. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . method nowin use was devised. The machine used is an ordinary carwheel boring machine, fitted with a Davismicrometer boring bar. The set up for boring the cylinder isshown in Fig. 1. In this iV represents abase plate which is held central on the table of the machine by means of thejaws O of the universal chuck. The cyl-inder is placed on tliis base and centeredby means of the plug Q which is boredout to slip over the boring bar R. Theconical surface is dropped into the cylin-der and by pressi
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . method nowin use was devised. The machine used is an ordinary carwheel boring machine, fitted with a Davismicrometer boring bar. The set up for boring the cylinder isshown in Fig. 1. In this iV represents abase plate which is held central on the table of the machine by means of thejaws O of the universal chuck. The cyl-inder is placed on tliis base and centeredby means of the plug Q which is boredout to slip over the boring bar R. Theconical surface is dropped into the cylin-der and by pressing do\vn on it with theroughing tool C, it is squared and thecylinder drawn to the center; it beingunderstood that the tools used in the bor-ing bar are squared on both sides, so thatas the lower one is pressed down on theplug Q the latter is moved so as to besquare with the bar. The plug thus cen-ters the cylinder with the bar, when it isclamped to the base plate with the strapsas shown. The plug is then removed andit is bored out to a standard diameter,the tools being set to micrometer measure-. DISC FOR FORMING FACE ON DRIVINGSLEDGES IN USE ON THE ERIE. ments in the boring bar. This makes itpossible to turn the bushings to a stand-ard diameter by a micrometer gauge soas to insure a uniformity of pressure inputting them in pla^e. They are made atrifle long so as to project beyond theend of the cylinder when in place asshown in Fig. 2. The cylinder is placedon the base as before and the plug re-versed and set over it. It will be noticedthat the upper side in Fig. 1, has a liparound the outer edge. This lip sets downover the end of the bushing and, whenthe boring bar is run through the hole inthe plug, the cylinder is centered. Whenthis is done the cylinder is again clampedto the base and the bushing bored andfaced off. It is a unique use for a wheelborer and one that has served to greatly 172 RAILWAY AND LOCOMOTIVE ENGINEERING June, 1921 decrease the time required for this cla
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