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Use these equations and calculator to determine the Inertia of a
lead screw / worm gear drive system. 
Worm Gear / Lead Screw Drive System
Equation:
Motor Speed:
Load Torque Reflected to Motor:
Friction Force:
Friction Torque:
Total Inertia
Where:
| Sm = |
Motor Speed, rpm |
|
Vl = |
Load Speed, inches/minute |
|
P = |
Pitch, rev/in |
|
Tr = |
Torque reflected to motor, lb-in |
|
Fl = |
Load force, lb |
|
e = |
Efficiency |
|
Fpf = |
Preload Force, lb |
 = |
Coefficient of friction of screw |
|
Ff = |
Friction force, lb |
|
W = |
Weight, lb |
|
Tf = |
Friction torque. lb-in |
|
Jl = |
Load inertia, lb-in-sec2 |
|
g = |
Gravitational constant, 386 in/sec2 |
|
Jls = |
Worm gear / lead screw inertia, lb-in-sec2 |
|
Jm = |
Motor inertia, lb-in-sec2 |
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