What kind machine called bends machining center.National industry standard definition:including cutting device,chamfering device and bending device. And bending device should have 3 axis movement as main axis rotation,chuck straight moving and chuck rotation, and cutting, chamfering and bending with CNC control.Bends Machining Center Terms and Definitions.Bends Machining Center.Have 3 axis movement as main axis rotation,chuck straight moving and chuck rotation, and cutting, chamfering and bending with CNC control.Pre-feeding.bending arm return to feeding position after bending pipe.Tooling offset.a distance between pipe and tooling to prevent friction or interference when feeding and changing tooling.Stack Height.Distcance of adjacent two stack's circular arc groove cente.Autoloading.Autoloading pipe into bending tooling by special device.Autounloading.Autounloading pipe from bending tooling by special device.Auto tooling Changer.Auto tooling Changer by machine.Safety Zone.Safety zone of moving parts area, moving parts in such safety zone by a safety speed.Above is Bends Machining Center Terms and Definitions.http://www.king-mazon.com/About_Company.aspx