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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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