As soon as we notice that the entire surface

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Separate lamellas are a bad sign and usually such a rotor does not help. If the collector surface is partially damaged, it must be leveled. Sewing machines have relatively small engines, and the collector can be processed on a regular drill, fixed on a special holder (see Figure), and without it, but it is much more difficult. With a given diameter, the collector was only partially greasy and dirty, there were no special dents. Old brushes can wear out the collector blades, and when installing new ones, their installation will not be good, so it is necessary to level the collector. For this we will need: a small fine file, protective crepe tape and a small sandpaper.

The windings around the collector and the ends are protected with crepe tape so as not to damage them. On longer rotors, fastening is required on both sides, in this case it is a shorter rotor, and this is not necessary. Turn on the drill, but reduce its speed to minimum using the regulator on the switch, start the drill and lightly remove the surface of the collector with israel telegram data a thin file, moving the file is the same as with standing objects, do not press hard without need. The surface will soon begin to level out. The depth of removal of the collector is quite variable, usually about 0.1 mm is enough, and on larger engines (electric starter 12 / 24V) it can be removed up to 0.5 mm or even more.


Usually on sewing machine motors it is usually up to 0.15 mm. is clean, we stop with the file and take fine sandpaper, say no. 500, maybe a little less, repeat a couple of times. The final polishing can be done with a piece of stronger felt or soft leather, we also clean the ends of the rotor shaft, but with the addition of a small amount of oil. In the case of cleaning the pins, the goal is not thinning, but only restoration of the bearing enamel.