File:American engineer and railroad journal (1893) (14781192163).jpg

Identifier: americanengineer85newy (find matches)
Title: American engineer and railroad journal
Year: 1893 (1890s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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nd is provided witli ad-justable trip dogs H arranged to swing outof the way when the spindle is operated byhand. / is a tappet on the spindle for strik-ing the dogs on the shaft G. Valves J andA operated by lever L permit the air andoil to pass freely in either direction and arcused when the spindle is operated by hand,this hand operation being performed bymeans of wheel M. Tlie hand wheel N isfor moving the head in and out on the arm.The manufacturers state that the efficiencyof this drill is best indicated by the size ofmotor needed to do the same work whencompared with a geared radial drill of thesame size. On a geared radial it is statedthat to drive the friction load at 330 r. p. m.requires 3.5 h.p., while on the hydro-pneu-matic drill under the same condition but .8h.p. is needed. The working load on ageared drill, using a l in. drill, 338 r. p. m.,.022 in. feed per revolution of spindle, drill-ing 7.4 ins. per minute, is equivalent to 30h.p., while the working load of a hydro-
Text Appearing After Image:
SECTIONAL VIEW OF .\LL-GE.\RED MULTIPLE SPINDLE DRILL. ALL-GE.-\RED MULTIPLE SPINDLE DRILL. pneumatic drill with the same speed and feeds is but 8 h.p.These drills are now furnished in two sizes, 4 ft. and 6 ft., andit is expected that other sizes will be manufactured later. All-Geared Multiple Spindle Drill. To obtain the same high efficiency in production with a mul-tiple spindle drill that is given by other high speed drilling ma-chines is the object of the new all-geared design exhibited whichis shown in the accompanying illustration. It has been found that the extremely tough high grade alloysteels entering into the construction of automobiles and otherhigh grade work are not capable of being machined in as effi-cient a manner on the multiple spindle drilling machines inuse and at the same time allow the full benefit of the high speeddrills to be obtained. These machines were of the universaljoint principle, and it was believed that too large a proportionof the power was being co

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