Abstract: A portable bending apparatus includes a frame, a major gear, a forming member, a workpiece guide and a gear mechanism. The major gear is mounted rotatably to the frame about a bending axis. The forming member is carried on a front side face of the major gear, the forming member having an arcuate forming surface and a restraint. The workpiece guide is mounted to the frame. The gear mechanism has an input connected to a geartrain connected to an output gear, the geartrain providing a speed reduction between the input and the output gear. The input is configured to receive rotary input from a handheld motorized driver, such as a portable drill. The output gear is enmesh with gear teeth of the major gear.