I like the concept for mill drill lathes. Generally the rotary tool spindle capability in terms of metal removal and HP is lower than the headstock and is a "finesis" and secondary transfer time eliminator and keeps al the true positions in one box. Using the brute force of the main spindle I feel would normally remove as much or certainly less than 500% more material. However, the reduced cutting pressure of the spinning tool on the radial load has a lot going for it to disapate heat and maybe the biggest advantage at times is the elimination to use a tailstock. Most multi-tasking turning centers lend themselves to sub-spindle configurations. Sure you can chuck a center in the sub , or use something in a secondary turret, but this is the best of both worlds as the sub can still be used for longer parts and the rpm of the part turning and rotating tool spining can probably obtain some outstanding finishes. Just dont try to do too many 0.010 max corner shoulders.

Very impressive. I work more with manual machining. I'm amazed @ the amount of speed & precision as well as the finish. Looks like the work time is shortened consierably...

Very interesting part. I like the eccentric bore turning. What software was used to program this part ?.