. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . Fig. 105—The twin-cylinder marine engine as it looks when finished The dividing line is, of course, that through the stiffen-ing web. A core is scarcely justified in the tunnel for thecross-head. The extra weight of metal, particularly ifcast iron is used throughout, is not sufficient to warrantthe extra trouble. Besides, it is practically as easy todrill through the cylindrical portion, following with theboring tool, as it is to get beneath the gla
. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . Fig. 105—The twin-cylinder marine engine as it looks when finished The dividing line is, of course, that through the stiffen-ing web. A core is scarcely justified in the tunnel for thecross-head. The extra weight of metal, particularly ifcast iron is used throughout, is not sufficient to warrantthe extra trouble. Besides, it is practically as easy todrill through the cylindrical portion, following with theboring tool, as it is to get beneath the glass-hard scale^ left on the casting where the core has been. 154 Model Engineering The bed-plate, cylinders, flywheel, eccentrics andstraps, bearing caps, steam chests, and the few pipe fittings which are not standard, constitute the bulk of th(. Fig. 106—Plan of the engine other pattern work. The pistons, connecting rods, crank-shaft and packing glands are about as easily worked outof rolled stock as from castings. The one exception isthe cross-head which is something of a nuisance to ma-chine. The blind slot in the cross-head is a difficult pieceof work unless it is cored out in a casting and even thenit is still a nuisance. Any worker who has tried to worryout a slot of this kind will appreciate the truth of the! J A Model Twin-Cylinder Marine Engine 3.!/ 155
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Keywords: ., bookcentury1900, bookdecade1910, bookidmodelmakingi, bookyear1919
