. Railway mechanical engineer . Apprentit Relative Positions of the Bending and Twisting Dies tions without the changing of dies. From the photograph itwill be seen that there are two plungers, one to twist theends of the material and the other to form the step. Thelower twisting die is fitted with a slotted holder at one end 642 RAILWAY AGE GAZETTE, MECHAXICAL EDITION 89, No. 12 which prc\cnts the end of tlic material from twisting, theremainder of the piece being supported on the die for aboutone-third of its width. The twisting plunger in its descentcomes in contact with about one-hal
. Railway mechanical engineer . Apprentit Relative Positions of the Bending and Twisting Dies tions without the changing of dies. From the photograph itwill be seen that there are two plungers, one to twist theends of the material and the other to form the step. Thelower twisting die is fitted with a slotted holder at one end 642 RAILWAY AGE GAZETTE, MECHAXICAL EDITION 89, No. 12 which prc\cnts the end of tlic material from twisting, theremainder of the piece being supported on the die for aboutone-third of its width. The twisting plunger in its descentcomes in contact with about one-half the width of the uns\ip-ported portion of the material. The piece is thus turned betweenthe two dies to a right angle with the end in the grooved \fter one end is twisted the material is reversed and the otherend twisted in the same manner. The sketcli is an end viewof the device, showing the relative positions of the two plungers,both of which are attached to the same head. The plunger HOW CAN I HELP THE APPRENTICE?*. Dies for Twisting and Bending Sill Steps which forms tlie step is in front of the twisting plunger andits operation will be readily understood from the illustrations. The iron is received in the blacksmith shop from the com-panys own rolling mill at St. Cloud, Minn., where it has beencut to length. It is dehvered by the stores department andpiled beside the machine within convenient reach of the opera-tor. Each piece is placed in the grooved holder and movedalong until the end strikes a gage which fixes the length ofthe twisted portion. After the pieces are twisted the steps areformed on the same machine, the use of a plunger to twistthe ends making it unnecessary to change dies between the twooH-rations. This device has greatly increased the output of sillsteps and has materially reduced the cost. IcNiTioN Tkmierature OF CoAL DiST.—Coal dust ignites attemperatures about 730 deg. F., provided there is enough heatpresent to ignite a suflicient quantity
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
