THE PULLEYS AND BELTING OF A SEPARATOR 2OO, 



and loosened by driving on the hub of pulley as explained. 

 If a pulley is against the box and key cuts off flush with 

 the hub, it may be necessary to remove the shaft, drive 

 the pulley on until the key loosens or if key-seat be long 

 enough, a "drift" may be used from the inside. 



Covering Pulleys. The smaller pulleys or those on 

 which the belts are likely to slip are covered or lagged with 

 leather or other similar material. The important thing in 

 covering any pulley is to get the leather tight, because it 

 will soon come off if there be any slack in it. 



Nailed Covers. Some pulleys are cast with recesses in 

 their rims for insertion of wooden wedges. These pulleys 

 are easily lagged because the covers are fastened, simply 

 by nailing to the wooden wedges. To re-cover a pulley 

 fitted with wooden wedges, take off what remains of the 

 old cover, pull out the nails and renew the wedges if neces- 

 sary. Select a good piece of leather a little wider than face 

 of pulley and about four inches longer than the distance 

 around. Soak it in water about an hour. Cut off one end 

 square and nail it to one pair of the wedges, using nails 

 just long enough to clinch. To stretch the leather, use a 

 clamp made of two pieces of wood and two bolts. Block 

 the shaft to keep it from turning, and stretch the leather 

 by prying over the clamp with levers. The leather should 

 not be stretched around the whole pulley at once, but the 

 clamp should be so placed that there is only sufficient room 

 to nail to the next pair of wedges. After nailing, move 

 the clamp and nail to each pair of wedges in turn, finally 



14 



