http://www.averexcnc.com/en/HS-540ki_GTS/MainFeatures.html High Power, Precision, Rigidity, Capacity, Expandability 15K STD Ceramic Ball Bearing, Big Plus BBT, 30 Bar CTS 20K OPT spindle 1.2 sec ATC Automatic Tool Changer, 46 Tools expandable 60/80 5 sec APC Automatic Pallet Changer, 1212 lbs payload per pallet 400 / 500 mm pallets simultaneous 2 Pallets STD / 6 Pallets Opt 0.001 degree 4th Rotary Table B Axis, high speed 66.6 RPM X Y Z Axial Tsubaki Ballscrews & THK Roller Guideway