the result was a cnc-controlled broach grinding machine for diverse applications. no matter whether round, flat or helical tools, the corvus bba takes all in its stride. but what renders this machine truly universal is th......the result was a cnc-controlled broach grinding machine for diverse applications. no matter whether round, flat or helical tools, the corvus bba takes all in its stride. but what renders this machine truly universal is the fact that it can still grind all other cutting tools as well.