PATTERN MAKING 



57 



The second half of the pattern is now placed in position on 

 the first, and dry parting sand is spread over the surface of the 

 wet or "green" sand; the cope is put in position on the drag, as 

 shown in Fig. 110, and rammed up. Upon the cope and the drag 



Fig. 109. 



Fig. 110. 



being separated, the sand will separate on the line to which the 

 parting sand has been applied, which, as will be seen, is the line 

 of parting of the cope and the drag, one half of the pattern remain- 

 ing in each. 



c 



r 



. ., _ii - % > 



- * 4 L ' _ ' . 



*'.* * . * . -.. ,*;. 

 j 4 * . . 4 % , . '^ ./.*,' ' . 



d 



D 



Fig. 111. 



After the pattern has been removed (one half from the cope, 

 and the other half from the drag), the completed dry sand core is 

 placed in the moulds made by the core prints x and y. This core 

 B is shown in position 

 in Fig. Ill and entirely 

 fills the parts of the 

 mould made by x and y, 

 leaving between Hself Fig. '112. 



and the surface of the mould made by A, room for the metal to 

 be poured which is to form the required cylinder. 



In moulding the above cylinder it is not necessary that the 

 pattern should be parted (made in two halves) as shown in Fig. 



