What Causes the Squeak in Cheap Plastic Drawers?

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Discussion Overview

The discussion revolves around the phenomenon of squeaking in cheap plastic drawers, exploring the underlying causes related to friction and material interactions. Participants delve into both theoretical and practical aspects of this issue, considering comparisons to other contexts such as musical instruments.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant suggests that the squeak is related to friction, questioning why it occurs in drawers but not when running a finger down a surface.
  • Another participant proposes a model where the squeak arises from binding and break-away between similar materials, likening it to the behavior of a bow on a fiddle string.
  • A later reply inquires about the specific causes of the binding between the drawer and the cabinet, indicating a desire for deeper understanding.
  • One participant expresses uncertainty about the materials involved, suggesting that consulting experts in mechanical engineering might provide more insight into the interactions of similar versus dissimilar materials.
  • There is mention of static versus sliding friction, with a participant noting that static friction is typically greater than sliding friction, which may play a role in the squeaking phenomenon.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact causes of the squeaking. Multiple competing views and hypotheses are presented, indicating that the discussion remains unresolved.

Contextual Notes

Limitations include a lack of detailed exploration into the specific material properties of the plastics involved and the absence of empirical data to support the claims made. The discussion also does not resolve the complexities of friction at the microscopic level.

BL4CKCR4Y0NS
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Why is it that when you pull out a cheap plastic drawer, there is sometimes a squeak that makes your ears bleed? (exaggerated.)

I know it has to do with friction but why does it squeak? Or rather, what causes the squeak?

If I run my finger down a surface, there is no squeak. Even if there is it's not nearly as high-pitched...

What's the difference between the two situations?
 
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Interesting. I'm going to hazard a guess that should be similarily true of the squeak a bow causes a fiddle string.

because you have two similar materials--plastic drawer and plastic case the two materials tend to bind to each other.

The binding and break-away as you continue to pull the drawer sets up waves at the bind/break-away frequency. Binding occurs pulling the cabinet lip with it, it breaks-away oscillating in the opposite direction only to rebind when the velocites are a closest match. So I think it's the cabinet that vibrates, not the drawer. Maybe we should consult violin rosin manufactures about this.
 
Wow I didn't expect such an answer for such a simple question... nice :)

So may I ask, what is it that causes the binding of the drawer, and the cabinet?
 
BL4CKCR4Y0NS said:
Wow I didn't expect such an answer for such a simple question... nice :)

So may I ask, what is it that causes the binding of the drawer, and the cabinet?

Remember, I'm just guessing about this. But if you were to visit the mechanical engineering folder and ask about similar vs. dissimilar materials in bearing surfaces, you might get a more informed answer. For instance, it may only be that bearing and journal should be dissimilar materials if they are metal, and I'm all wrong about plastics. Or it could just be that one surface just has to be a harder metal than the other. I'm not a materials expert, so I don't know much about it.

This is also about simple friction which is a more basic physics exercise than anything, unless you look at the microscopic level. The sliding friction between two surfaces is less than the static friction.
 

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