Hi ,i would like to buy used kuka robot arm that will be used for milling granite and marble stone ,like kitchen countertops ,and have a few questions if you can help please . is kuka kr210 good enough with krc2 controller ED05 ? what kind of spindle motor will be ok ?is krc4 so much better ?is atc 9kw enough for milling and is powermill cam software enough by itself ,thank you very much !!