. Model engine construction, with practical instructions to artificers and amateurs. line in both bearings, the detachedpiece forms the cap, or upper half of the brasses ;widen the vertical holes in this with a rimer, sothat they will easily slip over the bolts, screwed intothe plummer-block, and be tightened up by the centre of the saw-cut in both. Drill atransverse hole through each, of such a size asallows the journals of the axle room to revolvefreely inside, then drill a small hole through thecap for oil. Note.—Bearings should be fixed to the bed-plate,so that the crank-shaft is
. Model engine construction, with practical instructions to artificers and amateurs. line in both bearings, the detachedpiece forms the cap, or upper half of the brasses ;widen the vertical holes in this with a rimer, sothat they will easily slip over the bolts, screwed intothe plummer-block, and be tightened up by the centre of the saw-cut in both. Drill atransverse hole through each, of such a size asallows the journals of the axle room to revolvefreely inside, then drill a small hole through thecap for oil. Note.—Bearings should be fixed to the bed-plate,so that the crank-shaft is at right angles to thepiston-rod, and exactly in line with it, when thecylinder is bolted down in position. Standards for vertical engines are fitted up inthe same way, and must be so bolted to the bed- 102 MODEL ENGINE CONSTRUCTION. plate, that the central axis of the crank-shaft willstand vertically over the centres of the piston-rodand eccentric-rod. In an ordinary steam-engine,each plumroer-bloek is an iron casting, having asole, through which pass the holding-down bolts;. Fig. 32. the cap is also a casting. Between the block andthe cap is fitted the brass bush to take the bush is in two halves, which are called thebrasses or steps; these are cast with flangeson both sides to keep them in position, and to THE STEAM-ENGINE. 103 prevent them turning along with the axle. Theyare furnished with lugs, which enter correspondingrecesses in the block and cover (see Fig. 32). The crank-axle (see Fig. 33), by means of thecrank, converts the reciprocating, to-and-fro motionof the piston into a circular motion, through theintervention of the piston-rod and the crank is set at one end of the shaft,it is called a single crank. When there is a
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmachinery, bookyear18
