PACIFIC CONVEYORS LTD.
STANDARD PRODUCT CATALOGUE
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Technical Page 7  HORSEPOWER CALCULATIONS  
FOR LINE SHAFT DRIVEN ROLLER CONVEYORS
Line shaft roll center selection, and horsepower calculation is complicated by the fact that each drive belt only delivers 0.75 lbs of pull. This means that, even though nominal roll capacity is 300 lbs, each roll will move only 15 lbs.  Increasing power beyond this value will result in increased belt slippage, but  no greater carrying capacity.
Line shaft is a clean, quiet, inexpensive, and versatile conveyor, but we recommend that you have an experienced estimator check your selection.
Formula
Model 738LS light duty PRODUCT WEIGHT (1) (lbs) Total weight of product on conveyor
Model 796LS medium duty + ROLL WEIGHT (lbs) weights and tables
  + LINE SHAFT WEIGHT 3 lbs per foot
+ DRIVE WEIGHT (lbs) Best estimate  (for small drives, use 250 lbs)
= SUBTOTAL (1) (lbs)  
x  FRICTION FACTOR (1) Belt driven live roller  0.10  weights and tables
= SUBTOTAL (1) (lbs) BELT PULL DUE TO PRODUCT IN MOTION
PRODUCT WEIGHT (2) (lbs) Portion of weight of product to be accumulated
x FRICTION FACTOR (2) Equivalent to belt on steel slider tread (0.3)
= SUBTOTAL (2) (lbs) BELT PULL DUE TO ACCUMULATED PRODUCT
(not to exceed 0.75 lbs per roll)
Model 738LSC light duty curve  
Model 796LSC curve module + SUBTOTAL (1) (lbs) Calculated in previous lines
Model 796LSS spur module = TOTAL BELT PULL (lbs) TOTAL REQUIRED BELT PULL
Model 796LSG gate module x BELT SPEED (fpm)  
Model 796LSRBT transfer = WORK RATE (ft lbs/min) NOMINAL WORK RATE
Do not accumulate on line shaft
driven curves
x 1.25 contingency Contingency allowance for drive inefficiencies
x 1.25 contingency Contingency allowance for occasional overloads
divide by 33,000 (one horsepower = 33,000 ft lbs per minute

DOWNLOAD CALCULATOR = HORSE POWER ENERGY REQUIREMENT  1HP = 0.75 kw
  must have Excel on your device * Treat all slave driven curves and spurs as one 10'0" section
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