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How do you calculate the amount of torque you need to pull an object?

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HI guys, I am trying to build a pulley with a gear box.

So I want my pulley, which is operate by a 3V DC motor with max speed of 8300 RPM.
I think the size of the output shaft is 3mm

Ok, so Can someone help me with how to calculate the original amount of torque I can get out of this motor?

and let say the I can connect the shaft to a gearbox with ratio of 300 to 1.

Will I be able to pull about 10 lbs with this gear ratio?
Assuming I am pulling it over flat surface?

Thanks alot.

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