Ergonomics - Human Hand - Maximum force - Wheel/Flywheel - Help ASAP :)

M

mitch37

#1
Hi guys..let me keep this short

I am looking for the maximum force a human hand can exert (perhaps speed aswell) while turning a wheel/chainwheel.

Just helping out one of my friends who is a mechanical engineer, and i am an industrial engineer, but havent come across this particular ergonomic figure:thanx:
 

Pancho

wikineer
Super Moderator
#5
According to The Measure of Man and Woman, on hand-wheels for vehicles, valves or tools, the optimum ergonomic rim force to require is 3 to 5 lbs (13 to 22N). The maximum rim force is 20 lbs (89N) with one hand and 30 lbs (133 N) with two hands.

Wheel diameter should be between 7" (178mm) and 21" (533mm).
Rim diameter should be between 0.75" (19mm) and 1.125" (28mm).

You should recess the hub for safety.

(Luv this book. :D)

Good luck!
Pancho
 
M

mitch37

#7
thanks so much for the effort...the lady who asked me figured something out but i will forward her these details :):)
 

Pancho

wikineer
Super Moderator
#8
Wouldn't it depend upon the human?
Yes, it does. The book explains that its measurements accommodate the 98% of the US not-disabled population between the 1 percentile and the 99 percentile (pg. 11).

I think that for "Maximum Force" the values given are such that 99% of the population can overcome them to operate the wheel.
 

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