Any advice on how to manage/monitor and evaluate tool life effectively for a milling operation? We are milling the same part from the same material (cast iron) in the same heat treated condition with similar hardness . The cutting conditions remain the same with the exception of the width of cut. are mill are no older then 5 year old and some are new in 2007. I hope this is a better question. I'm looking to have some thing the operator can do a check off as they change tools.