The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . Fig. 110. A Molding-Bench. Gbap. III.] CORES AND CORE-PRINTS. 113 something must be removable after the cast is made, and theiemust be at least one opening for the removal. That which isso placed in the mold is called a ••core The meaning of theword is also extended so as to include additions to the moldoutside the space to be filled by the liquid where the core is tobe supported, or where an additional cavity is required in orderto make a sma
The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . Fig. 110. A Molding-Bench. Gbap. III.] CORES AND CORE-PRINTS. 113 something must be removable after the cast is made, and theiemust be at least one opening for the removal. That which isso placed in the mold is called a ••core The meaning of theword is also extended so as to include additions to the moldoutside the space to be filled by the liquid where the core is tobe supported, or where an additional cavity is required in orderto make a small projection to the main body of the exterior parts of the mold which are to be filled by thecores or core-ends are called core-prints. Fig. Ill gives a vertical section of a mold ready for parts of the pattern have been drawn; a central core e. Fig. 111. Section or a Flask, Mold, Cokes, etc. is shown extending at top and bottom into the core-prints madefor it; there is also an external core, c, having a cavity initself which is to contain a sort of horn to the main the pattern of the horn had been put on the main pattern itwould have been impossible to get the pattern out of the mold,but by the use of the core it becomes easy. The cope, drag,and bottom-board are shown in position; the plugs have beendrawn from the pouring-gate Gr, and the riser M, and fine wireholes have been made to the points y, v to allow the gases toescape. Cores are made of a mixture of sand and some adhesivematter. Usually a little flour is mixed with the core-sand. 114 THE SECOND, OR MIDDLE YEAR. [Chap. in. This when moistened forms paste, and when dry or baked makesa firm block. Powdered rosin when lieated in the baking willalso fasten the sand. Cores must be porous, and hence they areusually made of a coarser sand than the regular mold. A
Size: 2065px × 1210px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmanualt, bookyear1906
