Most new rotors werent made to turn.Most are only .035 new to discard.You might be able to turn them but most will warp in a few thou miles.Contrary to most thoughts we have less problesm with the cheap rotors than the hi buck Wagner or brand names.Ive installed thousands and have had just about 0 problems with them.But if you want to spend $$$$ then go ahead.I probally do more brakes in a week than most here hhave done in 2 lifetimes.Rocky