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The following general formula should be used for determining the actual applied
load:
L = 126,000 x HP x F x LF
WHERE L = Actual Applied Load (lbs)
N = Shaft Speed (RPM)
D = Pitch Diameter (in) of Sheave, etc.
F = Load Factor
1.0 for Chain or Gear
Drive, 1.5 for Timing Belts,
2.5 for All V Belts,
3.5 for Flat Belts
LF = 2.1 for Reciprocating Compressors and other Severe
Shock Drives and 1.8
for Large Inertia Type Drives
i.e. crushers, chippers,
planers, etc.)
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TO CALCULATE APPLICATION TORQUE:
5252 x HP/Engine RPM = Torque
Torque x Load Factor = Application Torque
Use load factor from chart below
LOAD CLASSIFICATIONS BASED UPON AGMA LOAD CHARACTERISTICS
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Uniform |
Moderate Shock |
Heavy Shock |
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Up to 3 hours per day |
1.00 |
1.25 |
1.50 |
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Electric motor |
3—10 hours per day |
1.00 |
1.25 |
1.75 |
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Over 10 hours per day |
1.25 |
1.50 |
2.00 |
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Multi-cylinder internal |
Up to 3 hours per day |
1.00 |
1.25 |
1.75 |
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combustion engine |
3—10 hours per day |
1.25 |
1.50 |
2.00 |
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Over 10 hours per day |
1.50 |
1.75 |
2.25 |
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Multi-cylinder internal
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Up to 3 hours per day |
1.50 |
1.75 |
2.25 |
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combustion engine |
3—10 hours per day |
1.75 |
2.00 |
2.50 |
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with high torque rise |
Over 10 hours per day |
2.00 |
2.25 |
2.75 |
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Single cylinder internal |
Up to 3 hours per day |
1.25 |
1.50 |
2.00 |
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combustion engine |
3—10 hours per day |
1.50 |
1.75 |
2.25 |
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Over 10 hours per day |
1.75 |
2.00 |
2.50 |
All clutch engagements to be with prime mover below 1000 RPM.
High inertia loads may require use of larger clutch.
Contact Twin Disc application engineering department for assistance.
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