358 



LIGHTING AND SANITARY EQUIPMENT 



328. Pipe Cutters. Pipe cutters (Fig. 345) are divided 

 into two general types the three-cutter wheel and the one- 

 cutter wheel types . The one-cutter wheel can be secured with 

 solid back or with two rollers; the latter type is probably in 



FlG. 345. Three-wheel pipe cutter. 



most general use. The three-cutter wheel type has the ad- 

 vantage of being used in close quarters. This type of cutter 

 forms a burr on the outside of the pipe which must be re- 



FIG. 346. Stock and die. 



moved with a file before the threads can be cut. The pipe 

 does not need to be reamed out, however. 



329 . Die-stocks and Dies . It must be remembered that a 

 different die is used for threading a pipe than for threading a 

 bolt. The pipe thread is a taper thread, making possible a 

 tight joint. The solid type of die is most commonly used 

 (Fig. 346). A number of dies for different-sized pipe can be 

 secured and used in the same stock. The adjustable type of die 

 is used in a special stock. A ratchet stock is sometimes used. 



