@JHahn Tks for this Jannik. I’ll continue to do what sounds right and gives me acceptable results. However, you are correct. It’s good to know what the “science” says.
One thing you can likely clear up for me is, for example, if my calculated chip load is .003 and the recommended range is .017, is my chip load higher or lower than recommended? I know that this displays my ignorance loud and clear, but so bit it. Clearly, I know that the number .017 it larger than .003, but does this mean that my chip load is lower than recommended or higher?
As you demonstrate, one of the problems using chip load to determine our feeds and speeds is that the available charts vary wildly. Like you, I believe that most of them are calculated for machines much larger than our Mills. i work part time in a cabinet shop that has a Biesse 4 x 8’ CNC. It has pretty much nothing in common with our Mills. So, to say that ideal or recommended chip loads for the Biesse and the LM are similar seems to me to be nuts.
Finally, you mention that Fusion will do the calculation for you. I understand that the current versions of Vectric products will do that, too. I am using a version of VCarvePro that is 2 or 3 versions old. it does not have the feature and updating it is not in the cards.