That is correct. And it is the reason I made this thread, to see if there was a supplier I overlooked.
I just picked a convenient spot on the spreadsheet to use as an example to illustrate the inertia effects. I made the graph to look at the whole speed range.
That's good to know.
I found nothing for 2516 ball screw when I searched both ebay and aliexpress. I did find a bunch of 2516 lead screws when I searched through a search engine.
The more expensive suppliers have pitches between 2510 and 2525, but that is outside of my budget. I did find a Chinese supplier that makes a ground 2016 ball screw. I don't know how much that costs, I need to find out. But with a ground ball screw (20mm OD), that would end machine way better for 15mm ID bearings than a rolled one would.