BELTING TABLES 



METHOD OF USING THE BELTING TABLES 



1. Read carefully the explanation in Chapter III. 



2. Determine, from Table II, the arc of contact of the 

 belt on the smaller pulley. Subtract the diameter of the 

 smaller pulley from that of the larger. In the column under 

 " Difference in Diameter of Pulleys " corresponding to the 

 difference so obtained, read the arc of contact opposite the 

 proper center to center distance of pulleys. 



3. Ascertain from Table III the velocity of the belt in 

 feet per minute. 



4. In that portion of Table I pertaining to machine or 

 countershaft belts, as the case may be, and in the " arc of 

 contact " section most nearly corresponding to the arc of 

 contact as found above from Table II, read the horsepower 

 that will be transmitted per square inch of belt section at 

 the velocity as found from Table III. Multiply the figure 

 so found by the area of the belt as found in Table IV, to 

 ascertain the total horsepower that the belt will transmit at 

 the given speed. 



5. Opposite the horsepower as found in Table I, read the 

 maximum and minimum tensions per square inch of belt 

 section at which the belt should be operated. Multiply 

 these tensions by the area of the belt to ascertain the total 

 maximum and minimum tensions for the belt. These are 

 the figures that are to be entered on the belt-fixer's order, 

 Fig. 12, page 53. 



6. If the velocity of the belt as found from Table III is 

 intermediate to the velocities given in Table I, subtract the 



