DESIGN WORKSHEET LAYOUT
DEPARTMENT:
NAME OF DESIGNER:
NAME OF DESIGN ACTIVITY:
START DATE
COMPLETION DATE:
ENGINEERING__________
JOHN BRYAN P. LORETO_
RUBBER BELT DESIGN___
DECEMBER 2022_______
DECEMBER 17, 2022____
A. DESICRIPTION:
Design Sheet No.: 1
Standards Adopted:
B. SKETCH/SCHEMATIC DIAGRAM.
A 5-ply rubber belt transmits 20 horsepower to drive a mine fan. An 8-in.,
motor pulley turns 1150 rpm; D2 = 36 in., fan pulley; C = 23 ft.
(a) Design a rubber belt to suit these conditions, using a net belt pull as
recommended in §17.15, Faires Text.
(b) Actually, a 9-in., 5-ply Goodrich high-flex rubber belt was used. What
are the indications for a good life? Explain your answer.
C. FORMULAS
Formulas from Faires 17.15
ϴ = π-2 arcsin (D2-D1/2C)
V = (πN1D1)/12
b = (hp)*(2400)/(vm)*(Np)
D. CALCULATIONS
E. CONCLUSIONS AND RECOMMENDATIONS
The 5-ply rubber belt transmits 20 horsepower, has a computed belt
width of 3.99 inches, and is estimated to be 5 inches. A 9-inch, 5-ply
Goodrich high-flex rubber belt that was used is suitable for a good life.
F. REFERENCES/SOURCES OF DATA
1. Design of Machine Elements ‘Fourth Edition’ by Virgil Moring Faires
DESIGN WORKSHEET LAYOUT
DEPARTMENT:
NAME OF DESIGNER:
NAME OF DESIGN ACTIVITY:
START DATE
COMPLETION DATE:
ENGINEERING__________
JOHN BRYAN P. LORETO_
RUBBER BELT DESIGN___
DECEMBER 2022_______
DECEMBER 17, 2022____
A. DESICRIPTION:
Design Sheet No.: 2
Standards Adopted:
B. SKETCH/SCHEMATIC DIAGRAM.
A 20-in., 10-ply rubber belt transmits power from a 300-hp motor, running
at 650 rpm, to an ore crusher. The center distance between the 33-in.
motor pulley and the 108-in. driven pulley is 18 ft. The motor and crusher
are so located that the belt must operate at an angle 75 deg. with the
horizontal. What is the overload capacity of this belt if the rated capacity
is as defined in §17.15, Faires Text?
C. FORMULAS
Formulas from Faires 17.15
vm = πD1N1/12
hp = (b*vm*Np)/2400
Overload Capacity = ((P2 - P1)/P1) * 100
D. CALCULATIONS
E. CONCLUSIONS AND RECOMMENDATIONS
A 20-in., 10-ply rubber belt transmits power from a 300-hp motor and has
an overload capacity of 55.99% or approximately 56%.
F. REFERENCES/SOURCES OF DATA
1. Design of Machine Elements ‘Fourth Edition’ by Virgil Moring Faires