. American engineer and railroad journal . uted to meetspecial conditions. A gauge is furnished to read in tons orpounds per square inch, as desired. The press is built in twosizes for 50 or 100 tons pressure. 210 AMERICAN ENGINEER AND RAILROAD JOURNAL. SENSITIVE RADIAL DRILL. What is believed to be the first sensitive radial drill made inthis country is shown in the accompanying illustration. A con-siderable amount of small drilling can be handled more econom-ical^ on a l,.I .if this type, where the high speeds are obtainedwithout the use of gearing than on the heavier and more ex-pensive rad
. American engineer and railroad journal . uted to meetspecial conditions. A gauge is furnished to read in tons orpounds per square inch, as desired. The press is built in twosizes for 50 or 100 tons pressure. 210 AMERICAN ENGINEER AND RAILROAD JOURNAL. SENSITIVE RADIAL DRILL. What is believed to be the first sensitive radial drill made inthis country is shown in the accompanying illustration. A con-siderable amount of small drilling can be handled more econom-ical^ on a l,.I .if this type, where the high speeds are obtainedwithout the use of gearing than on the heavier and more ex-pensive radial drills. This drill is especially adapted for drillsUp to ;t in. in diameter. To give some idea of its capacity itmay be said that a machine of this type, with a 2 ft. arm, drilleda M in. hole in cast iron, with a feed of .o_>8 in. per revolutionor at the rate of ioK in. a minute, using 3<4 The headthat carries the spindle is adjustable, in and out, on the swing-ing arm; the work is supported on the stationary table. All the. are equipped with specially designed ball bearings. They aredust proof and form a retainer for the lubricant, which needs tobe renewed only at long intervals. The spindle has six changesof speed, ranging from 300 to 900 revolutions per minute, and isprovided witli a ball thrust bearing. It is fed by a long handlever on a ratchet wheel, the latch handle being self releasingwhen in the uppermost position. A convenient star wheel sup-plies a quick return movement to the spindle. The table is 35 in. above the floor, a convenient height for theaverage operator. The top and front sides are fitted with Tslides, planed from the solid. The column is of tubular section,internally ribbed, and extends through the arm into the cap at thetop of the drill. This machine with the 2-ft. arm drills to thecenter of a circle 49 in. outside of the column; the minimumdistance from the spindle center to the column is 6% in., andthe maximum distance from the spindle
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
