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Want to know what is the best in terms of friction 
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#1
Jun2713, 03:39 PM

P: 6

i want to use a 100 cm diameter piston witch will have 4000 kg of pressure on it.
Questions how thick does the piston have to be to hold that much weight if it is made of metal? what material should i use to make a seal to the cylinder wall and should the cylinder wall be another material then metal? what is the static friction on the cylinder wall and seal if lubricated? thank you for your time 


#2
Jun2713, 04:46 PM

Mentor
P: 11,837

4000kg is not a pressure, it is a mass.



#3
Jun2713, 05:31 PM

P: 124

http://en.wikipedia.org/wiki/Frictio...ts_of_friction has some static friction coefficient values for lubricated steel on steel. I would not trust these values for any serious work though.
The coefficient of static friction gives you an approximation of static friction as a portion of the normal force. The normal force is basically how hard your surfaces are pressing against each other. 


#4
Jun2913, 10:42 AM

P: 6

Want to know what is the best in terms of friction
What i want to do is have a cylinder that is made of steel (don't know what types there are but i guess regular)
with a height of 20 ft or so, filled with water. for the bottom of the cylinder i want a piston that would move 6 inches. the volume of the water on top of the piston is about 4000 liters i was wandering if you could tell me how thick the steel would have to be so that it would support that weight. 


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