Posted: 12/7/2006 11:33:50 AM EDT
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Does anyone know the minimum recommended mechanical advantge is for a hand tool such as a pair of pliers? Any documentation would help also. I've been trying to search ergonimic stuff on OSHAs website but can't find anything. |
Fool. Everyone knows the answer is always and forever.... 42. I agree with your response after that nonsensical number however. Takes more force to grab a screw you dropped than to tear a screwhead off for example. |
I realize this, but a 24" wrench is usually used on a larger bolt/nut that is tighter so the overall ratio is the same. |
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Negative. It appears that what you are looking for is the maximum FORCE that a human has to use to operate the tool. That probably does have guidelines, say for exmple, a human should have to exert no more than 20lbf using such and such a movement of his arm. Using that number you could calculate the required mechanical advantage of a tool for its intended application. Force applied by user multiplied by mechanical advantage of tool equals force exerted on workpiece.
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Wouldn't the "minimum number" depend on what the tool is? Or are you suggesting OSHA actually has a minimum number and you are trying to comply with it? I guess I don't quite get what you are asking... rephrase your question. |
It would depend on the invidvidual design of each individual tool, yes. |
I know how to calculate the numbers.  I know how much force can be applied by the human hand. It is 100 pounds for a man. |
