Calculating Friction Force for a Waterproof Seal in a Syringe Setup

AI Thread Summary
The discussion focuses on calculating the friction force needed for a waterproof seal in a syringe setup, specifically involving a rubber piece against a container. The challenge lies in determining the necessary spring force to move the rubber about three inches. It is emphasized that the coefficient of friction cannot be calculated theoretically and must be measured experimentally. A referenced paper may provide additional insights, and it's suggested to preload the spring to ensure it maintains adequate force throughout the movement. Accurate measurement of the required force is crucial for the setup's effectiveness.
Stephen0311
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Hi Friends,

So I'll go into a bit of the setup that I'm having some trouble figuring out. I have a piece of rubber that will be pushing up against the side of a metal (or plastic) container to create a waterproof seal. The easiest way to think about this would be to imagine the rubber piece of a syringe that is pushed up and down. Basically I'm trying to determine the force I need from a spring to have that rubber interior move about three inches.

When I'm looking at the formulas for friction, all of them reference a coefficient of friction (but it's always a given in example problems). Is there a way to calculate the force of friction of the sliding waterproof seal I mentioned above?

Thanks for the help
 
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Edit: Sorry, you can't calculate the coefficient of friction. It is a quantity measured by experiment.

But I did find a paper that might help you. http://thescipub.com/PDF/ajassp.2005.626.632.pdf
 
Best bet is to measure the required force. You will need to preload the spring so it continues to generate the required force right to the end of the required travel. This means it will generate more force than needed at the start of the travel.
 

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