I think honestly you are looking at things maybe as a theoretical issue rather than practical.
I maybe use the top four speed range of my lathe maybe one or twice a year. Normally I have no problems getting a finish using my lower four direct gears, the highest is 685 rpm.
I don't know whether this is due to experience or what, but I have never run into any finish problems at all. But that is only my views, someone else may have different thoughts. |