. Electric railway journal . d the hotel and exhibit facilities necessary to ac-commodate those who would be in attendance at the conven- <tion. ; I \ After considering the facilities in Chicago the committeevisited Minneapolis, St. Louis and Rochester, N. Y. It willprepare a report upon the facilities of these cities for submis-sion to the American Electric Railway Association at an earlydate. AN AUTOMATIC COMMUTATOR GRINDER The Phillips Manufacturing Company, New York, is placingupon the American market an automatic commutator grinderwhich is widely used abroad for truing commutators in p
. Electric railway journal . d the hotel and exhibit facilities necessary to ac-commodate those who would be in attendance at the conven- <tion. ; I \ After considering the facilities in Chicago the committeevisited Minneapolis, St. Louis and Rochester, N. Y. It willprepare a report upon the facilities of these cities for submis-sion to the American Electric Railway Association at an earlydate. AN AUTOMATIC COMMUTATOR GRINDER The Phillips Manufacturing Company, New York, is placingupon the American market an automatic commutator grinderwhich is widely used abroad for truing commutators in posi-tion on generators, motor-generator sets, rotary converters,etc. The accompanying cut shows the device applied to a 1500-kw rotary converter in New York City. An important featureof this machine is its speed, because the grinding wheel can begeared to run as high as 2500 The grinding spindle isdirect-driven by means of a rubber-friction wheel which is runfrom the revolving commutator to obviate the necessity for a. Commutator Truing Device Applied to a 1500-kw Rotary- Converter separate motor. This spindle is carried by a strong slide andis absolutely rigid. The bearings are very long and the spindleand drum are balanced to permit high-speed running withoutvibration. In operating, the grinding spindle moves to and froacross the face of the commutator without breaking and tear-ing the mica or dragging the copper. The grinding mechanismis automatically reversed at each end. It can also be con-structed so that stops can be set for grinding the surface right 1 April i, igii.] ELECTRIC RAILWAY JOURNAL. 605 up to the connecting wires and back to the edge. Means areprovided for the refined adjustment of the friction and grind-ing wheels. It is asserted that this machine will restore thecommutator to a perfect curve and, furthermore, that it canbe set to remove a given flat spot without wearing off metalelsewhere. The device is particularly adapted for verticalmachines of al
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