A GRINDING TOOL FOR GRINDING BUTTONS OF A ROCK DRILL BIT, A GRINDING CUP, A GRINDING SPINDLE AND A METHOD FOR MOUNTING THE GRINDING CUP ON A GRINDING SPINDLE

摘要

The present invention relates to a grinding tool for grinding buttons of arock drill bit, a grinding cup, a grinding spindle and a method to mount thegrinding cup on a grinding spindle. The grinding tool (10) comprises arotatable grinding spindle (11), a grinding cup (15) having flush channels anda spring (14) holding them together. The grinding spindle (11) and thegrinding cup comprises co-operative recess (27) and projection (16) means. Thegrinding tool (10) has a working direction (R). One end (36) ot the spring(14) is substantially firmly connected in the axial direction to the grindingspindle (11). The spring is provided to allow rotation of the grinding cup(15) relative to the grinding spindle (11) only in the working direction (R)of the grinding tool (10). The grinding cup (15) comprises a wholly rotationsymmetrical, cylindrical surface (37) as the only means for driving.