. Railway mechanical engineer . Hen lie * 3 Ale Two Boiler Shop Tools BY E. A. MILLER The gage, illustrated in Fig. 1, has proved a valuable toolfor indicating the wear of arch tubes in locomotive tubes often wear thin due to supporting the arch brickor the wearing action of rapidly moving gasses carrying solidparticles which have an abrasive action. The arch tubesare three inches in outside diameter and it is evident, there-fore, that a gage, constructed as shown in Fig. 1, when ap-plied to a new tube will bear on the tube at three k-f-l Fig. 1—Gage for Detecting Worn Ar
. Railway mechanical engineer . Hen lie * 3 Ale Two Boiler Shop Tools BY E. A. MILLER The gage, illustrated in Fig. 1, has proved a valuable toolfor indicating the wear of arch tubes in locomotive tubes often wear thin due to supporting the arch brickor the wearing action of rapidly moving gasses carrying solidparticles which have an abrasive action. The arch tubesare three inches in outside diameter and it is evident, there-fore, that a gage, constructed as shown in Fig. 1, when ap-plied to a new tube will bear on the tube at three k-f-l Fig. 1—Gage for Detecting Worn Arch Tubes The gage is made to the dimensions shown, being providedwith a movable pointed slider, graduated at the end to indi-cate relative positions. Should an arch tube be worn the gage when applied willnot bear on all three points and the point of the slider willextend beyond its normal position. Tightening the set screwwill then hold the slider in place and the amount of archtube wear will be indicated by the reading on thegraduations on the upper portion of the gage. Both gageand slider are made of 7/32 in. stock, the slider be-ing guided by a rectangular projection which setsin a corresponding slot in the gage. It is evident that if the arch tube is worn 1/16 in. at a certain point, ap-plication of the gage to this point will show a reading of1/16 in. on the gage. It is obvious that the gage would give a false impression ifused at a bend in the tube where the section is not circular,but experience at the shop where this gage is used indica
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
