. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fiii. 3.—Robertson process of tube making. the ingot is held by its tenon and mortise extremity, e, in the head, s. which is movableunder the action ofthe screws, o and p. Through successively reducing the duimeter ofthe draw plate, this process permits of drawing out a tube conical externally, like a gun The Robertson Process.—The mandrel, D (Figs. 3, 4, o), of the apparatus of Mr. James ZZZ^ZQ. Fig. 4.—Robertson p
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fiii. 3.—Robertson process of tube making. the ingot is held by its tenon and mortise extremity, e, in the head, s. which is movableunder the action ofthe screws, o and p. Through successively reducing the duimeter ofthe draw plate, this process permits of drawing out a tube conical externally, like a gun The Robertson Process.—The mandrel, D (Figs. 3, 4, o), of the apparatus of Mr. James ZZZ^ZQ. Fig. 4.—Robertson process of tube making. Robertson of Glasgow, revolves within the ingot, C, and is at the same time pushed forwardby the hydraulic press, E. The rotary motion is given by a train, the pinion of which isfixed by tongue and groove to the shaft, /. The draw-plate. A, which firmly keyedbetween the jaws, B. is slightlv conical, so that the ingot. C, fixes itself in the die by thevery pressure of the mandrel. The form of the mandrels varies according to the metal and? ^ temperature of the ingot. The one v^.y///M^//viim> /J^^ shown in Fig. 5 serves to convert cold tl I (O) copper and soft steel ingots into thickVuXw^^<ZA \^ sided tubes that are afterward drawn Y/y/////:///////,. Fig. 5.—Robertson tube mandrel. out. The point is provided with threelongitudinal grooves, enlarged fromthe point to the base, and with rounded sides, so as to displace and face back the metalwithout cutting it, and designed likewise for the passage of the petroleum for lubrica
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
