Niles-Simmons N80
Key Specifications
Max Turn Length
max swing diameter
guideway type
live tooling
c axis resolution
steady rests
Overview
The Niles-Simmons N80 is an extra-large CNC turning center from Niles-Simmons Industrieanlagen GmbH in Chemnitz, Germany, designed for the largest shaft, roll, and cylindrical workpieces encountered in heavy industry. With a swing diameter of approximately 800 mm over the bed, the N80 addresses marine propulsion shafts, turbine rotors, large compressor shafts, rolling mill rolls, and industrial crankshafts for large diesel generators and ship engines — components too large for the N40S or N60-MC platforms.
At the 800 mm swing class, workpieces routinely weigh several tons and require exceptional machine rigidity and structural integrity to achieve the part tolerances demanded by energy, marine, and rail customers. Niles-Simmons addresses this through an extra-heavy cast iron bed construction with hydrostatic guideways on the Z-axis — a technology that provides virtually frictionless, stick-slip-free axis motion with high damping characteristics ideal for heavy interrupted cuts and long turning cycles. Steady rests are configured for the machine to support long shafts against deflection during turning.
The N80 includes live tooling with C-axis capability, enabling milling, drilling, and thread milling operations on shaft features including keyways, oil holes, flanges, and coupling interfaces. For marine shaft applications, the machine handles tapered shaft ends, propeller flange faces, and stern tube journal turning in a single clamping. For power generation, the machine turns turbine shaft journals, balancing rings, and coupling flanges.
CNC control is Siemens SINUMERIK 840D sl with Niles-Simmons' application software for heavy shaft machining, including measurement cycles for in-process diameter verification, thermal compensation for long workpieces that expand during machining, and shaft deflection compensation based on workpiece weight and overhang. The machine is typically customized per order to the customer's specific shaft family — standard turning length options extend from 6,000 to 12,000 mm or beyond for specialized applications.
Full Specifications
| Parameter | Value |
|---|---|
| Max Swing Diameter | ~800 mm (31.5 in) over bed |
| Max Turning Length | 6,000 - 12,000 mm (configurable) |
| Guideway Type | Hydrostatic Z-axis guideways, box slideways for X-axis |
| Live Tooling | Yes — milling and drilling with C-axis |
| C Axis Resolution | 0.001 deg |
| Steady Rests | Multiple steady rests for long shaft support |
| Workpiece Type | Marine shafts, turbine rotors, compressor shafts, mill rolls, large crankshafts |
| In Process Measurement | Yes — diameter verification cycles |
| Thermal Compensation | Yes — for long workpiece thermal expansion |
| CNC Control | Siemens SINUMERIK 840D sl with Niles-Simmons heavy shaft machining software |
| Connectivity | OPC-UA, Industry 4.0 ready |
| Max Workpiece Weight | 20,000+ kg (depending on tailstock and steady rest configuration) |
| Sun | Mon |
Strengths & Limitations
Strengths
- 800 mm swing over bed handles the largest industrial shafts found in marine propulsion, power generation, and rolling mill applications
- Hydrostatic Z-axis guideways eliminate stick-slip for smooth, vibration-damped cutting on heavy workpieces — critical for surface finish on large journal diameters
- In-process diameter measurement with thermal compensation ensures accuracy on long workpieces that expand significantly during multi-hour machining cycles
- Live tooling with C-axis eliminates secondary setups for milling, drilling, and threading operations on shaft features
- Niles-Simmons' deep specialization in heavy shaft machining brings application engineering expertise not available from general turning machine suppliers
- Custom configuration per shaft family ensures the machine is precisely matched to the customer's production requirements
Limitations
- Investment cost in the $1.2M-$2M range requires substantial production volume and part value to justify
- Long lead times from the Chemnitz factory — 18-30+ months for large custom-configured machines
- Hydrostatic guideway system requires hydraulic power unit maintenance and controlled oil temperature to maintain performance
- Highly specialized machine with limited resale market — exit from investment is difficult if production programs change
- North American service support requires coordination with German engineers for complex maintenance and software issues
Best For
Frequently Asked Questions
01
The Niles-Simmons N80 typically prices between $1,200,000 and $2,000,000 new, with custom configurations for specific shaft families potentially exceeding this range. The N80 is a purpose-built capital investment configured to the customer's production requirements.
02
Hydrostatic guideways float the Z-axis carriage on a film of pressurized oil rather than metal-to-metal contact. This eliminates stick-slip, provides inherently high damping of cutting vibration, and wears negligibly over decades of service. For heavy shafts where interrupted cuts and high cutting forces are routine, hydrostatic guideways provide superior surface finish and geometric accuracy compared to conventional slideways.
03
Turning length on the N80 is configurable from approximately 6,000 mm up to 12,000 mm or beyond for custom requirements. Most marine and turbine shaft applications fall in the 3,000-8,000 mm length range, which the N80 handles with standard bed configurations.
04
Yes. Marine propeller shaft machining is one of the primary applications for the N80. The machine handles tapered propeller shaft ends (propeller taper and coupling taper), journal surfaces for stern tube bearings, flange faces, keyways, and oil distribution bores — all in a single or two-setup sequence.
05
The N80 uses in-process diameter measurement cycles that check the workpiece at programmed intervals and adjust tool offset to compensate for measured deviation. Thermal compensation software tracks workpiece elongation during machining and adjusts Z-axis positioning accordingly. Multiple steady rests support the workpiece to prevent sag-induced diameter variation at unsupported spans.
Community Discussions
Community discussion — have any of you ever heard of "Niles Simmons" before?
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Community discussion — old niles lathe and unknown shapper being donated to me.
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