Why 1:- While running time insert broken.|Why 2:- Since the material(S130) is hard material we used to change the insert once in every 5 Parts. But this time the cutting edge of the insert got broken for the second part itself then the cutting edge was changed and this time the insert broken for the first part and the thickness got undersized.|Why 3:- Shim used to align the insert was found broken from the bottom face when the entire assembly of the insert was removed and inspected and this crack not visible from the top face during the insert change and because of which the insert got broken for the second time.