Thanks again to those who respond. I found some good formulas at stoptech.com, i'll have to verify them though.
Our lathes don't have brakes, but the technician said he could do better than 1mil for the parallel surfaces and same for the 5mil roundout. I looked into motorcycle rotors already...
Thanks for the responses.
I am now actually consider machining cast iron plates for rotors. After reading the sae.pdf and some other resources I think I'd like to use the gray cast iron (seems like most grades will work with little differences between them).
I will be modeling the rotors to...
I am looking for advice on material selection for machining brake rotors. For a small buget, i am looking into grey cast iron, or some steels. I've considered 1018 colded drawn, or 1080 steel (i believe its the same as on most motorcyles), I haven even a slight interest in 4130 as a past...