PATTERN MAKING 



59 



the moulding board, and the drag inverted over it and rammed up. 

 After the drag has been turned over, the sand is cut away and 

 removed, not only down to the center of the riiii, but also to the cen- 

 ter line of the four arms, as shown by the dotted lines in Fig. 116. 



Fig. 117. 



Fig. 119. 



All cut surfaces of the sand are smoothed, parting sand is sprinkled 

 over the parting thus made, and the cope is placed in position and 

 rammed up. When the cope is lifted off, the sand will part half 

 way down on the arms and rim, allowing the pattern to be taken 

 out with ease. 



Still another example in which a single-piece pattern can be 

 used, is shown in the journal- 

 box cap illustrated in Fig. 117. 

 A cross-section of the pattern 

 through two of the bolt-hole core 

 prints is shown in Fig. 118. The 

 pattern is placed on the moulding 

 board in the inverted drag and is 

 rammed up as usual. When the 

 drag is turned over, the position 

 of the pattern in the sand is as 

 shown in cross-section in Fig. 119. 

 The sand that may have entered 



the curre c d e is lifted out, and the necessary "draft" is given 

 to the sand at the two ends of the opening c d e, as shown 

 at a, Fig. 120. The cope is next placed in position, and when this 

 has brrn-rammed up and lifted off, the sand lying in the curve c de 



Fig. 120. 



