Centreless grinding specially for taper rollers


Basic Data

The KRONOS K is the recommended solution for centerless grinding of taper rollers using throughfeed grinding. Based on the KRONOS M 400, an infeed screw adapted to the workpiece dimensions is used instead of the regulating wheel.

Machine description

  • Special grinding machine for taper rollers
  • Working range 4.5.... 35 mm, grinding wheel width of 400 mm
  • Thermally stable, vibration-damping GRANITAN® machine bed
  • Regulating wheel is replaced by infeed screw, which is aligned to the workpiece dimensions
  • High system rigidity as infeed screw and grinding spindle are supported on both sides
  • Modular dressing system

Possible technologies

  • External grinding in throughfeed grinding operations


Granitan® machine bed

The basis of the KRONOS K 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.

3-slide system

The 3-slide system of the KRONOS K comprises a swivel-type slide, an intermediate slide and an upper slide. The swivel-type slide forms the base for the guide system, on which the intermediate and upper slide are arranged compactly. This guarantees a high system rigidity 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 for the grinding wheel.

Grinding spindle

The grinding wheel width is a maximum of 300 mm with a bore diameter of 304.8 mm. The roller-bearing grinding spindle is designed for the use of conventional grinding wheels.

Regulating spindle

The regulating spindle is also portal-mounted with high precision pre-tensioned spindle bearings. A conveyor screw adapted to the dimensions of the workpiece is used in place of the regulating wheel side. The drive is provided by a digital servo motor and transmission.

Control system

The KRONOS K 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
Technical Data
kg / cm
lb / inches

Linear Axes

Max. Travel X 150 mm
Max. Travel Speed X 5.000 mm/min
Max. Travel Z 476 mm
Max. Travel Speed Z 5.000 mm/min

Spindle drive

Max. Spindle Power 37 kW
Max. Number Of Revolutions 3.008 /min
Max. Grinding Wheel Diameter 610 mm
Max. Grinding Wheel Width 300 mm

Swiveling Axes

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

Workpiece Data

Workpiece Diameter 5 - 35 mm
Center Height 1.100 mm

Linear Axes

Max. Travel X 5,906 inch
Max. Travel Speed X 196,850 inch/min
Max. Travel Z 18,740 inch
Max. Travel Speed Z 196,850 inch/min

Spindle drive

Max. Spindle Power 49,618 hp
Max. Number Of Revolutions 3.008 rpm
Max. Grinding Wheel Diameter 24,016 inch
Max. Grinding Wheel Width 15,748 inch

Swiveling Axes

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

Workpiece Data

Workpiece Diameter 0,197 - 1,378 inch
Center Height 43,307 inch
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Overview of the KRONOS series
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