. Railway mechanical engineer . chineto deliver any predetermined number within a range of three toeight blows in each cycle or operation. The machine thus set, thelinish of the output is necessarily uniform. I he length of timethat the grips are open for feeding can lie regulated to suit theneeds or ability of the operator and according to the length ortype of bolt being made. These changes are efTcctcd through asimple gear and cam device. The bed of this machine is of the box type, of large proportions,and is constructed to secure rigidity as well as strength. Owingto its greater rigidity a
. Railway mechanical engineer . chineto deliver any predetermined number within a range of three toeight blows in each cycle or operation. The machine thus set, thelinish of the output is necessarily uniform. I he length of timethat the grips are open for feeding can lie regulated to suit theneeds or ability of the operator and according to the length ortype of bolt being made. These changes are efTcctcd through asimple gear and cam device. The bed of this machine is of the box type, of large proportions,and is constructed to secure rigidity as well as strength. Owingto its greater rigidity a four-blow bolt made in this machine issaid to be equal to a five or si.\-blow bfdt produced in machines oftlie usual design. The bolt being made in less blows and lesstime, there is a better fiow of the metal to fill out the is also possible to work the metal at lower heats, reducing thetendency of the metal to liulge at the top and sides of the bolthead. Another departure in this design is the lever construction for. Yol<e Constructii of the Lever Carrying the Lower Har carrying the lower hammer. This is usually carried in a slidethe same as the side and top hammers: scale from the bolts asthey are being forged drops on this slide, and together with theaction of the water, results in excessive wear and disalinementof the lower hammer. The lever construction eliminates thiswear. The side and top hammer slides in this design are operatedliy bronze bushed Hnks in place of cams and rolls. The camconstruction has been eliminated because of its excessive wear,and the fact that it promotes spring and lost motion in the ham-mer slides. The fly-wheel is of the National Iriction-shp construction,which acts as an automatic safety device in case cold stock or anexcess of metal is gripped in the dies and obstructs the travel ofthe heading tool. This fly-wheel also serves as a protection tothe motor when the machine is direct motor driven. The rigid construction combined with
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
