PART VI 



BELTS AND BELTING 



CHAPTER XXX 



KINDS OF BELTS AND BELT LACES 



* 



295. Methods of Connecting Machines. There are 

 three common methods of connecting machines (1) by shaft, 

 known as direct-connected ; (2) by gear wheels, the one on the 

 driving machines being known as the driver and the one on 

 the driven machine being known as the follower, and (3) by 

 belts, in which case the names of the machines are those given 

 when gears are used as connectors. 



296. Four Kinds of Belts. There are four common 

 forms of belts chain, canvas, rubber and leather. Chain 

 belts, except for slight wear in link joints, remain constant in 

 length; hence, need no tightening as they grow old. The 

 other three materials named, however, stretch, and, conse- 

 quently, belts made from them need tightening from time to 

 time to prevent their slipping. The usual method of tight- 

 ening is to cut the belt, remove a piece and fasten the ends 

 together. 



Canvas, rubber and leather belts may be cemented to- 

 gether. However, the result with canvas belts is not very 

 satisfactory. When rubber cement is used, a rubber belt, if 

 not too old, may be cemented successfully. However, the 

 method of fastening the ends of a belt is applicable princi- 

 pally to leather belts. 



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