Pattern-making by Willard G. H & Crawshaw Fred D. (Fred Duane) b. 1874

Author:Willard, G. H & Crawshaw, Fred D. (Fred Duane), b. 1874
Language: eng
Format: epub
Tags: Patternmaking
Publisher: Chicago, Popular mechanics company
Published: 1910-03-25T05:00:00+00:00

SIMPLE PATTERNS

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be cored in the ends. Some shops drill these holes; others want them cored. When coring them, fasten onto the pattern a heel core print, as shown by B B, Figs. i8i and 182. A shows the holes and the way they look when the casting is taken out of the sand. B shows the prints; they should have plenty of draft, so that when the molder sets the cores into the mold there will be plenty of room to enter into the hole made by the print.

In Fig, 182 A shows the holes, B the core print, D the draft on print, and E the draft on the inside of pattern. The prints should be of uniform size, so that one core box will do for all the cores. The box is shown in Figs. 183 and 184. Hard wood is preferred for these core boxes, as there are many cores to be made in one box. Split the box through the center on the line E, so that the core will come out easily. It is made in two parts, and doweled together by pins F. In making the box one section is made the same thickness as the core print, and through this is a hole the same shape as the print, so that the print will fit snugly into the hole. The shape is shown by C, Fig. 183. Another part of the box is made the same thickness as the rib on the pattern, with t^vo holes J4 in. in diameter bored as shown by D £>, i^ in. apart, with the bottom hole on a line with the bottom of the

core print as shown. Fig. 184 shows another view of this box. D is the flat surface that the core is baked on and corresponds to the surface B shown in Fig. 182. C is the line of the casting, B shows the thickness and shape of these prints where they core, A A are the holes, E the draft on the inside of the casting or ribs at this point, and F F the dowel pins. When the coremaker makes the core, he rams the box up with core sand and lays it down on a plate with the surface D next to the plate. This is the surface of the core that it is baked on, because it is flat and has the largest flat surface of the core. The two halves of the box, A and B, Fig. 183, are drawn away, leaving the core as shown in Fig. 185. A is the core print part of the core, B B the cores proper, and C the surface that the core is baked on and also the outside of the core. The manner of setting it into the mold is shown in Fig. 186. C is the space made by the pattern, B the space made by the core print, E the outside surface of the core print, A is

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