a61nx is a machine equipped with a 302 Nm 14,000 rpm spindle. This monster spindle can assure an extremely high material removal rate. But a system is as weak as the weakest component.
If the high cutting forces are generating low frecuency vibration from the fixture, the highest torque can be misused and affect negatively to the tool life. Using dedicated fixture with dampening elements or a mineral tombstone such as the TripoxyMineral is a simple way to increase the dampening of the assembly and increase tool life.
The mineral they use on the tombstone is able, by its own nature, to reduce the vibrations and at the same time increase the rigidty.