... making the coil straight for the different width. Servo-motor drive ,feeding for step by step, and the tolerance ... the sheet after punching and cutting to roll forming machine,motor driverStructure:The frame is welding by H-beam, ... the roller material is coated Cr(Zn),motor driverData:Thickness of coil :2.0-3.0m, ... auto or manual 3.9.1 M/C controllingThe motor speed of M/C is adjusted by transducer; ...