. Railway mechanical engineer . ensive tables showing the test details are includedat this point; also, a discussion of brand and group com-parison, and a table showing average energy consumption. Character of (^hips Produced and Failure of the Tools From a long ribbon of steel progressive decrease inlengtli of chips is undoubtedly, largely caused b)- a gradualchange in the most effective portion of the top surface of thetool resulting from abrasive action of the metal being cut. Agroove or gutter is worn near the nose and forces tlie chipto curl more and more sharply as the wear increases and
. Railway mechanical engineer . ensive tables showing the test details are includedat this point; also, a discussion of brand and group com-parison, and a table showing average energy consumption. Character of (^hips Produced and Failure of the Tools From a long ribbon of steel progressive decrease inlengtli of chips is undoubtedly, largely caused b)- a gradualchange in the most effective portion of the top surface of thetool resulting from abrasive action of the metal being cut. Agroove or gutter is worn near the nose and forces tlie chipto curl more and more sharply as the wear increases and be-cause the chip is highly stressed tlie ribbon breaks into smallsections instead of passing freely over the t(K)l at approx-imately its original top angles. The wear on the enteringside near the nose is also an imjwrtant contributing factorparticularly near the end of tlie cut and both effects areshown in Fig. 2. Breakdown is concomitant with the production of a glazeon the test log showTi in Fig. 3. At the moment of failure. Fit|. .— Tool Just Aftir ; I lliisti-ation Shows GlazeProduced On the Test Log which generally incurs suddenly, tlie diincnsions of tiic rhij)(](■( rcas thenose, shown in Iig. -t, thus giving (oncrcte (|u:ilitiitiveevidence of the high pressure and lem|)eraliire at tiiemoment. iest Series 4 showed tlinl llir rcliitivilv poor ciiijnrjnce of 6S0 RAILWAY MECHANICAL ENGIXEER Vol. 96, No. 11 the high-tungsten, lo\v-vun;idium steels in the severe tests isnot obsen-ed under more moderate test conditions. TestSeries 5 showed that when small tool tests are carefully car-ried out, the results are a measu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
