Full text of "Modern Mechanical Engineering Vol-I"
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ro6 PATTERN-MAKING tools, grinding wheels and circular oil-stones are obtainable. Included in the equipment of some shops is the conical oil-stone for sharpening the con- cave bevels of paring gouges. All the machines in a shop, the lathes excepted, should be in the charge of a man or men who alone operate them and are responsible for their Fig. 88. — Mechanical Wood- worker operating on Three-way Valve Core Box with numerous Internal Chambers The core box shown was completed in forty-five minutes. Approximate time by hand forty-five hours. efficiency. This is both economical and safe, since circular saws and planing- machines are fruitful of accidents to inexperienced hands. The lathes are used by all the pattern-makers, who also grind their own tools. CHAPTER IV The Shop and the Stores The lay-out of the pattern-shop does not reveal those aspects of interest which are associated with the machine-shop and with some of the later foundries. The real attraction centres in the work under construction. The lay-out is similar to that of the carpenters and joiners. Rows of benches disposed across the shop accommodate two men each, working at opposite