File:Appletons' cyclopaedia of applied mechanics- a dictionary of mechanical engineering and the mechanical arts (1880) (14593908928).jpg

Identifier: appletonscyclopa02dapp (find matches)
Title: Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts
Year: 1880 (1880s)
Authors: D. Appleton and Company Benjamin, Park, 1849-1922
Subjects: Mechanical engineering -- Dictionaries
Publisher: New York, D. Appleton
Contributing Library: Mugar Memorial Library, Boston University
Digitizing Sponsor: Boston University

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rcumference of 244 LATHE, METAL-WORKING. the plate are to receive the heads of the bolts used to fasten work to the plate In lathes of thisclass the cutting tool is held by two clamping plates, because one screw would not hold the tool with m^fZ^Hed Wheel-turmng Lathe is represented in Fig. 2595. The heads of this lathe areimusuallv rieid bein box-framed; that is to say, the outer surface is a continuous piece, withoutany o^panels ors?andards-a form which, in conjunction with the broad base of the head givesereat solidity. From the extra width of the bed the pressure of the cut always falls w.thin the bedsurface The feed-motion for the slide-rest is obtained by an independent overhead rock-shaft.In thislathe there are two face-plates, the object being to enable the workman to operate each sep-arately, so as to be boring on one while chucking work on the other, or to drive the work from bothface-plates when necessary to avoid the spring due to the torsion produced by a heavy cut; while
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in wheel-turning both wheels may be operated upon simultaneously. The slide-rest may be oper-ated by hand or by handles or pendants, which are connected to the screw by a ratchet motion sothat by an overhead motion the handles may be actuated vertically and reciprocally thus making theslide-rests self-acting. The pendants are lifted by the overhead motion and fall of their own weight,the amount of movement and hence of feed being regulated at will. mmtm*moA Boring Lathes —In Fi. 2596 is shown a combined machine of unusual dimensions manufacturedby Messrs. Bement & Son of Philadelphia, which is adapted for boring cylinders of large dimensionsfor drilling the bolt-holes in their flanges, and for surfacing the latter. The bed of the machine is39 feet long, and it carries at one end a fixed standard A, which supports the gearing and boringbars. The latter is carried in the hollow spindle D, which slides through the spur-wheel Aand isdriven through the stepped pullevs T. By means of

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