. Railway mechanical engineer . Fig. 3—gi/a-ln. and Mj-n. Rings Ready for Grinding and from division points not equipped with grinding ma-chines. Many dies are received from the tool room for grind-ing. For example, a guide liner die just Ijeing developed atJackson is shown in Fig. 4. This is an effective labor-savingdevice since these liners are made standard and in quantitiesas against the old method of cutting them out one at a timewith a hammer and chisel and consequent loss of time. Thisguide liner die was ground on both sides in about 30 min.,1/64 in. of metal being removed from each sid
. Railway mechanical engineer . Fig. 3—gi/a-ln. and Mj-n. Rings Ready for Grinding and from division points not equipped with grinding ma-chines. Many dies are received from the tool room for grind-ing. For example, a guide liner die just Ijeing developed atJackson is shown in Fig. 4. This is an effective labor-savingdevice since these liners are made standard and in quantitiesas against the old method of cutting them out one at a timewith a hammer and chisel and consequent loss of time. Thisguide liner die was ground on both sides in about 30 min.,1/64 in. of metal being removed from each side. The die was. Fig. ^1—Close-Up of Packing Rings and Guide Liner Die. Ground onHeald Machine first ground dry and then finished wet. Fig. 4 shows a com-bination of the three most important types of jobs now doneon this rotary surface grinder. The machine has also been adapted for lapping-inrotary valves and valve seats as found in the commontj^pe of engineers brake valve. In this case, an auxiliar}lapping plate on which abrasive is applied, is held in an ec-centric position on the magnetic chuck table. One or morerotary valves, or valve seats are thereupon traversed back and forth across the lapping plate as it revolves, being looselyguided by means of a sheet metal plate provided with thenecessarj- holes and bolted to the grinding wheel head. Ithas been found necessary to do a little hand lapping afterthis operation, but most of the work is eliminated. Preheating Cast-iron Thermit Welds In order to compensate for the lower melting point ofcast-iron as compared with steel, the Metal & Thermit
Size: 1763px × 1417px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
