16 



BULLETIN 399, U. S. DEPARTMENT OF AGEICULTUBE. 



The strips are wound spirally on the drum until it is entirely 

 covered and are then nailed down smooth with No. 3 nails placed 

 about an inch apart. It is essential that no sharp corners or edges 

 of the metal be left projecting, since these will cut the fruit and cause 

 trouble. 



The details of the frame construction are shown in figures 6 and 7. 

 .The frame is made of pieces 4 by 4 inches mortised together and 



Fig. 7.— Side view of the peeling machine, with the cover removed. 



properly braced with iron. At the lower end of the machine the frame 

 is 20 inches high and at the upper end 32 inches high, so that one 

 end of the drum is 12 inches higher than the other. The frame is 

 fastened to the floor by lag screws, the ends being further secured 

 by iron braces in order to receive the end thrust which is caused by 

 the drum being higher at one end. 



The feed screw (figs. 6, 7, and 9,E). — The feed screw is the same 

 length as the drum. It is built with 2-inch galvanized-iron pipe as 



r^ 



m 



Fig. 8.— Top view of the feed table. 



a shaft, on which is soldered a spiral made of 22-gauge galvanized 

 sheet iron. The flights of the spiral are 3^ inches high and 4 inches 

 apart, each flight being made separately. These are then united 

 and soldered to form a continuous spiral and are set on the shaft 

 so that they project forward about 15°. The faces of the flights are 

 punched thickly with the 3-cornered punch, forming points about one- 

 eighth of an inch high on the forward face. This screw is supported 

 by pieces of a |-inch shaft set in sleeve collars held inside the pipe 

 by screws. The shaft need not extend more than 2 feet into the 

 pipe at each end. 



