Good eye! Yes, the spheres are balance features incorporated as a “balance by design” feature during simulation of the final design. These can also be used as a tool during the dynamic balancing of the tool after final assembly, as required. And finally, yes, organic structures such as this go through several design iterations to ensure the natural frequency of the resulting structure will avoid harmonics due to the forcing function during machining of the component.

Temperature variation will have an effect on dimensional stability. We are able to simulate changes based on the coefficient of thermal expansion but as you might expect it is challenging to predict for complex shapes. As with other precise finishing applications, best practice will be followed to control temperature variations with the cutting conditions.