. Railway mechanical engineer . and are adapted to grind either steel or chilled cast iron wheels. Driven by a 35-hp. constant speed motor, tiie machine has amjilc power to remove metal quickh. and the production is materialh increased ijy a i)i;mp and water tank arrangement, furnishing 40 gallons of water per minute on rinding wheel. Chilled Cast Iron Wheels The number of chilled cast ironcar wheels reclaimed by grindingat any one point varies greatlyfrom time to time and with theseason of the \ear. For example,it has been noticed that muchmore slipping, with resultant flatspots, occurs durin
. Railway mechanical engineer . and are adapted to grind either steel or chilled cast iron wheels. Driven by a 35-hp. constant speed motor, tiie machine has amjilc power to remove metal quickh. and the production is materialh increased ijy a i)i;mp and water tank arrangement, furnishing 40 gallons of water per minute on rinding wheel. Chilled Cast Iron Wheels The number of chilled cast ironcar wheels reclaimed by grindingat any one point varies greatlyfrom time to time and with theseason of the \ear. For example,it has been noticed that muchmore slipping, with resultant flatspots, occurs during the wintermonths than during any other timeof the year. The number of flatspots developed during the springand summer months, however, islarge. In March of the presentvear. 1,200 cast iron wheels were sent to the scrap dock of the eastern railroad previouslyreferred to. and 10 per cent of these were reclaimed In-grinding. It is felt that many shops not now equipped withcar wheel grinding machines are unable to take advantage. Fig. 3—Machine Developed for Grinding Mounted Car Wheels and the grinding time varied from about 14 to 50 minutes,depending upon the condition of the wheel tread and thelength of the flat spot. As indicated, the average total timereciuired to criiul each of 22 ]iairs of wheels was 38 minutes. Tune. 1920 RAILWAY MECIIAXICAL ENGINEER 357 The saving effected, as shown in Taljle II, was computedby obtaining the difference between what it would cost toapply a new wheel and the cost of grinding Hat spots out oftlie old one. It is obvious that the cost, in the case of a newwheel with a newly developed flat spot, includes the differ-ence between its new and scrap value, plus the cost of re-moving, boring and applying the new wheel. This totalfigure is as indicated. Most manufacturers offer a Table n--SAV[XG Effected by ( Flat Spots Out of ChillldCast I box Car Wheels Cost of applying new wheel: M. C. B. differential nn oJincli wheel $ Charg
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
