Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . figure 26. are probably the most important parts with which theengineer has to deal. Great care should be taken thatthe brushes set squarely on the commutator and thatthe surface of the brushes and commutator are assmooth as possible. It is a good plan, and in some ELECTRICITY EOR ENGINEERS 55 cases the brush-holders are so made, that the brushesset in a staggering position, that is to say, in a posi-tion so that all the brushes will not wear in the sameplace over the circumference of the commutat
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . figure 26. are probably the most important parts with which theengineer has to deal. Great care should be taken thatthe brushes set squarely on the commutator and thatthe surface of the brushes and commutator are assmooth as possible. It is a good plan, and in some ELECTRICITY EOR ENGINEERS 55 cases the brush-holders are so made, that the brushesset in a staggering position, that is to say, in a posi-tion so that all the brushes will not wear in the sameplace over the circumference of the commutator and. -^ZS FIGURE 27. cause uneven wear across the length of the commutatorbars. In most machines the armature bearing is leftso that there is more or less side motion, which, whenthe armature is running, causes a constant changing ofthe position of the brushes and commutator. 56 ELECTRICITY FOR ENGINEERS Whatever style of brush is used, the commutatorshould be kept clean and allowed to polish or glazeitself while running. No oil is necessary unless thebrushes cut, and then only at the point of cutting. Acloth (not cotton waste) slightly greased with vaselineand applied to the surface of the commutator while
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