. Railway mechanical engineer . e of American Flexible Staybolt the forming of the end tapers, is done by rolling, after whichthe bolt is twisted and straightened in a press, the squareends for application being formed at that time. All of theforging operations are completed in one heat and the boltsare piled while red hot, for slow cooling before tests have shown that this method of makingthe bolts has produced a material improvement in theirstrength and flexibility. The ratio of yield point, or elasticlimit to the tensile strength has been shown by tests to an in
. Railway mechanical engineer . e of American Flexible Staybolt the forming of the end tapers, is done by rolling, after whichthe bolt is twisted and straightened in a press, the squareends for application being formed at that time. All of theforging operations are completed in one heat and the boltsare piled while red hot, for slow cooling before tests have shown that this method of makingthe bolts has produced a material improvement in theirstrength and flexibility. The ratio of yield point, or elasticlimit to the tensile strength has been shown by tests to an increase of nine per cent over that generally ob-tained. The rolling process effects very little change inthe original structure of the iron and the outer fibre stresseshave been reduced to withstand a maximum lateral vibration. VERTICAL SURFACE GRINDINGMACHINE The use of grinding machines is constantly finding widerapplication to locomotive work. There are a variety of usesto which they may be put and in some instances they have. Reed-Prentice Vertical Grinding Machine been found to decrease the cost of production and at the sametime produce more accurate work, Tlie vertical surface grind-ing machine shown in the illustration is made by the Reed- Prentice Company, Worcester, Mass. This machine is de-signed for handling both surface and circular head is of rigid construction, it being practically integralwith the telescoping column back of the machine. Thevertical adjustment of the head may be obtained by eitherhand or power feed, clamps being provided to hold the headin position after it has been raised to the proper height. The bearing for the spindle is lined with nickel babbittand it may be adjusted for wear. The spindle has a bearingof 0 in. in diameter for a length of S in. A sprocket andsilent chain is used to drive the wheel spindle in pref-erence to belt on account of the moisture and dirt. Thespindle is made of alloy steel and is supported at the upperend i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
