iron is stronger and tougher, so it takes more cutting force and wears tools faster than gray iron.
The trade is worth it when the part sees impact or fatigue. If the part is only a static cover, gray iron is cheaper to cut.
If the part is small, thin and highly detailed, a machined aluminum or steel part is usually faster and cheaper.
Ductile iron pays off on larger parts with thick sections, vibration damping needs, or wear resistance that a casting grade gives you.
A 3D model or 2D drawing with tolerances, the grade and hardness, the quantity, and the finish you want.
If the part is a casting, tell us whether you supply the blank or need us to. We return a quote and DFM notes within 12 hours.
None. One prototype is fine, and so is a 10,000+ part run.
For a single part we still run the same inspection routine as a production batch.
Uploads are secure and confidential. We can sign an NDA before you send files if your process requires it.
Files are held under access control and are not shared outside the project team.
Upload your drawing and we will return a price plus DFM notes within 12 hours. One prototype or ten thousand, the same shop handles it.
12-hour quote100% inspectionNo minimum orderNDA available
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Upload your 3D model or 2D drawing and get a quotation with a free DFM analysis. Maximum processing size 4,000 mm.
CNC Metals 13 grades
CNC Plastics 10 grades
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