Peter Wolters Micron Macro-S tool creep feed grinder slashes cycle times

Gerotors are used widely today throughout the industry, and are produced in a variety of shapes and sizes by a number of different methods. In gerotor manufacturing, the most economical way to achieve the tight tolerances and surface quality of the outer contour of the finished rotor is to use creep-feed-grinding. The Micron business unit of Peter Wolters has now successfully completed its first acceptance of a Macro-S for CBN rotor grinding. CBN creep-feed-grinding requires an extremely sturdy and rigid machine, as the normal forces are much higher than when grinding with conventional wheels. The Macro-S design, with its concrete-filled base, guarantees an extremely torsion-resistant machine bed, despite its small 1.5 m width. A significant factor contributing to successful process control is the accurate positioning of the work piece, allowing for precision grinding of the outer contour of the rotors. The Macro-S uses a high-precision index table from a European manufacturer. This table, in combination with a high resolution angular measurement system, is able to position the rotor with an accuracy of under 0.5 µ.