Pattern making and foundry practice; a plain statement of the methods of wood pattern making, as practiced in modern pattern shops, with complete instructions for sweep work and notes on foundry practice, together with numerous drawings taken from actual patterns .. . £11 £ Cto^H section ihrotigh pattern rn Ihe^ ^and place and filled up as previously described. SeeFig. 3, which shows a cross-section through themould finished and ready to receive the moultenmetal. ^ The next form to be considered is of a classwhich, while being all in one piece, is of such a ^ It is deemed more expedient to
Pattern making and foundry practice; a plain statement of the methods of wood pattern making, as practiced in modern pattern shops, with complete instructions for sweep work and notes on foundry practice, together with numerous drawings taken from actual patterns .. . £11 £ Cto^H section ihrotigh pattern rn Ihe^ ^and place and filled up as previously described. SeeFig. 3, which shows a cross-section through themould finished and ready to receive the moultenmetal. ^ The next form to be considered is of a classwhich, while being all in one piece, is of such a ^ It is deemed more expedient to most of theillustrations in this work in cross section, as a clearerunderstanding of the subject is generally derived fromthat character of design. AND FOUNDRY PRACTICE 25 shape as to render the moulding of the castingmore convenient when it is entirely up in thecope. If executed otherwise, the sand in the ssfiiiay. Cro53 section through finisheci inould cope would make it heavy and clumsy and verydifficult to handle and the cope would have atendency to drop off and ruin the mould/ In ^ It should be borne in mind that the manner of mak-ing the mould depends entirely upon the nature of thework and the purpose for which it is to be used. Thus it will be found that all, or nearly all, stove cast-ings are made in a manner exactly the reverse from thatwhich is employed in the moulding of ordinary hollow or concave parts are usually made down inthe drag, and the sand in the cope is strengthened bycross bars of wood fitted in such a manner as to come asnear the metal as is practicable, and these bars are drivenfull of nails or made with other projections in order toprevent the sand falling out. By this means a smoothcasting on the outer surface is obtained, as the metal,being heavier than the dross or other foreign substances, 26 PATTERN MAKING this case the pattern, which is assumed to beh
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicagofjdrakeco
