Compact Tool Grinder Offers Large Grinding Zone

March 17, 2021

The Star NXT 5-axis Tool Grinder is a versatile 5-axis CNC machine with a small footprint and a large grind zone. Designed in a modular fashion that offers quick adaptation to application requirements, the NXT’s mechanical, software, and automation features and functions have been updated.


Mechanical improvements to the NXT design provide higher system rigidity and improved contamination containment, as well as wash down bed and coolant boost pump upgrade options. The machine’s control software now features the latest Flexium Tools with NUMROTO 4.2.0, as well as an innovative solution for freeform grinding using ESPRIT CAD/CAM capability with 3D simulation and special capability for medical components.


The updated automation package accommodates denser pallet arrays for improved lot sizes and runtime while delivering smoother robot operation and better repeatability. Additionally, the system can now adapt to multiple part profiles to be produced within a single run. An optional laser marking system has also been integrated for automated tool marking, in addition to many other new features.


Standard and custom options for process enhancement are available, including a new clearance-optimized flip-up and air-actuated tailstock and new work holding solutions. Real-time tracking of temperatures, spindle hours, bearing travel distances have been added for improved preventative maintenance functionality.


The NXT 5-axis Tool Grinder has a 6.5 by 7.5 ft footprint with a 30.2 x 19.9 x 25.6 in. (LWH) grinding zone and the ability to run tools up to 10-in. in diameter. It has an optional 28kW synchronous spindle capable of 20,000 RPM and Fanuc robot automation with 0.196 to 1.250 in. (5 to32 mm) gripper assembly, as well as best-in-class NUMROTO grinding software. Backed by application support, the Star Cutter NXT grinders are designed, manufactured, and serviced in the United States.

  • Focused design to deliver a maximized grind zone with a minimal footprint
  • Capable of 15-in. end work, 10-in. diameter parts, utilizing up to 8-in. wheels
  • Machine centered wheel changing capability with up to (5) storage locations
  • Auto-lube grease system for worry-free maintenance
  • High-resolution linear glass scales
  • Linear motors instead of ball screws to eliminate backlash, friction effects, and drive vibration
  • 24 hour service response time
  • Manufactured in the USA
  • Grinding spindle options
Base Machine Dimensions (L x W x H)mm2,300 x 2,032 x 2,284
Total Weight: Base Machinekg5,964
Maximum Workpiece Diameter *mm254
Maximum Grind Length, End Workmm381
Maximum Grind Length, Flutingmm406
C-Axis Headstock Spindle 360° Rotationrpm1,000
B-Axis Grinding Spindle Swivel +/- 120°rpm12
X-Axis Horizontal Travelmm506
X-Axis Travel Speedm/min50
Y-Axis Vertical Travelmm650
Y-Axis Travel Speedm/min50
Z-Axis Horizontal Travelmm768
Z-Axis Travel Speedm/min50
Grinding Spindle Max. Speedrpm20,000
Peak Spindle Powerkw28
Grinding Wheel Diameter (Wheel Changing) **mm203.2
Smallest Programmable Movement - Linearmm0.001
Linear Axis Glass Scale Feedback Resolutionmm0.00001
Smallest Programmable Movement - Rotarydegree0.0001
Rotary Axis Feedback Resolution: A-axisdegree0.000068
Rotary Axis Feedback Resolution: B-axisdegree0.00000006


Flexible Options

  • Grinding Spindles
    • Asynchronous, Auto HSK50, 7.5KW
    • Synchronous, Auto HSK50, 15KW
    • Synchronous, Auto HSK50, 28KW
  • Robot Automation
    • Capable of autoloading 5 to 32 mm parts with one gripper assembly
    • Capacity for holding (4) pallets
  • Extended tool rail: 24-in. length (standard 17.3 in.)
  • On machine truing and dressing motor
  • CNC W-Axis for travel of tool support options along the Z-Axis
  • Manual and automatic tailstock designs
  • Hydraulic actuated steady rest support
  • Extended capabilities to hold and regrind gundrills up to 48 in.


  • Full library of available software to tackle the most demanding cutting tool designs
  • Free software version updates for the life of your NXT
  • USA based application support team for training and troubleshooting