I had planned a pipe bender a long time ago, until the moment came when I decided to build such a machine. There was a lot of work, especially in the process of creating wheels for bending and slides, I managed to make four pairs of wheels and slides for 22mm, 25mm, 28mm, 32mm pipes, but I'm in the process of working on the fifth wheel and slide set, for bending a 35mm pipe. I wanted the machine to have its own hydraulic power supply, so I decided to install a 1.1KW 1400rpm motor, combined the motor with a 6l / min / 4cm3 hydraulic pump. The maximum pressure of the set is 140bar, this pressure is sufficient to efficiently power a hydraulic cylinder with a piston rod diameter of 28mm and an extension of 350mm. The pipe bender easily bends pipes with a diameter of 32mm with thick walls, and the efficient bending of pipes with such parameters prompted me to build wheels and slides for thicker pipes. As for the protractor, I used a protractor, which is quite accurate in the school supply store :)