That is a starting point; try it and see how it performs likely you can run it faster; it is better so start low and increase than start high and wipe out the inserts. Perhaps my off the cuff recommendation was low, I've consulted my B&S cutting speed calculator for 100 BHN steel (soft), and they , which would be say to start at 450 FPM which would be 630 RPM; my mistake! For HSS, the FPM would be 150, the RPM would be 230.