Don't have an 1100, but have a 2hp spindle. I just purchased a 4 flute 2.5"x,45 degree face mill from Shars and run .025 doc x 2.25,3500 rpm at 100 IPM. Spindle load is around 50%. Leaves lines during roughing, but followed up with a finish cut at 15 IPM leaves a nice finish. That's in 6061.