. American engineer and railroad journal . be overestimated; in fact, no lathe centerin an_\ shop should receive more attention, for the reason thataxles during their life may be turned several times on differentlathes, and, if the angle of centers is not uniform, the centerin axle will be badly and unevenly worn and make it difficultto do good turning. A case came to hand where a few axleswere turned some .010 inch out of round. Investigation showedthat the lathe on which they were turned had centers of about85 degrees angle, and that the axles were centered 60 a result, the axle o
. American engineer and railroad journal . be overestimated; in fact, no lathe centerin an_\ shop should receive more attention, for the reason thataxles during their life may be turned several times on differentlathes, and, if the angle of centers is not uniform, the centerin axle will be badly and unevenly worn and make it difficultto do good turning. A case came to hand where a few axleswere turned some .010 inch out of round. Investigation showedthat the lathe on which they were turned had centers of about85 degrees angle, and that the axles were centered 60 a result, the axle only bore on the lathe center at end orhad a line bearing. This line bearing soon wore unevenly,allowing the axle to work back and forth, and this was re-sponsible for the eccentricity of the axle. Several of the modern axle lathes have only dead centerswhere grinding in place is not possible. Also in many casesthey are too large for the average tool room grinder, and as aresult the centers are not given the neces>;ary aitentinii, Rec-. * Genl .Shop Inspector, Pennsylvania R. R. Flei. I.—L.^THL CENTER CRINDIXG ognizing the fact that where ready means are provided forgrinding centers they will be kept in better order, the grindingmachine. Figure i, was designed. This machine will only grindto 60 degrees included angle, being made this way purposely toprevent possibility of being set wrong. It is not expensive,and would be a desirable addition to any shop. While savingscannot be put down in dollars, there is no question but thatthe resultant lietter work will justify its use. Cenur gaugesare cheap, and should be frequently tried on centers, and in 215 216 AMERICAN ENCtINEER AND RAILROAD lOURNAL June, 1911. event of the latter not being to proper shape or rough, the)should be repaired at once. Another point out was the necessity of havinglathes in proper alignmert to insure turning a journal or wheelseat same diameter for its entire length. The importance of
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