Stone mounting system

摘要

A comminuting apparatus for reducing the size of particles, having a frame (20) providing an aperture (22) with an internal perimeter and has an approximately circular shape. A stone (50) has a grinding surface for grinding a material and provides a perimeter having a shape corresponding to the shape of the aperture of the frame and configured to be at least partially surrounded by the frame. When the frame (20) is rotated the perimeter of the aperture of the frame is configured to coact with the perimeter of the stone (50) such that the stone is rotated at substantially the same speed as the frame. <IMAGE>