MHPR-Power Corner Radius

What is the normal tool diameter and what is the best toughness? For flat bottomed milling cutters with a round nose blade diameter less than 2MM, a blade length of 1.5-2 times the blade diameter is optimal, a blade length of 4-6 mm is 2.5-3 times the blade diameter is optimal, and a blade length of more than 6mm is 3 times the blade diameter is optimal; For ball knives, it is best to have a blade length of 1-2 times the blade diameter for those less than 4mm, and 2.5 times the blade diameter for those greater than 5mm.