internal cylindrical grinding machine / for tubes / CNC / high-precision
MACRO SK Lapmaster Wolters GmbH



  • Type:

    internal cylindrical

  • Applications:

    for tubes

  • Control type:


  • Other characteristics:

    high-precision, creep feed

  • Power:

    6.5 kW (8.8 hp)

  • X travel:

    300 mm

  • Y travel:

    350 mm

  • Spindle speed:

    Max.: 16,000 rpm (100,531 rad.min-1)

    Min.: 0 rpm (0 rad.min-1)


The MACRO-SK from Peter Wolters is a grinding machine especially designed for machining the internal contours of stators, and it sets new standards in efficiency and precision for machining the internal diameter of stators. The machine concept of the MACRO-SK enables the user to grind various types of stators on the machine, e.g. Gerotor and Geroller. The machine has two spindle arms when fully equipped. During grinding, these spindle arms are lowered in a vertical direction into a stack of stators that are clamped in a fixture. The vertical grinding direction proves to be a major advantage in this regard compared to other machine concepts, because the cooling lubricant is channeled specifically into the grinding gap, thus achieving larger grinding feed values. The grinding time, and thus the entire cycle time of the process are reduced by having higher grinding feed rates. The maximum stack height in the fixture is approx. 100 mm, with the benefit that several stators can be ground at the same time, depending on the component thickness.