BELT MAINTENANCE 



47 



in service. The belt is taken down from the pulleys, and the 

 belt bench having been set to the length of the belt, the clamps 

 are put on and the belt drawn up until the ends come to- 

 gether. The tension is then read, and if it is at or below the 

 minimum to which the belt should be allowed to fall in 

 service, it is cut off to a length sufficient to restore in it once 

 more the maximum initial tension. The chart, Fig. 32, on 

 page 95, is for use in connection with the tables of horse- 



FIG. 10. HEAD END OF BELT BENCH. 

 When Applying Tension to Short Belt. 



power and tension. It shows the relative stretch of belts 

 under different tensions. 



The above procedure applies to belts in excess of 16 ft. 

 hi length. If the belts are under 16 ft. long, they are not 

 passed around the drum as described, but one end is gripped 

 in an auxiliary clamp on the movable carriage as shown in 

 Fig. 9. The carriage is adjusted by means of the upper 

 scale seen at the right of the drum. The other end of the 

 belt is gripped in one of the belt clamps, the other clamp 

 being attached to the bench as shown in Fig. 10. The ten- 

 sion is then weighed by means of the scales as before. 



