. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ears and makefrequent repairs necessary to insure satis-factory work. The importance of alathe in proper alignment can be ap-preciated when we consider that to mounta steel wheel having 7-in. hole or castiron wheel of the same size, the axleshould be .007 and .015 ins. approximatelylarger than the wheel bore and also of an inch variation will affect the July, 1911 RAILWAY AND VJ01 l\ E ENGIN1 309 mounting pressure some 10 per cent. Ifthe wheel seat be turned taper it is notpossible i
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ears and makefrequent repairs necessary to insure satis-factory work. The importance of alathe in proper alignment can be ap-preciated when we consider that to mounta steel wheel having 7-in. hole or castiron wheel of the same size, the axleshould be .007 and .015 ins. approximatelylarger than the wheel bore and also of an inch variation will affect the July, 1911 RAILWAY AND VJ01 l\ E ENGIN1 309 mounting pressure some 10 per cent. Ifthe wheel seat be turned taper it is notpossible in properly caliper except theaverage diameter which will rarely be atrue indication oi mounting pre isun [ii in ih <] tapci, an extra strain mai erted on one part of the wheel with thepossibility of no pressure on other parts. i alipi i on ai i ount ol being too ilow andthen i ing too much personal 11< mi nl in,i , d. Without question, mi< romi ti. are the more jal isfaicalipering axles such as an], ,1 in repaii hops. At fitthis maj appi ai a n fim mi nl but ihas proved their value. MICROMETER AXLE C \l [PERS. Actual eases ha\c come up where wheels have been removed that only had bearing for part of their length owing to taper-turned axles, and while the wheels didnot come loose in service it is a conditionwhich, if known to exist, would be badfor ones peace of mind. A very satisfactory test for lathe align-ment is to lake two or three light cutsfor the entire length of wheel seat andmeasure the diameter with wheel seats there should never be adifference in diameter exceeding .002 every case after repairing lathes tothis standard the results have been somuch better that the method cannot be toostrongly recommended. Tests made to determine the speed thataxle lathes should be run at, developedtin- fact that 45 was about the limitfor car axles. The limit being the chat-tering of axle rather than cutting tool. The question of low speed a
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