File:Cassier's magazine (1904) (14745950546).jpg

Identifier: cassiersmagazi2719041newy (find matches)
Title: Cassier's magazine
Year: 1891 (1890s)
Authors:
Subjects: Engineering
Publisher: New York Cassier Magazine Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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section of theSchiele curve, which is anideal form. In later ma-chines an approximation tothis is employed, flat, conedsurfaces being used, as beingmore easily machined. Alarge surface support is givenon the back of the face-platewhen doing heavy turning.For boring and turning ofsmall diameters at highspeeds the spindle is liftedclear of this face, and it runson the spindle alone. The attendant of the bigmachine is dwarfed beside it.Two results follow, one beingthat he must be accommo-dated with a seat or a plat-form, which, in some cases,must travel along with thework or the tool-slide. Theother is that all or most ofthe operating handles mustbe brought to one location,close within his reach, if longperambulations about themachine are to be avoided. A necessary equipment ofsome big machines is a cranefor handling work of a re-petitive character, and soprevent holding up the shoptravellers which are wantedfor the general service. Gen-erally these are hand cranes, 2l6 CASSIERS MAGAZINE
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S o « 5 g to BIG MACHINE TOOLS 217 but we may expect to see light electriccranes and hoists attached to the bigtools The tendency of design in the smallermachine tools is to restrict the range oftheir operations, in order to render themsuitable for producing specialties. Butthe tendency in big tools is in the otherdirection, namely, to increase theirrange of utility. The reason is that alarge machine with a very restrictedscope of operations would seldom beemployed profitably all the time, andthe capital outlay on it is too great topermit this. Hence, we have extensionboring and turning mills; combinedplaning, drilling, milling, and tappingmachines; heavy break lathes capableof doing work between centres, turningface work, and screw-cutting; duplexboring mills with adjustable centres,capable of being operated simultaneouslyor independently. The capacity forwork is also increased by multiplyingtool boxes, as in big planers, whichhave boxes on uprights and cross rail,all capable of sim

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