PowerGrip® GT® Belt Drives

Useful Formulas and Calculations
Polyflex ® JB ® Belt
Tension
Effective Pull
T T - T S = 33,000 (
hp
) = T e
V
Where: T T = Tight side tension, pounds
T S = Slack side tension, pounds
hp = Design horsepower
V = Belt speed, feet per minute
T e = Effective tension, pounds
T T + T S = 33,000 (2.5 - G) (
hp
)
GV
Where: T T = Tight side tension, pounds
T S = Slack side tension, pounds
hp = Design horsepower
V = Belt speed, feet per minute
G = Arc of contact correction factor (Table
25, Page 72)
T T / T S = 1
1 - 0.8G (Also, T T / T S = e K )
Where: T T = Tight side tension, pounds
T S = Slack side tension, pounds
G = Arc of contact correction factor
(Table 25, Page 72)
e = Base of natural logarithms
K = .51230, a constant for V-belt drive
design
= Arc of contact in radians
T T = 41,250 (
hp
) GV
Where: TT = Tight side tension, pounds
hp = Design horsepower
V = Belt speed, feet per minute
G = Arc of contact correction factor
(Table 25, Page 72)
T S = 33,000 (1.25 - G) (
hp
) GV
Where: T S = Slack side tension, pounds
hp = Design horsepower
V = Belt speed, feet per minute
G = Arc of contact correction factor
(Table 25, Page 72)
Micro-V ® Belt
Tension
Effective Pull
T T - T S = 33,000 (
hp
) = T e
V
Where: T T = Tight side tension, pounds
T S = Slack side tension, pounds
hp = Design horsepower
V = Belt speed, feet per minute
T e = Effective tension, pounds
T T + T S = 33,000 (2.67 - G) (
hp
)
GV
Where: T T = Tight side tension, pounds
T S = Slack side tension, pounds
hp = Design horsepower
V = Belt speed, feet per minute
G = Arc of contact correction factor (Table
25, Page 72)
T T / T S = 1
1 - 0.75G (Also, T T / T S = e K )
Where: T T = Tight side tension, pounds
T S = Slack side tension, pounds
G = Arc of contact correction factor
(Table 25, Page 72)
e = Base of natural logarithms
K = .44127, a constant for Micro-V drive
design
= Arc of contact in radians
T T = 44,000 (
hp
) GV
Where: TT = Tight side tension, pounds
hp = Design horsepower
V = Belt speed, feet per minute
G = Arc of contact correction factor
(Table 25, Page 72)
T S = 33,000 (1.33 - G) (
hp
) GV
Where: TS = Slack side tension, pounds
hp = Design horsepower
V = Belt speed, feet per minute
G = Arc of contact correction factor
(Table 25, Page 72)
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