Screws Shaking Loose: Vibrations Explained

  • Context: High School 
  • Thread starter Thread starter Johnleprekan
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Discussion Overview

The discussion centers around the mechanisms by which vibrations can cause screws to loosen from a shelf. Participants explore various theories and explanations related to the physical interactions involved, including friction, expansion, and contraction of materials.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant suggests that screws function like two inclined planes, with friction preventing them from unwinding. They propose that constant vibration may lead to slippage, resulting in screws becoming looser.
  • Another participant introduces the idea of expansion and contraction due to sound waves affecting the material, arguing that this process can lead to screws loosening as the wood expands and contracts, potentially shifting the screw's position.
  • There is an acknowledgment of uncertainty, with one participant stating, "I could be wrong," indicating that their explanation is speculative.

Areas of Agreement / Disagreement

Participants present multiple competing views regarding the mechanisms of screw loosening due to vibrations, and the discussion remains unresolved with no consensus reached.

Contextual Notes

Participants do not fully explore the assumptions behind their claims, such as the specific conditions under which vibrations occur or the types of materials involved. There is also a lack of detailed examination of the mathematical or physical principles that might govern these interactions.

Johnleprekan
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Can anyone explain how vibrations actually shake a screw loose from a shelf? What is happening there?
 
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My suggestion !...screws are essentially 2 inclined planes wanting to slide past each other. It is only friction that prevents this happening. If there were no friction screws would have a tendency to unwind under any load at all.
I would imagine that constant vibration enables slippage to occur and this is bound to result in screws getting slacker. I have never come across vibration making screws tighten up !
 
Expansion and contraction

as the sound waves pass through the object in question it expands and contracts this action is what's turning your screw

Wood expands screw loosens up some
Then then wood contracts but the screw is in a slightly diffrent place so it becomes a question of least resistance is it easier to sheer metal into wood or turn the screw?

I could be wrong but that's my take on it
 
Thank you.
 

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