. Appleton's dictionary of machines, mechanics, engine-work, and engineering. tools and others. Brass and gun metalare also worked dry, although the turning tools are nearly rectangular, as the copper becomes so farmodified by the zinc or tin, that the alloys, although much less crystalline than cast-iron, and less duc-tile than copper, yield to the turning tools very cleanly without water. But when tools with rectangular edges are used for wrought-iron and steel, on account of the greatercohesion of these materials, they must be lubricated with oil, greese, soap and water, or other matter,to
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. tools and others. Brass and gun metalare also worked dry, although the turning tools are nearly rectangular, as the copper becomes so farmodified by the zinc or tin, that the alloys, although much less crystalline than cast-iron, and less duc-tile than copper, yield to the turning tools very cleanly without water. But when tools with rectangular edges are used for wrought-iron and steel, on account of the greatercohesion of these materials, they must be lubricated with oil, greese, soap and water, or other matter,to prevent the metals from being torn. And the screw-cutting tools, many of which present much sur-face friction, and also rectangular or still more obtuse edges, almost invariably require oil or other unc-tuous fluids for all the metals. In the practice of metal turning the diamond point a b, Fig. 2845, is occasionally used in turninghardened steel and other substances; i I, Fig. 2845, are constantly used in engraving by machinery,and in graduating mathematical TOOL, KADTAL DUTLLTNO— By Messrs. Wiirnvoirni A Co., Manchester. This is an entirelydifferent arrangement of drilling machine from those before described. It embodies the elegant feedingapparatus introduced by the same makers, and described in tin- account already given of their vertical drilling machine, p. 887 ; but in that form of the machine the drilling spindle docs not admit of any lat-eral motion; it is strictly confined to the same vertical position, and in that can rise and fall at the will 774 TOOL, RADIAL DRILLING. of the operator; but in this the drill-spindle has not only the same vertical and revolving motions as inthat form of the machine, but admits also of a lateral motion whereby it can be brought over the workinto any required position within the limits of the radial arm D, on which the whole drilling apparatusis carried. The arrangement consists of a strong upright framing A A, Fig. 3650
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
