. Model engine construction, with practical instructions to artificers and amateurs. alve, as mentioned above,and the other end is screwed into a block, whichby means of a pivot, unites with the eccentric-rod;the spindle passes through a steam-tight stuffing-box and gland. In large engines, there is a guide tokeep the slide-valve in a straight line; but this isnot absolutely necessary in small models, the stuffing-box and gland being sufficient for this purpose. The eccentric-rod is an iron wire, circular orflattened, screwed at one end into the eccentric-strap, and at the other end having a h
. Model engine construction, with practical instructions to artificers and amateurs. alve, as mentioned above,and the other end is screwed into a block, whichby means of a pivot, unites with the eccentric-rod;the spindle passes through a steam-tight stuffing-box and gland. In large engines, there is a guide tokeep the slide-valve in a straight line; but this isnot absolutely necessary in small models, the stuffing-box and gland being sufficient for this purpose. The eccentric-rod is an iron wire, circular orflattened, screwed at one end into the eccentric-strap, and at the other end having a hole passingthrough it for the spindle-pin; instead of this,however, it may be forked at this end. The eccentric-strap is a brass casting, either cast TEE STEAM-ENGINE. Ill in two halves, or if solid, it must be equally halvedby a saw-cut, going right through the centre of thehole or aperture cast in it, entering and coming outin the middle of the lugs, through which the boltspass. It must be filed smooth all over, and, with around file, the inside of each half filed out, until it. Fig. 36. accurately fits upon the eccentric-pulley, when thetwo halves are brought together, and yet allow theeccentric to revolve freely inside. After fitting, drilla hole through each lug and pass two bolts through,which are tightened up with nuts; a small hole canbe drilled, and an oil-cup screwed in for oiling theeccentric-pulley (see Figs. 36 and 37). 112 MODEL ENGINE CONSTRUCTION. The eccentric-pulley is a circular brass casting, oris turned out of a bit of brass rod: the former isadopted for the larger sizes. This has a groovecast around the circumference, as well as a tenon orprojecting boss attached to one side, for the purposeof gripping it in the lathe-dog when chucking; theother side has, sometimes only, a second boss cast
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmachinery, bookyear18
