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 a rock drill bit, a grinding cup, a grinding spindle and a method to mount the grinding cup on a grinding spindle. The grinding tool (10) comprises a rotatable grinding spindle (11), a grinding cup (15) having flush channels and a spring (14) holding them together. The grinding spindle (11) and the grinding cup comprises co-operative recess (27) and projection (16) means. The grinding tool (10) has a working direction (R). One end (36) ot the spring (14) is substantially firmly connected in the axial direction to the grinding spindle (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 rotation symmetrical, cylindrical surface (37) as the only means for driving.