There are plenty of materials on my end. You just have to click one of the other buttons near the material dropdown and it opens a full list.
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But yeah I'll agree, I've had better success with the HSMadvisor numbers, especially with small tools and in tougher to machine materials.
I have both, it's interesting to compare numbers and see if they agree or disagree, and how they match up with manufacturer recommendations as well.
In the end I don't consider any calculator to be the final word, but rather guidelines and starting points that you still have to apply some common sense and experience to.