. Railway mechanical engineer . Rotai^ Surface Grinder EffectivelyUsed on Air Brake Parts A ROTARY surface grinder, with a work table consist-ing of a rotating magnetic chuck, the abrasive wheel ona horizontal spindle traversing back and forth acrossthe work, is sho^sTi in Fig. 1. This machine, made by theHeald ^lachine Company, \Aorcester, Mass., has been in-. exactly parallel. The accurate control of the amount of metalremoved by grinding also enables an unusually close fit in thepiston groove to be obtained. (As small an amount as .001in. of metal can be removed at a time.) Another advantag
. Railway mechanical engineer . Rotai^ Surface Grinder EffectivelyUsed on Air Brake Parts A ROTARY surface grinder, with a work table consist-ing of a rotating magnetic chuck, the abrasive wheel ona horizontal spindle traversing back and forth acrossthe work, is sho^sTi in Fig. 1. This machine, made by theHeald ^lachine Company, \Aorcester, Mass., has been in-. exactly parallel. The accurate control of the amount of metalremoved by grinding also enables an unusually close fit in thepiston groove to be obtained. (As small an amount as .001in. of metal can be removed at a time.) Another advantageof grinding the sides of piston rings is that the rings may becut off more rapidly from the packing pot when first beingmade, using a heavier feed. The grinder finishes these com-paratively rough sides smooth, whereas without the grinder,it would be necessary to use the smallest cutting-off feedavailable with a specially ground tool. Approximately SO per cent of the air compressor ringsused on the Michigan Central are made in the Jackson shopsand ground on the sides on this machine, as shown in The rings are made 1/32 in. heavier than standard andground to fit the piston grooves, about 1/64 in. being removedfrom each side. On an average about 20 rings of the larger Pig, 1—view of Heald Rotary Surface Grinder from OperatingSide of the Machine S
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
