High Quality Content by WIKIPEDIA articles! A pipe and tube bender is a machine which bends tube, pipe and solid metals. Pipe bending machines are typically human powered, pneumatic powered, hydraulic assisted, hydraulic motor driven, or electric servo motor. In the pipe bending operation the tube may be supported internally or externally to preserve the cross section of the pipe. In operations where there is flexibility in the shape of the pipe, the pipe does not need to be supported, however there will be some deformation in the cross section of the pipe.Tube bending as a process starts with loading a tube into a pipe bender and clamping it into place between two dies, the clamping block and the forming die.