Real CNC Projects
Prototype, repeat-production, and multi-process CNC parts, told through the actual challenge, the process decisions OUJI made, and the measured result — not a generic capability list.
Case selection
| Option | Best for | Precision / evidence | Volume | Timing | Materials / scope |
|---|---|---|---|---|---|
| 5083 optical-equipment parts | Consistent tool marks and bright machined faces | Owner-reported appearance figures; residual parts reworked | 1,000-part order | Not stated | 5083 aluminum |
| SUS431 precision shafts | Internal burrs affecting function; heat-number identification through outside grinding | Three ground ODs; +0.005 mm requirement; 8.003 mm photographed reading | 2,000 parts per batch | Not publicly stated | SUS431 stainless steel |
| 304 stainless steel 3+2 milling | Multi-face datum relationships through solution treatment, fixturing and inspection | Two CMM position values below programmed limits | 50 parts | Not publicly stated | 304 stainless steel |
| AerMet 100 hard milling | Hard-state finish milling, tool-edge failure and six-part fixturing | 12 characteristics within tolerance on one sampled CMM report | 1,800 parts | No cycle-time or output multiplier claimed | AerMet 100; drawing requirement 51–54 HRC |
| SUS420J2 thin-wall Swiss part | Machining and S2 marking completed within the SP-23 on distortion-sensitive geometry | 17.3 ± 0.02 mm; optical reading 17.310 mm | 1,000 parts | 8 min/part after 10→8 min optimization | Annealed SUS420J2; final hardness requirement HV600 |
| Graphite-insert robot bushing | Small self-lubricating fit features across an external specialist process | Ø16 h7 OD; Ø8 H7 bore; 0.01 mm GD&T | Not publicly stated | Not publicly stated | ZCuZn25Al6Fe3Mn3 brass + graphite |
| Robot gearbox planet carrier | High-volume precision fits across turned and milled datums | 0.01 mm GD&T; P6/H6/h6 fits | 3,300 parts | Not publicly stated | 7075-T6 aluminum |
| 3+2 indexed milling | Multi-face geometry and datum transfer risk | Drawing specifies ⌀0.02 mm position | Prototype / project part | Not publicly stated | EN AW-6082 aluminum |
| Selective post-finish machining | Functional surfaces after black anodizing | Finished-condition feature control | Prototype | Not publicly stated | Aluminum |
| Repeat anodized production | Dimensional stability across repeat finishing batches | Pre- and post-finish control | Repeat production | Not publicly stated | Aluminum |
| Carburized gear turning | Hard-finished gear datum and concentricity risk | Drawing-led hard turning and inspection | Project-specific | Not publicly stated | 20MnCr5 steel |
Swiss-Type CNC · Brass Production
OUJI produced these brass turned parts from C3604 on a Swiss-type turn-mill machine. The custom threaded brass CNC turned parts were sampled every half hour during production for key dimensions and thread depth.
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Optical Equipment · CNC Turning
A 1,000-part order for optical equipment called for consistent tool marks and a bright machined surface. OUJI adjusted the feed and reassessed tool selection to improve the appearance across the batch.
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CNC Turning & Polishing · 6063 Aluminum
OUJI produces this small 6063 aluminum ball-head screw for an automotive application at 100,000 parts per month. A 5.970–6.000 mm ball-diameter requirement had to be met alongside a smooth spherical surface free from scratches, steps and dents. Tool, CNC program and feed optimization, followed by walnut-media tumbling and polishing, established the production route.
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CNC Turning & Precision Grinding · SUS431
For this 2,000-part SUS431 stainless steel batch, OUJI combined rough and finish turning, outsourced centerless grinding and cylindrical grinding of three precision outside diameters under a stated +0.005 mm requirement. Internal burrs could affect the customer’s part function, but OUJI’s existing inspection method could not check inside the bore. OUJI purchased an industrial borescope and introduced 100% internal-bore inspection after deburring. Green heat-number labels kept the parts identified by batch through outside processing.
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3+2 CNC Milling · 304 Stainless Steel
For this order of 50 parts in 304 stainless steel, OUJI combined material preparation, solution heat treatment and controlled workholding with Qiaohong (乔鸿) 3+2 indexed machining. The drawing sets 0.05 mm position requirements for holes on different faces. The published CMM excerpt shows position values of 0.0342 mm and 0.0049 mm, both below their programmed limits. The drawing, machining photographs and inspection excerpt show how the requirements were carried through the production route.
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Hard CNC Milling · AerMet 100 Alloy Steel
A 1,800-part AerMet 100 order moved from a one-part FANUC finish-milling setup to six-part fixturing on a Brother machining center. After the initial cutter chipped at about one part, an Ø8 HARVI I TE KCPM15 end mill was changed at about 20 parts to protect precision-size stability. The published CMM screen records one randomly selected finished part, not a batch capability result.
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Swiss-Type CNC · Stainless Steel
For these stainless steel turned parts, OUJI used Swiss-type machining on the STAR SP-23. The 1,000-part SUS420J2 job was machined in the annealed condition, keeping an approved anonymized 17.3 ± 0.02 mm feature within limits on the documented optical check and stabilizing the machining cycle at 8 minutes per part after an initial 10-minute cycle.
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CNC Turning · Robotics · Brass
A small ZCuZn25Al6Fe3Mn3 bushing combined graphite lubrication inserts with an Ø16 h7 outside diameter, an Ø8 H7 bore and 0.01 mm datum-related geometric controls.
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CNC Turning & Milling · Robotics
A 3,300-part production order used soft-jaw turning, a 12-position milling fixture and ZEISS CMM inspection to control precision fits and 0.01-0.02 mm GD&T across front, rear and rotational features.
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3+2 CNC Milling · Aluminum
A real EN AW-6082 aluminum case using datum-led dovetail fixturing and 3+2 indexed machining to control a drawing-specified ⌀0.02 mm position requirement across multiple faces.
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CNC Milling · Prototype
A prototype needed bare, uncoated aluminum in specific areas with no masking marks — solved by anodizing first, then precision-locating the part for secondary machining.
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CNC Milling · Repeat Production
Multiple related precision dimensions had to survive black hardcoat anodizing batch after batch — solved with 3+2-axis machining and custom tooling to cut setups and control drift.
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CNC Turning · Multi-Process
A 20MnCr5 drawing combined an HRC 58–62 surface-hardness requirement with 0.02 mm concentricity — two requirements that have to be planned together around carburizing distortion.
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