PATTERN MAKING 



37 



They can be bought in sizes running by sixteenths of an inch from 

 ^ inch to 1 inch. For holes larger than one inch, the No. 2 

 extension bit, shown in Fig. 75, is the best. It has two cutters, 

 and will bore a hole of any size from inch to 3 inches in diameter. 



Pig. 75. 



For screw-holes, the gimlet bit or the twist drill for wood, 

 both of which are illustrated in Fig. 76, can be bought in all sizes 

 running by thirty-seconds of an inch from -gV inch up to |- inch: 



Fig. 76. 



The brace screw=driver, and also the brace countersink for 



screw-heads, are important tools. They are shown in Fig. 77, and 

 can be Bought in large, medium, and small sizes. 



Pig. 77. 



The half -round cabinet file and half-round cabinet rasp, shown 

 in Fig. 78, enter largely into the work of the pattern maker, and 

 should be bought in sizes each of 6 inches, 8 inches, and 10 inches. 

 Larger as well as intermediate sizes may often be found necessary, 

 but will not be needed for ordinary work. 



