The Locomotive . ue to a too heavy overhung flywheel or the influence of atightening device on the driving belt (Figs. 6 and 7) can be tracedin this way, and a suitable correction for these wrong conditions de-termined on so as toprolong the useful lifeof the shaft. The difiference in themicrometer measure-ments as found at twoopposite positions ofthe crank may be afew thousandths of aninch and sometimes is asmuch as several hun-dredths of an inch. Theextra bending stressesin the shaft material are of course proportional to this difiference. As an example, Fig. 8 is a graphical representation
The Locomotive . ue to a too heavy overhung flywheel or the influence of atightening device on the driving belt (Figs. 6 and 7) can be tracedin this way, and a suitable correction for these wrong conditions de-termined on so as toprolong the useful lifeof the shaft. The difiference in themicrometer measure-ments as found at twoopposite positions ofthe crank may be afew thousandths of aninch and sometimes is asmuch as several hun-dredths of an inch. Theextra bending stressesin the shaft material are of course proportional to this difiference. As an example, Fig. 8 is a graphical representation of conditionsfound in a 7-inch single-crank shaft. In this diagram the distancesbetween concentric circles represent two one-thousandths of an inchand the heavy circle denoted by zero is taken as a reference positions of the crank are denoted by Top, Back, Bottom andFront. The graph A was obtained by drawing a line through points a,b, c and d. If thefirst measurementbetween crank websis taken with the. Fig. 6. (Deflection Exaggerated for Purpose of Illustration.)
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Keywords: ., bookauthorhartfordsteamboilerin, bookcentury1800, bookdecade1860
