ya u can turn em but u have to turn em on a aceuturn (speling) a old unit, and this is because they have a speed control as to wahre any of the new lathes are one speed. u have to cut them on the slowest setting. think about it guys (anyone who has used a lathe) the bit stays in the same place except for the duration of the turn. but it wont get caught in the groves. u need to just be carefull on how u set it up. ive done it almost everyday. i work in eastcobb so i get a lot of nice cars in there wit sloted rotors.. i u cant fine ur discard spec pm me i have a book on em all. ur gona have to have a mic to check what ur rotors are actualy at..