Maximum performance for machining large workpieces


Basic Data

The KRONOS L 660 offers high performance for machining large workpieces. The centerless grinding machine combines cost-cutting production advantages with the highest grinding quality.

Machine description

  • Working range 5...250 mm, plunge length up to 655 mm
  • Thermally stable, vibration-damping GRANITAN® machine bed
  • Slide systems for grinding and regulating wheel side
  • CBN-capable up to 120 m/s
  • Hydrodynamic grinding and regulating spindles
  • Short set-up times thanks to modular dressing system
  • Designed for mass production
  • User-specific software for all centerless grinding requirements
  • Highest safety standard thanks to full enclosure

Possible technologies

  • Plunge grinding
  • Throughfeed grinding
  • Plunge grinding in mass production


Granitan® machine bed

The basis of the KRONOS L is the proven Granitan® machine base with excellent damping characteristics. High thermal stability ensures temporary temperature fluctuations are extensively compensated and a high capacity to hold the tolerance can be guaranteed throughout the day.

2-slide system

The workpiece support for the KRONOS L 660 is fixed in the center of the machine. All infeed and compensation movements are executed with the help of the grinding slide (X1-axis) and the regulating wheel slide (X4-axis). This enables easy automation of the machine.

Modular dressing system

Depending on the grinding task, stationary dressing tools such as diamond blades and single-point diamonds or rotating dressing tools such as diamond dressing discs or diamond profile rolls are available. The dressing times can be reduced to a minimum through the optional use of acoustic gap control for dressing detection.

Grinding spindle

The grinding wheel width is a maximum of 660 mm with a bore diameter of 304.8 mm. The grinding spindle is mounted on roller bearings and features with maintenance-free permanent grease lubrication. The use of hybrid bearings is optionally available to allow grinding with superabrasive cutting materials such as CBN or diamond. The grinding spindle is driven by a torsion bar free of lateral forces.

Regulating spindle

The regulating spindle is portal-mounted with high precision pre-tensioned spindle bearings. The regulating spindle allows for the use of 660 mm wide regulating wheels. The drive is provided by a digital servo motor and transmission. The adjustable regulating wheel inclination of +7°/-3° enables throughfeed grinding in both directions.

Control system

The KRONOS L comes with a SIEMENS SINUMERIK 840D sl control system as standard. MIKROSA has integrated a special operator interface for centerless grinding into the SIEMENS interface. The added symbols and icons are easy to understand and make programming even easier.

Hardware / Software
  • Maintenance and service friendly SIEMENS Sinumeric 840D sl control system
  • Heureeka - special MIKROSA softwarefor optimizing the grinding zone geometry
Technical Data
kg / cm
lb / inches

Linear Axes

Max. Travel X 310 mm
Max. Travel Speed X 5.000 mm/min
Max. Travel Z 755 mm
Max. Travel Speed Z 5.000 mm/min

Spindle drive

Max. Spindle Power 95 kW
Max. Number Of Revolutions 4.584 /min
Max. Grinding Wheel Diameter 660 mm
Max. Grinding Wheel Width 660 mm

Swiveling Axes

Swiveling Range A +3°/-6° °
Swiveling Range B +1°/-1° °
Swiveling Range C ∞ °

Workpiece Data

Workpiece Length 0 - 655 mm
Workpiece Diameter 5 - 250 mm
Max. Workpiece Weight 50 kg
Center Height 1.100 mm

Linear Axes

Max. Travel X 12,205 inch
Max. Travel Speed X 196,850 inch/min
Max. Travel Z 29,724 inch
Max. Travel Speed Z 196,850 inch/min

Spindle drive

Max. Spindle Power 127,397 hp
Max. Number Of Revolutions 4.584 rpm
Max. Grinding Wheel Diameter 25,984 inch
Max. Grinding Wheel Width 25,984 inch

Swiveling Axes

Swiveling Range A +3°/-6° deg
Swiveling Range B +1°/-1° deg
Swiveling Range C ∞ deg

Workpiece Data

Workpiece Length 0 - 25,787 inch
Workpiece Diameter 0,197 - 9,843 inch
Max. Workpiece Weight 110,231 lbs
Center Height 43,307 inch
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Product Brochure KRONOS L
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Overview of the KRONOS series
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