.015 in 6" is a well within the range a tool room lathe can twist.
?? I submit you meant: "trade-school training / hobby / general repairs economy-grade
light lathe". Even then, 0.015" seems too much for a mere 6".
I'll refrain from saying "spaghetti bed" or "cursed with Iron deficiency anemia", but Gustafson having mentioned his
own mount is a 10EE?
By comparison he may be laughing his ass off about now?
If a "toolroom" or "tool & gage" lathe were to be defined more or less in alphabetical order, as an appropriately optioned and selective-fitted example of:
ATW Pacemaker, Axelson T&G, Hendey T&G, LeBlond Heavy-Duty with the 25-millionths TIR Timkens, L&S Powerturn / AVS, Monarch 10EE, Nebel Microturn, Rivett 10XXS, just to cover US Made marques?
"No Fine Way" yer twisting a bed by enuf to deliver 0.015" taper in six inches.
Some of those have kinematic 3-point suspension. Most have massive "base" castings, fully integrated, stress-wise. Some have carriages as mass as much as the entire Logan does, and "long" enough they'd smooth-out a twisted bed even if one COULD twist their heavy beds + serious support structure, integrated or otherwise.
Just not happening.
The portion of
Texas under the "legs" would bend first!
And that ain't EASY! Texas ain't as "vague" as the Kalifornikyah SSR.