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DMG MORI Lathe spindle speed variation?


Apr 16, 2022
Hey there.
I’m working on DMG MORI Ecoturn 450 lathe, turning long 31” parts they are about 1” in diameter in one half and about 2” the other half. 316ss.
I was turning the similar ones but about 20” long, it wasn’t super easy to get a good finish because this thing wants to chatter all the time when it’s far from spindle.
I was wondering if anyone did use the “alternation spindle speed” or as haas called it spindle speed variation.
It’s MAPPS control, and I have no idea how if I can use this feature and how do I do that.
Any advice?
Or how would you machine this parts without steady rest with the tail stock?