Nomura NN-25

For a typical common rail injector body blank (22 mm diameter, stainless 303, 5 turning operations + 2 drilling): Single-spindle CNC turning center: 60-90 seconds = 40-60 parts/hour. Nomura NN-25 at 6 spindles: 10-18 seconds cycle per station = 200-360 parts/hour. Throughput advantage: 4-6x. For an automotive Tier 1 running 2,000,000 injector blanks annually, the NN-25 requires approximately 5,600-10,000 machine hours vs 33,000-50,000 hours for single-spindle turning. In practice, this means 4-6 NN-25 machines replace 20-30 CNC turning centers, with proportional reductions in floor space, operator headcount, and tooling cost per piece.

Nomura NN-25 (25 mm max) vs NN-27 II (27 mm max): The NN-27 II provides a 2 mm additional bar capacity over the NN-25, opening access to components in the 25-27 mm range including small hydraulic cylinder rod ends and certain connector body profiles. For shops whose entire production portfolio falls within 25 mm, the NN-25 may provide slightly optimized spindle speed and rigidity at its rated capacity. For shops with any parts requiring 25-27 mm bar, the NN-27 II is the better investment, providing the broader range without significant cost penalty. In most cases where both machines would serve, the NN-27 II is preferred for its additional flexibility.

The NN-25 supports automotive production quality requirements through: (1) IATF 16949 process capability — the machine's 0.005 mm positioning accuracy enables Cpk > 1.33 on typical automotive tolerances of ±0.025-0.050 mm; (2) PPAP First Article requirements are supported through statistical sampling capability with Fanuc 30i data logging; (3) SPC data export for critical dimensions via Fanuc Data Server or third-party SPC interfaces; (4) Tool life management and automatic tool change alerts to maintain process control; (5) Material lot traceability supported through machine run records. Formal IATF 16949 certification of the production process is the customer's responsibility but the NN-25 provides the necessary equipment capabilities to support certification.

Setup time on the NN-25 for a complete job changeover (different part family, different bar diameter in range): (1) Program call-up and review — 15-30 minutes; (2) Tool changeover at all 6 stations (replace and set 12-18 tools) — 2-4 hours; (3) Bar feeder collet and guide bush change for new diameter — 30-60 minutes; (4) First-off parts and dimensional verification — 1-2 hours; (5) Offset adjustments to achieve print dimensions. Total: 4-8 hours for a complete changeover. For part families sharing the same bar diameter with only tooling changes: 2-4 hours. This compares favorably to mechanical cam multi-spindles (cam change and grinding: 16-40 hours) and justifies the NN-25 for mixed-model production programs down to 20,000-50,000 parts per run.

Yes. Stainless 316L is a common material on the NN-25 for fuel system and hydraulic fittings. Machining parameters for 316L at 20-25 mm diameter: cutting speed 80-120 m/min for turning with coated carbide (TiAlN or AlTiN); feed 0.05-0.15 mm/rev; depth of cut 0.5-2.0 mm for roughing, 0.1-0.3 mm for finishing. The NN-25's 6,000 RPM spindle gives 376-471 m/min surface speed at 20 mm diameter — well above the 80-120 m/min recommended range, meaning the machine operates at reduced RPM for 316L roughing. Drilling 316L requires: HSS-Co or carbide drills, 20-40 m/min cutting speed, high-pressure through-tool coolant at 70+ bar, and positive-rake drill geometry to prevent work-hardening at the hole bottom. The NN-25's coolant system should be specified with high-pressure capability for stainless drilling operations.