The invention relates to a process and machine for the production of rings of abrasive elements to a plate for the manufacture of rotating brushes. & br / the ring is made by forming several packets (33) of the abrasive elements to a plate, by bringing the packets (33) to a shaping station of the rings and by inserting the packets (33) to the inside of respective housings (74) of a ring (73) of housings located in the shaping station, the elements to the plate being locked relative to one another by means of an annular body retaining (76).
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