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• # torque by manual rotation

Discussion in 'The main mechanical design forum' started by zubair, Jun 11, 2012.

1. ### zubairMember

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Hi! Can anybody tell me please that if a human rotates some thing for example gear manually (by his hand), how high torque can it apply manually. i.e., what proportion of his weight or any thing else?

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3. ### vidgolobActive Member

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As far as I know that depends on the system that enables the rotation. I could be wrong but I think you need to be more specific if you want a better answer.

4. ### zubairMember

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thanks for your interest. Actually i want to design a manually operated gear mechanism. this shall be driven by hand rotation of screw attached to pinion. I have to put some value of torque in solidedge spur gear designer.

5. ### DanaWell-Known Member

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The torque a person can produce depends on the length of the lever (crank) arm, whether the person is pushing or pulling, whether they're standing or seated, etc.

6. ### vidgolobActive Member

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Exactly what Dana said. You need to work out your project before you start with modeling, and not the other way around.

7. ### RiteshNew Member

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Hello zubair

Average human hand can apply 100N force easily. so you can consider F=100N for your calculation.
and according to this force you can calculate Torque (T=F x R).

further this torque is also dependent on friction.

8. ### k_j0nesNew Member

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Way too many variables to consider in this example! Add a crank handle to the mechanism to eliminate some of them.

9. ### reversethrustMember

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I read in machine design by Robert Norton that a human force can provide force upto 60 lbf

10. ### RogersDNew Member

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http://www.roymech.co.uk/Useful_Tables/Human/Human_strength.html

The data on this page details the applied force (mean, range, standard deviation) for both females and males of a particular age range, for various loading scenarios (e.g. turning a circular knob, twisting a lid, etc)

If you review the related links at the bottom of the page you'll come across more detailed data covering different age ranges and more loading scenarios.

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