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Moment of Inertia of screw drive.

Moment of Inertia of screw drive.

Moment of Inertia of screw drive.

(OP)
Can anyone help me calculate the polar moment of inertia of a screw based transmission shaft?  I'm trying to calculate the size of the screw I will need to transmit a certain amount of power.  Thanks

RE: Moment of Inertia of screw drive.

Polar moment of inertia for a shaft is equal to twice the moment of inertia, or 0.098 D^4.

RE: Moment of Inertia of screw drive.

(OP)
But because it is a screw, the diameter is different depending on where I take the cross section.  Doesn't that make a difference?  Which diameter do I take?

RE: Moment of Inertia of screw drive.

The smallest one.

RE: Moment of Inertia of screw drive.

(OP)
Yes, that is very useful, thank you.

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