Star SU NXT
Image: star-su.com, Star SU
Key Specifications
Max Spindle
Spindle Power
Max Workpiece ⌀
x axis travel
y axis travel
z axis travel
How much does the Star SU NXT cost?
Price estimate
We do not have a price for the Star SU NXT that we can stand behind, so we show no number. Configuration, options and installation move the final price a long way: a quote is the reliable figure.
Overview
The Star SU NXT is a 5-axis CNC tool and cutter grinder with X, Y and Z travels of 506 mm (19.9 in), 650 mm (25.6 in) and 768 mm (30.2 in) in a base machine that measures 2,300 x 2,032 x 2,284 mm. Star Cutter builds it on one modular platform, and the same machine is configured for regrinding, for producing new round tools or for sharpening gear cutting tools.
The grind zone is the reason to look at it. Maximum workpiece diameter is 254 mm (10 in), grind length is 381 mm (15 in) for end work and 406 mm (16 in) for fluting, and the wheel changer takes wheels of 203.2 mm (8 in). Star Cutter adds that workpieces up to 12 in fit when a smaller wheel is chosen. For gear tools the brochure states hobs up to 8 in OD x 10 in OAL.
All three linear axes run at 50 m/min on linear motors, which Star Cutter uses in place of ball screws, and the rotary axes have direct-drive torque motors. The base is mineral cast and a closed-loop chilling system keeps it thermally stable. Feedback comes from linear glass scales with a resolution of 0.00001 mm.
Two grinding spindles are offered, both with automatic HSK clamping: 15 kW at 24,000 RPM for regrinding and small wheels, and 28 kW at 20,000 RPM for all-purpose manufacturing. Up to 5 wheel packs sit in the changer with their coolant manifolds. Loading by a Fanuc 200iD robot is an option; it works from four pallets and takes parts up to 305 mm (12 in) long. The control is the Flexium+ CNC with NUMROTO software.
Full Specifications
| Parameter | Value |
|---|---|
| X Axis Travel | 506 mm (19.9 in) |
| Y Axis Travel | 650 mm (25.6 in) |
| Z Axis Travel | 768 mm (30.2 in) |
| B Axis Range | +/- 120° grinding spindle swivel (12 rpm) |
| C Axis Headstock Speed | 1,000 rpm (360° rotation) |
| Rapid Traverse Xyz | 50 m/min (1,968.5 in/min) |
| Max Workpiece Diameter | 254 mm (10 in); up to 12 in with smaller grind wheel selection |
| Max Grind Length End Work | 381 mm (15 in) |
| Max Grind Length Fluting | 406 mm (16 in) |
| Max Spindle Speed | 20,000 rpm |
| Spindle Motor Power | 28 kW (38 hp) peak |
| Spindle Options | 15 kW at 24,000 RPM (Auto HSK) or 28 kW at 20,000 RPM (Auto HSK) |
| Wheel Size | 203.2 mm (8 in) with wheel changing; 12 in maximum with no wheel changing, manifold and probing |
| Linear Feedback Resolution | 0.00001 mm (0.0000004 in) |
| Min Programmable Increment Rotary | 0.0001 deg |
| C Axis Feedback Resolution | 0.000068 deg |
| B Axis Feedback Resolution | 0.00000006 deg |
| CNC Control | Flexium+ CNC with NUMROTO |
| Machine Dimensions | 2,300 x 2,032 x 2,284 mm (7 ft 6 in x 6 ft 6 in x 7 ft 5 in) (L x W x H, base machine) |
| Machine Weight | 5,964 kg (13,150 lbs) base machine |
Specifications sourced from star-su.com — verified 2026-10-05
Strengths & Limitations
Strengths
- X, Y and Z travels of 506 mm (19.9 in), 650 mm (25.6 in) and 768 mm (30.2 in) give room for workpieces up to 254 mm (10 in) in diameter
- Linear motors on the linear axes and direct-drive torque motors on the rotary axes, with travel speeds of 50 m/min
- Choice of a 28 kW, 20,000 RPM spindle or a 15 kW, 24,000 RPM spindle, both with automatic HSK clamping
- Wheel changer with up to 5 storage locations loads wheel packs together with their coolant manifolds
- Mineral cast base with a closed-loop chilling system for thermal stability
Limitations
- Wheels in the changer are limited to 203.2 mm (8 in); the 12 in wheel size applies only with no wheel changing, manifold and probing
- Robot loading, the 12,000 RPM wheel dresser, the traveling W-axis and laser marking are options, not part of the base machine
- The base machine weighs 5,964 kg (13,150 lbs), so floor loading and rigging need checking before delivery
- Automatic loading stops at parts 305 mm (12 in) long and 6.5 lb (3 kg) each; longer or heavier tools are loaded by hand
Best For
Frequently Asked Questions
01
Up to 254 mm (10 in) in diameter as standard, and Star Cutter states up to 12 in with a smaller grinding wheel. Grind length is 381 mm (15 in) for end work and 406 mm (16 in) for fluting. With the optional robot, parts are loaded automatically up to 305 mm (12 in) long.
02
Two, both with automatic HSK clamping. The 15 kW spindle runs to 24,000 RPM and is meant for manufacturing, regrinding and high-speed work. The 28 kW spindle runs to 20,000 RPM and is the all-purpose choice for manufacturing. The specification table is written for the 28 kW (38 hp) version.
03
Star Cutter integrates a Fanuc 200iD robot as an option. It comes with four pallets, two for blanks and two for finished parts, and it can load, unload and flip parts so that both ends are ground. A single part can weigh up to 6.5 lb (3 kg), and the standard gripper takes diameters from 5 to 32 mm.
04
The NXT runs the Flexium+ CNC with NUMROTO, a software package for producing and resharpening tools. The rotary axes are programmed in steps of 0.0001 deg, and the linear glass scales resolve 0.00001 mm. For medical tooling Star Cutter also supplies the machine with ESPRIT CAM as a packaged solution.
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