. Railway mechanical engineer . s are being set up in the machine, the final portionof the Hookes joint next the wheel is provided with a springplunger in the form of a lathe center, and the driving plateis bolted to the wlicel spokes with this plunger entered intothe center mark on the end. A tachometer driven offthe motor shaft pennits the speed, in miles per liour at whichvibration begins, to be noted. Brake equipment, comprising two brake blocks per wheel,is provided in order that the wheels may be quickly broughtto rest at the end of a run. The brakes may be appliedeither by means o
. Railway mechanical engineer . s are being set up in the machine, the final portionof the Hookes joint next the wheel is provided with a springplunger in the form of a lathe center, and the driving plateis bolted to the wlicel spokes with this plunger entered intothe center mark on the end. A tachometer driven offthe motor shaft pennits the speed, in miles per liour at whichvibration begins, to be noted. Brake equipment, comprising two brake blocks per wheel,is provided in order that the wheels may be quickly broughtto rest at the end of a run. The brakes may be appliedeither by means of a hand wheel or by admitting air at 90-Ib. pressure to a standard 8-in. cylinder. Before a test is made the small portions of the axle journals-projecting clear of the spring bearing brasses are smearedwith red lead, and the point of a spring plunger marker—clearly shown in one of the illustrations—is brought withina short distance of each smeared surface. These markerswhen vibration begins, scrape away the red lead lying. Balance Weights Applied to Wheels with Outside Cranks towards the radius of the wheel along which the unbalancedcentrifugal force is developed. It is the common practice in Great Britain to take the re-volving masses plus two-thirds of the reciprocating masses,and to regard the sum as the total revolving mass to be bal-anced. For each type of wheel the calculated amount of therevolving and reciprocating masses to be balanced is repre-sented by a weight or weights attached to the crank pins,the weights in the case of an inside cylinder engine beingsplit and held to the crank pins by means of straps. Tosecure correct results it is important that the weights rep-resenting the portion of the reciprocating masses to be bal-anced should revolve in the plane in which these massesreciprocate. In the case of coupled wheels, therefore,temporary extension pieces are attached to the crank pins. so that tlie weights representing the reciprocating massesmay be brough
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
