. Railway age gazette . 60 lb. Under a load of 17,090 lb. the cross tube, on whichthe tension was applied, commenced to scale, indicating that theelastic limit of the steel in tension had been reached. Connection B failed by shearing the rivets in the stringertube under a maximum load of 4,7-10 lb. Connection C failed under a maximum load of 5,800 lb. byshearing off the rivet in the cross tube and pulling through therivet connection in the stringer tube. HORIZONTAL DRILLING MACHINE A horizontal drilling machine designed for heavy work withIiigh speed drills in hard material has recently been b
. Railway age gazette . 60 lb. Under a load of 17,090 lb. the cross tube, on whichthe tension was applied, commenced to scale, indicating that theelastic limit of the steel in tension had been reached. Connection B failed by shearing the rivets in the stringertube under a maximum load of 4,7-10 lb. Connection C failed under a maximum load of 5,800 lb. byshearing off the rivet in the cross tube and pulling through therivet connection in the stringer tube. HORIZONTAL DRILLING MACHINE A horizontal drilling machine designed for heavy work withIiigh speed drills in hard material has recently been brought outby the Detrick & Harvey Machine Company, Baltimore, Md. The general design is similar to that of a horizontal boring anddrilling machine of the traversing column type, having a fixedwork table, a column traversing horizontally on the runway anda saddle traveling vertically on the column. The spindle is of hammered high carbon steel with a taperedfront bearing 7H in. in diameter running in a phosphor bronze. High Speed Horizontal Drilling Machine for Heavy Work bushing, with adjustment for taking up wear. It has a dust proofroller thrust bearing and is provided with a standard taper sockethole. The spindle is driven by a 20 h. p. 4 to 1 variable speedmotor, mounted on the top of the column. All driving gears areof cast steel or manganese bronze, while the pinions are of highcarbon steel. No belts or chains are used on the drive or spindle speeds range from 60 to 240 r. p. m. The power feed is driven from the spindle sleeve gear and hasall steel gears and clutches with a steel pinion engaging in a rackwhich is cut from the solid on the steel feed quill. There are fourchanges of feed ranging from .004 to .09. The vertical movement of the saddle and the horizontal move-ment of the column are obtained through hand wheels conven-iently located at the operators platform; the column is mountedon rollers to reduce friction on the runway. Both the saddle andthe column
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1913
