. American engineer . machine, varies from two to threeminutes. After the ends have been filed off to fit, they areready for the outside and inside turning. When the rings are closed after tlie kerf has been cut, theywill assmne an oval form, which must be entirely done awaywith, if it is desired to avoid the excessive leakages that aresure to occur where the rings do not fit closely against thecircular walls of the bushings. On the other hand, we haveseen that, in order to be perfectly free in its place, a valve ringshould always be thinner at the bottom, that is at the ends,tlian the depth o
. American engineer . machine, varies from two to threeminutes. After the ends have been filed off to fit, they areready for the outside and inside turning. When the rings are closed after tlie kerf has been cut, theywill assmne an oval form, which must be entirely done awaywith, if it is desired to avoid the excessive leakages that aresure to occur where the rings do not fit closely against thecircular walls of the bushings. On the other hand, we haveseen that, in order to be perfectly free in its place, a valve ringshould always be thinner at the bottom, that is at the ends,tlian the depth of the groove measured on a radial line. Atthe same time, the thickness at the top should be appreciablygreater, in order that it may take up, as far as possible, thegreater space resulting from the eccentric position of thevalve, which is constantly carried on the bottom of the bush-ings, as is shown in Fig. 1, if leakage through the split in therings is to be avoided. The width of the opening in the rings, ^ftKeP/ate. Fig. 8—Cutting Piece Out of the Paci<ing Ring. when in place, is about .02 in. at the smallest diameter, butincreases with the wear of the rings and the bushing. The rough turned rings are drawn together by flexible straps,as shown in Fig. 9. Between the ends of each ring a slieet of metal, about .02in. thick, is placed to correspond to the normal distance be-tween them when in place. The rings thus clasped are mountedon a special fltting, as shown in Fig. 10, which consists of twoplates of the same diameter, of which No. 1 is screwed to thelathe spindle, while the other. No. 2, is mounted on the firstby means of four studs. The holes for these studs in plateNo. 1 are slightly elongated to permit of a displacement cor- i R}ng
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
