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Summary:
 calculation of lead screw moment inertia with weight
Main Question or Discussion Point
In order to choose a DC motor according to the article titled: APPYING MOTORS IN LINEAR MOTION APPLICATION by PITTMAN 
step 4 : "determine the total reflected inertia (Jt) back from the load to lead screw shaft " .
The formula is: Jt = Jscrew + Jload.
This calculation relies on the fact that the load moves on a power screw  see the attached schema  in Scheme # 2.
My system is different and the number in the schema is # 1
The load is located at distance L, on both sides of the center of the screw.
My request: How do you calculate the load inertia in this situation?
step 4 : "determine the total reflected inertia (Jt) back from the load to lead screw shaft " .
The formula is: Jt = Jscrew + Jload.
This calculation relies on the fact that the load moves on a power screw  see the attached schema  in Scheme # 2.
My system is different and the number in the schema is # 1
The load is located at distance L, on both sides of the center of the screw.
My request: How do you calculate the load inertia in this situation?
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