That creates a lot of problems. Hardness is not a difinive factor. Besides I don't really know how to apply hardness nuber to anything really. There is no hard and fast formula around for that. If you got suggestions I am listening....

well lets say im machining a2 only ive had it heat treated to 40-45rc (sorry i use c scale)...i was thinking you would have a box next to the material selection in your calc, that you can toggle on and off and then you could apply a number range to your material selection. maybe thats asking too much...im not sure of the formalities of computer programming, nor do i know the formulas you use to achieve everything you have thus far. just an idea i had.

40-45rc is just an example...but sometimes i machine a2 at 60rc, and i was thinking to try cutting into these pins we made from drill blank this week, which is i understand correctly is m1 @70-75 rc...

There is already H13 steels for that. Look for it. It says H13 40-45 RC and so on. It comes up to 50-55 rc if I remember correctly. I promise to update material list with more hard steels next time. In the future you will have ability to define your own materials.

Sounds good, thank you