. Railway mechanical engineer . to the ease with which ringscan be released from, or secured to, the magnetic chuck. Thering is sim|)iy placed in the desired position, l)eing held tliereby the magnetic chuck as sfxm as tlie switch is thrown. Re-versal of the switch releases flic ring. .Another job of a similar tyjx; done on this machine con-sists of grinding the sides of the smaller main valve rings 645 646 RAILWAY MECHANICAL EXGIXEER Vol. 96, No. 11 in the top heads of air compressors. Twent)--five of theserings can be placed on the magnetic chuck, at the same time,being finished accurately,
. Railway mechanical engineer . to the ease with which ringscan be released from, or secured to, the magnetic chuck. Thering is sim|)iy placed in the desired position, l)eing held tliereby the magnetic chuck as sfxm as tlie switch is thrown. Re-versal of the switch releases flic ring. .Another job of a similar tyjx; done on this machine con-sists of grinding the sides of the smaller main valve rings 645 646 RAILWAY MECHANICAL EXGIXEER Vol. 96, No. 11 in the top heads of air compressors. Twent)--five of theserings can be placed on the magnetic chuck, at the same time,being finished accurately, rapidly and smoothly. For thereasons mentioned the grinder is better adapted to performtliis operation than any other tool, and the accuracy of finishin this particular case is extremely important since the com-pressor will not reverse properly unless these rings are anaccurate fit in the main valve piston grooves. In addition to this work, many surface grinding jobs arebrought to this machine from other departments of the shop. 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
