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 .. . agonal position with ashort bar or chisel, used as a pry, and which holds theboxes firmly together. For small work the flask ishinged together on one side with an iron hinge so designedas to be readily slipped apart. ^ The vents or holes down through the cope for pour-ing the metal, are called gates, and are made by placingtapere
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 .. . agonal position with ashort bar or chisel, used as a pry, and which holds theboxes firmly together. For small work the flask ishinged together on one side with an iron hinge so designedas to be readily slipped apart. ^ The vents or holes down through the cope for pour-ing the metal, are called gates, and are made by placingtapered pins or wedges of proper size in the cope andtouching the wood pattern. These, being withdrawn,leave the desired gates or ways for the molten metal topass into the mould in the sand. 28 PATTERN MAKING drag) should again be turned over, taken apartand the wood pattern removed, leaving the fin-ished mould as shown in cross-section, Fig. many instances it is customary to part thesand entirely by the use of the moulders trowel,especially where the pattern is of some simpleform, or where only a few pieces are required,as, for example, the small connecting rod shownin Fig. 6. In this case a flask is filled with sandand smoothed off, after which the pattern or. patterns are pushed down into the sand abouthalf of their depth, or to such a point as willmost readily permit their withdrawal from eitherway. The moulder then smoothes the sanddown and packs it thoroughly around the pat-tern with his trowel. Then a parting is madevv^ich dry sand and the cope is placed in positionand rammed up as previously described. SeeFig. 7, which shows a cross-section through thesame pattern in the sand. Many other forms of AND FOUNDRY PRACTICE 29 castings are parted in this manner where theparting, instead of being on a plane with theparting in the flask, is curved or has suddencrooks and offsets. In such cases the sand ispacked in the drag to conform as nearly as pos-sible to the crooks in the pa
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License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicagofjdrakeco
