CREAMERY MECHANICS 299 



, , ^ , No. H. P. X 33,000 

 Width of belt= ^ D X No. rev. X 40 



In which 



H. P. = Horse power. 



33,000 = Number of foot-pounds in one H. P. 

 No. rev. = Number of revolutions of drive pulley 

 per minute. 

 40 = Effective tension. 

 IT = 3.1416. 

 D. = Diameter of drive pulley in feet. 



Example : What width of two-ply belting is required 

 with a drive pulley fourteen inches in diameter, making 

 three hundred revolutions per minute and developing ten 

 horse power? 



Applying our formula we have: 



Width - 10X j3,W_^^ _ ,5 i,,hes. 



Widtn _ g^^^g X 14 X 300 X 40 



Lacing Belts. In lacing belts care must be taken 

 never to cross the lacing on the side of belt next to the 

 pulley, nor to have more than a double thickness of 

 lacing. The ends of the belt should be cut off squarely 

 so as to have them come together at all points. Holes 

 are punched in a line one inch from the cut edges 

 with the outer ones within half an inch of the edge of the 

 belt. They should be just large enough to permit double 

 lacing. The lacing is best begun at the middle of the 

 belt, care being taken to have the smooth side of the lace 

 on the side of the belt that runs on the pulley. The ends 

 are fastened either by running them through small holes 

 punched in line with the lace holes, or by cutting a small 

 slit in the middle of one end, then cutting into the edge 

 and toward the end of the other, which is run through 

 the slit just beyond the cut edge. 



