... One leveler grooving roller machine Duct manufacture auto-line 4 ( duct machine )Advantages:Line consists of feeding metal frame, leveler grooving ... maximum work speed is 10m/min. The length tolerance is ±0.5mm.The diagonal line tolerance is ±0.8mm. The lock ... sheet flange forming machine, TDF hydraulic folder, auto cutting to length line, pipe bending machine , FN seam welder,notching and shearing ...