Hi
Certain CNC benders have hydraulic cut off devices buildt in; it bends and cuts the pipe consistently if none of the other parameters vary, i.e. tube material, batch of tubes, temperature, machine process, operator etc.
Anybody can bend pipes but if tolerances are paramount, a proper SPC is crucial to obtain repeatability.
Generally a seamless process, design to manufacture, produce a more consistent result.
rgs
Ax