. Railway mechanical engineer . y on the milling eccentric rods, radius rods and lap and lead levers areall milled on a slab miller, as many being milled at atime as the table of the machine will accommodate. Theradius rod links and the lap and lead rod links are milled onthe edges and flats on a smaller machine. The ends of allthe rods are milled on a vertical miller and the jaws in theeccentric rod, radius rod and the links are milled in the same machine. The long jaw in the radius rod is alsomilled, the work previously being done on a slotter. The valve gear motion work is prov
. Railway mechanical engineer . y on the milling eccentric rods, radius rods and lap and lead levers areall milled on a slab miller, as many being milled at atime as the table of the machine will accommodate. Theradius rod links and the lap and lead rod links are milled onthe edges and flats on a smaller machine. The ends of allthe rods are milled on a vertical miller and the jaws in theeccentric rod, radius rod and the links are milled in the same machine. The long jaw in the radius rod is alsomilled, the work previously being done on a slotter. The valve gear motion work is provided with casehardenedIjushings at every pin. These are ground to size after hard-ening, on the Heald grinder, .002 in. being the allowablevariation from the dimension. This machine hasproved very valuable for this class of work. It has a widerange of usefulness and at these shops it is used for grind-ing out the interior of knuckle pin bushing after being ap-]ilied to the side rods (see Fig. 5), the pin hole in the link. Fig. 7—Slab Mitier for Machining Rods guide block, the hole in the link and lift shaft bracket (seeFig. 6) and all other interior grinding that is necessary. M.\IN .AND SIDE RODS Both the slab and vertical milling machines are used to;i large extent on the main and side rods. Fig. 7 shows aLToup of side rods on one of the slab milling machines, having just been milled. Eight rods are milled at a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
