Mounts the pump directly to the Hopper instead of using a hosepipe. The suction hose is always larger than the Pressure Line. A small suction Line can also cause Cavitation in the Pump rotating at 3450 rpm. I've been working with pumps for 40 years. Cavitation destroys the Impeller or Gears in the Pump. You are pumping Air and Partial Solids, not All Solids. The Tank capacity should be three times the Cylinder Capacity (i.e. if the cylinder has a volume of 10 ounces, the volume of the Tank should be 30 ounces). If you bend too many pipes, the oil will get hot. You need to consider cooling the oil from the cylinder to a cooler and then to the Tank. To cool the oil you need a Fan and a set of Aluminum pipes with fins. Cooling the oil stops Cavitation (Air Bubbles in Oil in the Pump).I had planned a pipe bender a long time ago, until the moment I decided to build such a machine. There was a lot of work especially in the process of bending and creating the wheels for the slide, I managed to make four pairs of wheels and slides for the 22mm, 25mm, 28mm, 32mm pipes but I am in the process of working on it. Fifth wheel and slide set for bending a 35mm pipe. I wanted the machine to have its own hydraulic power source, so I decided to build a 1.1KW 1400rpm motor by combining the engine with a 6l/min/4cm3 hydraulic pump. The maximum pressure of the set is 140 bar, which is sufficient to efficiently power a hydraulic cylinder with a piston rod diameter of 28 mm and an extension of 350 mm. The pipe bender easily bends thick-walled 32 mm diameter pipes, and the efficient bending of pipes with such parameters prompted me to make wheels and slides for thicker pipes. As for the protractor, I used a protractor at the school supply store which was pretty accurate.