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# lifting force in Lbs of rotational to vertical movement

## lifting force in Lbs of rotational to vertical movement

(OP)
Hello, I am relatively new to the engineering forum so please permit me some lee-way if I am asking something someone has before.

How Do I determine the lifting force in lbs of a rotational to verticle movement? I am building a simple lift with a 1 to 4 gear ratio with a 30 HP electric motor at 800rpm. It will be utilizing something similar to a piston/crankshaft setup.

Example in the picture. How do I solve for (A) ?? I have not decided on lengths or measurements for this as of yet. Any formula or advice would be a huge help.

thanks for any help

### RE: lifting force in Lbs of rotational to vertical movement

Hi

Look in a mechnics book for a slider crank linkage, basically you have a torque generated by the motor and as the cranks turns the crank rod will generate a force in the conrod dependant on its position, which in turn will produce a vertical force on the piston.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

### RE: lifting force in Lbs of rotational to vertical movement

(OP)
Thanks! I appreciate it. I'm really just trying to determine if I have a powerful enough motor attached to the assembly. I'm trying to lift 500lbs continuously.

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