Hammer brush wear quickly how big spark
This should be the commutator surface wear caused by uneven, can remove the carbon brush, grinding on the commutator surface (the conditions can be a car, car bed knife) and the quality of carbon and carbon related without timely replacement. When replacing the carbon brush, proper grinding is required to ensure a good contact area.
An electric rotary hammer drill with a safety clutch with a pneumatic hammer mechanism. Hammer is the use of compressed gas piston, impact drill bit, need not make much effort, can open 6--100mm in concrete, brick, stone and other hard materials on the hole hammer in the above-mentioned materials on the opening of high efficiency, but it is not a hole in the metal
The commutator surface should be caused by uneven wear, can be removed by grinding of carbon brush, commutator surface.
