. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . GUN MACHINEEY. 1793. other, each of which is used in turn by adjusting the tracing rack J to the bar to be copied ; andin this way any form, however recondite, can be accomplished as easily as a regular spiral. In the greater number of rifled guns the depth of the grooves is uniform, but in others it is avarying surface at diiferent positions of the bore ; hence it is necessary to have the cutting instru-ment arranged so as to vary in depth as it proceeds a
. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . GUN MACHINEEY. 1793. other, each of which is used in turn by adjusting the tracing rack J to the bar to be copied ; andin this way any form, however recondite, can be accomplished as easily as a regular spiral. In the greater number of rifled guns the depth of the grooves is uniform, but in others it is avarying surface at diiferent positions of the bore ; hence it is necessary to have the cutting instru-ment arranged so as to vary in depth as it proceeds along the gun. It is also of importance thatthe cutter should not rub on the gun as it returns, since the rubbing afíects the maintenance of afine cutting edge on the tool, and smoothness of cutting is an essential condition. It is thereforenecessary that the cutting tool shall be in a slide-rest or holder in the head of the rifling bar, andcapable of being drawn out or in transversely as required. For this purpose the rifling bar C ismade hollow, and the tool holder in the rifling head K, Fig. 3420, is actuated by an inclined slotL in the internal feed
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Keywords: ., bookcentury1800, bookdecade1870, bookidsp, booksubjectengineering
