I've been trying to find some good examples of how does the constant surface speed control work - in numbers (S,F). Couldn't find anything that would be satisfactory.
I've taken some figures from a SECO catalog and applied the G50 code for lathes. I imagined i have to work a piece from a D1=120 mm to a D2=60mm.
In the catalog the Vc=630m/min for a mild steel. The S1 is apx.1340 Rpm and the S2 is apx. 3340 Rpm (for the 60 mm). The Ap=1 to 5 mm. Now, I 'm not certain, but, if the max. Speed, S2, is 3340 Rpm then the Speed I put on the line of G50 is higher?