Thanks for the insight, arskiracer and Big Jim. It helps to read posts from people who actually have them on their car and/or have had more knowledge or experience at machining them.
I have heard from different people about the circular diamond blade that is incorporated on the newer lathes. I would make the assumption that its circular shape would glide over the holes making turning these rotors possible, but I have yet to see one of these machines in action before I can judge for sure. Even more helpful would be to actually see it turn a cross drilled rotor. I just know that a lot of these smaller shops (especially where I am from) still use the older style machines and the owners see no need to convert. When I was first learning the lathe, I turned a regular rotor and hit a small imperfection. Instead of bypass it, the tip caught it locking up the lathe. That's why I assume that a cross drilled rotor would not work on a lathe with the triangular tips. But I would like to see the ones that incorporate the circular diamond blade in action.
