. Electric railway review . bserve its beha-vior in everyday service, and the progressive manufactureris always glad to receive intelligent criticism from the manbehind the gun. Quality of commutator mica is one of the causes whichare very generally assigned for unsatisfactory results at thecommutator. Interesting evidence of this is found in answerto question Do you consider grooving mica below the sur-face of the commutator effective in improving commutation?Expressions from 33 roads, representing 13,810 cars, is asfollows: In favor of grooving roads, or per cent, of carsNot in
. Electric railway review . bserve its beha-vior in everyday service, and the progressive manufactureris always glad to receive intelligent criticism from the manbehind the gun. Quality of commutator mica is one of the causes whichare very generally assigned for unsatisfactory results at thecommutator. Interesting evidence of this is found in answerto question Do you consider grooving mica below the sur-face of the commutator effective in improving commutation?Expressions from 33 roads, representing 13,810 cars, is asfollows: In favor of grooving roads, or per cent, of carsNot in favor of 7 roads, or per cent, of carsNon-committal 3 roads, or per cent, of cars One reply to Question No. 8 is as follows: Yes, if usingsoft brushes of hard mica. Would do this more, if it wereeasier to do. Those who approve of grooving and are pre-vented by lack of convenient facilities, might look with favorupon a home-made device built, at small expense, along suchlines as are shown in Maintenance and Inspection of Electrical Equipment—Figure3—Commutator Grooving Device. The apparatus consists of a substantial oak armaturestand with V-blocks to take the end of the armature shaft,the V-block at the commutator end is adjustable verticallyby a screw attached to hand wheel shown beneath. TheV-block at the pinion end can be adjusted laterally as wellas vertically. At the commutator end is a shelf on which are twoslides carrying the boxes of a buzz saw shaft. The saw is October 15, 1907. ELECTRIC RAILWAY REVIEW 493 1% inches in diameter, .02 inch thick, and is driven at about1000 The saw is fed the length of the commutator bymeans of a hand lever, shown. On the opposite end of theshaft from, the saw is a fly-wheel. It takes about 5 minutesto set the work and 25 minutes to groove a railwayarmature of 117 segments, making a uniformly creditablejob of the grooving. The principle of grooving mica appearsto your committee to be co
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
