. American engineer and railroad journal . .040 than the size required, and the wheel was then bored withboth sets of cutters in operation at one time. After this cutwas completed, the bar being raised, the finish cutters were setout to the required size and the second cut taken when theliiiish cutters only were cutting. As an illustration of accuracythat may be attained, wheels were called for bored to followingdiameters: , , , , , , , ,, inches. All the wheels were bored in the ordercalled for within a limit of .001 inch. No caliper
. American engineer and railroad journal . .040 than the size required, and the wheel was then bored withboth sets of cutters in operation at one time. After this cutwas completed, the bar being raised, the finish cutters were setout to the required size and the second cut taken when theliiiish cutters only were cutting. As an illustration of accuracythat may be attained, wheels were called for bored to followingdiameters: , , , , , , , ,, inches. All the wheels were bored in the ordercalled for within a limit of .001 inch. No caliper readings weretaken except to prove sizes after the wheels were removed fromthe mill. All changes in sizes were accomplished by turningthe index wheel to the size called for, and the boring was doneas fast as the cutting tools would permit. With a satisfactoryboring bar having an acurate micrometer adjustment for finishcutters, wheels can be bored to any size required to accuracyof .001 in., and as many wheels turned out as by any FIG. 4.— MICROMETER WHEEL BORE CALIPERS. On account of this accurate wheel boring, which is an accom-plished fact, it certainly is advisable to bore wheels to suit theaxles on account of less cost for labor, and only turning thesmallest possible amount from axles. A satisfactory manner of setting finish cutters is as follows:A trial cut to be taken and calipered with micrometer calipers;the index can then be set to size shown by micrometer 4 illustrates a special micrometer caliper that was de-signed by the writer for wheel bore. The principal novelty isin the extra anvil to insure the caliper being set square withcenter line of wheel. Figure 5 shows an application of tubularinside micrometer caliper for same purpose. By either of thesecaliper readings may readily be made and size chalked on thewheel in 30 seconds. The question of mating wheels to axles to obtain proper mount-ing pressure has always been and will continue to
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
