. Railway mechanical engineer . to increase confidence inthe static strength and in the strength under repeated stressof carefully made oxy-acetylcne welded joints in mild steelplate. Kl FICIENCIES OF \cETVl-ENE WeLDED .ToINTS IN IER CenT Joint JifTiciency Static Repeated stress stress Impact Tliickness of plate H in. yi in. 1 iti. Original material 100 100 100 Material of plate, annealed from 800° C 89 84 89 Joint welded, no subsequent treatment 100 100 53 Joint welded, annealed from 800° C 92 93 35 Joint welded, quenched, annealed from 800° 92 94 32 Joint welded, hammered while hot
. Railway mechanical engineer . to increase confidence inthe static strength and in the strength under repeated stressof carefully made oxy-acetylcne welded joints in mild steelplate. Kl FICIENCIES OF \cETVl-ENE WeLDED .ToINTS IN IER CenT Joint JifTiciency Static Repeated stress stress Impact Tliickness of plate H in. yi in. 1 iti. Original material 100 100 100 Material of plate, annealed from 800° C 89 84 89 Joint welded, no subsequent treatment 100 100 53 Joint welded, annealed from 800° C 92 93 35 Joint welded, quenched, annealed from 800° 92 94 32 Joint welded, hammered while hot lOI 107 58 Joint welded, hammered, annealed from 800° C. 95 102 53 DEVICE FOR MILLING KEYWAYS FORECCENTRIC ARMS IN CRANK PINS It is difficult to secure the correct alinement of the key-ways in crank pins and eccentric cranks if they are laid offbefore the crank pin is pressed in the wheel center. Manyroads follow this practice, however, because of the difficultyof cutting the keyway after the pin is in place. The drawing. -M- ^ ■E l[ ^1 V I ,. f rjj ->i^i<-|^|l<; -4_^^- ^y -i r A H-^^-J K—-22—H -HiKini-i M0=] D) Y 4s t::LJH0::I Nofe: g End Mill mfh r^K? T Qroove for Brass Marked a lofffin Details of Keyway Milling Attachment below shows the details of a device that is used at the WestBurlington shop of the Chicago, Burlington & Quincy fordoing this work. It consists of a guide which fits over tlieend of the crank pin and is held in place by a key and twoset screws. On the side of the guide opposite tlie key is aslot, at the end of which is a nut through which the feed screw passes. The outer end of the feed screw has a han-dle while the inner end fits in a bearing for the cutter. This1 Hearing rests in the slot and can be moved back and forthby the feed screw. On the upper side of the bearing is a lugwhich fits in a groove in the milling cutter and regulates thedepth of the keyway. The cutter is driven by an air motoras shown in the sketch of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
