hello, i am not so much into building machines, but maybe this helps : https://www.makino.com/resources/con...ing-moment/392

so far i did not had time to apply & check what that video suggests, but, in short, it seems that BT cones are the most rigid for the "teoretical heavy specs", while other types are more rigid for the real, most common " cutting specs ", but, above this range, they start to deflect pretty fast; in other words, use the machine in a 'normal' manner, regardless of what shank type is there / kindly