Ok well any smaller dia than 143.28mm then with a surface speed of 2250 m/min he would be over his max spindle speed, for example at 100mm dia rpm would be 7,163, at 50mm dia it would be 14,237rpm, 20mm it would be 35,817rpm.
So what is the error message or how does it error out.
As said though I think its because of the huge surface speed being called, 250m/min would be more like it.
Hood