I had made a few suggestions how this can be done in this post:
http://cnczone.com/showthread.php?<b...id=203#post739
I have used the Machinery Handbook 19th edition for many years. But I keep most of my calculations as simple as I can get away with. And to make it even simpler I had written for myself BASIC programs to do these calculations.
The 25th and 26th editions have information on also how to estimate feeds and speeds for tool life. Which I have found of interest. But have not at this time worked out a simpler way to do those calculations. So I haven't yet bothered.
Basicly the SFPM dictates tool life for the most part. As a rule of thumb so to speak, I suppose the 80% rule double the tool life.
Currently most feed and speed programs that I have seen ingnore tool length. My personal programs do not. Shorter tools can run faster than longer tools. And CAM package calcuations also ingnore changes in width and depth of cut in the calculations as well as horse power needed at the spindle for a given RPM.
So I am not real fond of the ISO9000 CAM requirements. Fortunately for me I am not under such restrictions when it comes to estmating feeds and speeds.