274 FARM MACHINERY REPAIR 



241. Hammers. A ball-peen machine hammer and a 

 light-weight riveting hammer are needed for many repair 

 jobs. 



242. Chisels. The flat chisel, usually referred to as a 

 cold chisel, is useful for cutting rivets or old bolts. Other 

 special-shaped chisels are useful for cutting key ways and oil 

 grooves. 



243. Files. There is a number of types of files designed 

 for different uses. Files are used either for smoothing down 

 pieces of work or for sharpening tools such as saws and tools 

 with cutting edges like hoes. Files can be secured of all de- 

 grees of coarseness from the rasp used by the horseshoer to 

 the very smooth-cut file used for finishing hard metals. A 

 rasp, one or two flat files, one or two triangular, and several 

 round files should be provided for general repair work. 



244. Screw-drivers. Several screw-drivers of different 

 sizes are needed. Keep sides of point of the screw-driver 

 filed parallel to prevent injury to slot in screw. 



245. Pliers. Cutting pliers as well as holding pliers are 

 needed . Do not use a pair of pliers where a wrench should be 

 used, or for cutting extremely hard wire when a file will give 

 best results. 



246. Hack- Saw. The hack-saw is very useful for cut- 

 ting pipes, bolts or other pieces of soft metal. It may also be 

 used for cutting slots in screw heads or for similar work. 



247 . Drills . The most common drills are the breast, post 

 and ratchet drills. The breast and ratchet drills are best 

 suited for general repair work since they can be used at any 

 place without taking a machine apart. The breast drill is de- 



