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Questions tagged [tribology]

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1answer
63 views

Approach to solve a frictional problem?

I am having a bar and surface (made of aluminum). I need to attach some material to the end of the bar so that, if I apply any force (25 N-sideways) to bar it has to stick with the surface. Force ...
0
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1answer
30 views

Power needed to accelerate metal powder through two spinning wheels

I have a wheel which has a radius of 0.1m that needs to spin at 10000RPM. The outer surface of this wheel is pressed up against another free spinning wheel like a football or tennis ball launcher. I ...
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0answers
1k views

Significance of the Sommerfeld number

The Sommerfeld number can be written as $$ S = \frac{6 \ \mu \ U \ b}{p \ c^2} $$ where U: Velocity b: Width p: Pressure c: Minimal Clearing $\mu$: Absolute Viscosity As far as I'm aware, it may ...
6
votes
1answer
342 views

What makes crosshead bearings hard to lubricate?

Regarding crosshead bearing failure, I have read that at slow speed it is difficult to establish a lubricating film because there is an imbalance between forces due to combustion and forces due to ...
3
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1answer
165 views

What's the name of the white lubricant that children's toys often use?

When I was little I would often take apart my toys and found that if they contained any gears or motors they'd always be coated in a white lubricant. What is this substance?
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3answers
592 views

Applications with combination of high friction and low wear?

What would be some common applications involving high friction and low wear rates? for example, gear-driven mechanisms which require high friction between the gear teeth but ideally low wear between ...
2
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3answers
2k views

Is there any material that has a higher kinetic friction than static friction?

Is there a material that has higher kinetic friction than static friction? You can assume it's sliding on any surface you want. Better if you come up with one that has this property on a standard ...
5
votes
1answer
356 views

Which lubricant (oil or not) to use if I want to prevent sticky/gummy buildup?

I am currently tinkering with typewriters and two things striked me when I started to read about their maintenance: They are supposed to run almost completely dry, except for a very tiny amount of ...
9
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2answers
1k views

What causes friction in magnetic bearings?

Magnetic bearings work by levitating a rotating shaft so that it is not in contact with its supports. This greatly reduces the friction of the system. In all of the literature that I have seen on ...