. Foundry practice; a treatise on molding and casting in their various details. ..., 1,,—r Fig. 7. The gate stick is loosened by rapping sidewise andwithdrawn. The hole is reamed out, leaving a largeopening to pour the iron into, as shown in Fig. 7. Thecope is ready to be lifted off and placed on any convenientrest where it may be finished. The cope should alwaysbe finished before the drag is touched, for, if anythinghappened to necessitate shaking it out, the drag is readyto have the cope replaced for another ramming. Theportion of the cope that covers the pattern should beslicked lightly wit
. Foundry practice; a treatise on molding and casting in their various details. ..., 1,,—r Fig. 7. The gate stick is loosened by rapping sidewise andwithdrawn. The hole is reamed out, leaving a largeopening to pour the iron into, as shown in Fig. 7. Thecope is ready to be lifted off and placed on any convenientrest where it may be finished. The cope should alwaysbe finished before the drag is touched, for, if anythinghappened to necessitate shaking it out, the drag is readyto have the cope replaced for another ramming. Theportion of the cope that covers the pattern should beslicked lightly with the trowel, then covered with plum- 6 FOUNDRY PRACTICE bago with a soft camels hair brush, or by dusting from asack and then slicking with a trowel. The gate should bereamed slightly to take off the loose edge and pressed tofirmness with the fingers. The drag should be brushedoff to remove the parting sand; then wet the sand aroundthe pattern slightly with the swab. If the sand is too wetat any point the metal will blow when poured, therefore ^ l € y h;:af >. Fig. 8. care must be exercised in putting on only as much wateras is necessary to make the sand stick together well. Thepattern may now be drawn by driving the draw spike intothe centre of the pattern, then rapping it until the sand isfree from the edges of the pattern; then lift the patternout by slowly raising it, as shown in Fig. 8. The mold isslicked over lightly and patched in case the pattern tears GREEN SAND MOLDING 7 the sand at any place. The pouring gate is now con-nected to the mold by cutting a runner from the mold tothe gate of a size that will admit the iron freely, but itmust be smaller than the portion of the casting where itconnects so that the runner may be broken off easilywithout damage to the casting. The runner should besmoothed with the fingers or a slicking tool to ensure
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