I'm trying to build a simple Van De Graaff generator, for the first time. The problem is quite obvious - the current generated is zero. Can somebody help to find what is wrong? The column is a typical sewer pipe, axles are aluminum bars, electric screwdriver acts for motor. The upper roller is glass textolite in free-spin on aluminum bar, the belt is doorframe rubber band. The materials seems to fit the purpose - when the roller was rubbed against the belt, it got enough charge to lift some pieces of paper. The lower roller is a duct tape construct fixed on an aluminum bar the screwdriver is connected to. Brush wires are typical copper wires, the sphere is a party balloon rolled in a layer of aluminum foil and a layer of duct tape, also tried a dried pepsi can and two pots. The weather is bad, but the attempts are made in an air-conditioned room. There are neither sparks, nor current indication on an ampermeter, with or without the sphere. The pictures of the thing: Overview: http://orbides.1gb.ru/orbf/vdgdbg_1.jpg Upper brush: http://orbides.1gb.ru/orbf/vdgdbg_2.jpg http://orbides.1gb.ru/orbf/vdgdbg_3.jpg http://orbides.1gb.ru/orbf/vdgdbg_4.jpg Lower brush: http://orbides.1gb.ru/orbf/vdgdbg_5.jpg Any advice where to look for problems, or is anything obviously wrong?