Car Jack Torque Calculation - 100kg

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SUMMARY

The discussion focuses on calculating the torque required for a scissors jack designed to lift a load of 100kg. The key steps include selecting a typical screw pitch used in scissor jacks and determining the gear ratio based on this pitch. Initially, the torque calculation should assume zero friction in the screw mechanism, followed by an adjustment to include friction from lubrication. It is also recommended to incorporate a gearbox output for the electric motor to optimize performance.

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Mechanical engineers, product designers, and hobbyists involved in the design and optimization of lifting mechanisms, particularly those utilizing scissors jacks.

akueddy
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hi,

i am designing an electrical car jack, my question is before i choose the proper electric motor, how do i calculate the torque require to lift the load, let say 100kg.
 
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ops sorry, it is suppose to be a scissors jack.
 
Start off assuming zero friction in the screw mechanism, and decide what pitch screw you will use. You should probably stay with the typical screws found in normal scissor jacks to start. Then figure out the gear ratio that you get via the pitch of the screw and how that moves the scissors.

Once you've found the zero-friction torque required, go back and add in the friction term (assuming lubrication on the screw) to see how much that adds to the required torque. Your electric motor should probably also have a gearbox output, I would think.
 

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