Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . figure 43. assuming the length of the short bar to be one-half thelength of the stroke, proceed as follows: Place the engine on the center with the crosshead atthe end of the stroke towards the crank. Then havingpreviously bored a hole for the pivot in one end of thependulum bar and in the other end a hole for connect-ing with the link, suspend the pendulum by a tem-porary pin, as a large wood screw, directly above and in 178 ENGINEERING line with the stud or bolt hole which has previouslybeen tap
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . figure 43. assuming the length of the short bar to be one-half thelength of the stroke, proceed as follows: Place the engine on the center with the crosshead atthe end of the stroke towards the crank. Then havingpreviously bored a hole for the pivot in one end of thependulum bar and in the other end a hole for connect-ing with the link, suspend the pendulum by a tem-porary pin, as a large wood screw, directly above and in 178 ENGINEERING line with the stud or bolt hole which has previouslybeen tapped into the crosshead at any convenientpoint. The pendulum should be temporarily sus-pended at such a height that when it hangs perpendic-ular the hole in its lower end will line up accuratelywith the hole or stud in the crosshead. Now swingthe pendulum in either direction a distance equal tothe length of the link (one-half the stroke of the. FIGURE 44. engine) from the crosshead connection and note thedistance that the bottom hole is above a straight edgelaid horizontal and in line with the center of the studin the crosshead. This will give the total vibration of thefree end of the link from a line parallel with the lineof the engine and the permanent location of the pivotshould be one-half of this distance below the tem-porary point of suspension. This will allow the link THE INDICATOR 179 to vibrate equally above and below the center of itsconnection with the crosshead. Fig. 47 shows a com-plete connection of this character. Sometimes the end is slotted and thus directly con-nected to the stud in the crosshead, dispensing withthe link. In this case it is necessary to locate thepivot at a point perpendicular to the center of travelof the stud in the crosshead. (See Fig. 43.) The link
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