Coefficient of Friction for cable pulling calculations

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kenaslan

Senior Member
Location
Billings MT
The Southwire pulling software has the COF at 1.5 for a cable tray pull. This is fine if one is using new perfectly maintained rollers. But in the real world, rollers are rusty, not maintained, bent, dirty, ect. I am thinking of using a COF of 2.0, does anyone have any thought on this?

Thanks
 

junkhound

Senior Member
Location
Renton, WA
Occupation
EE, power electronics specialty
thinking of using a COF of 2.0, does anyone have any thought on this?

If you find that is true, apply for a patent, I want some of that there COF 2.0 stuff for my tires!

COF
RubberWet AsphaltClean and Dry0.25 - 0.75
RubberDry ConcreteClean and Dry0.6 - 0.85
RubberWet ConcreteClean and Dry0.45 - 0.75
 

junkhound

Senior Member
Location
Renton, WA
Occupation
EE, power electronics specialty
No idea what the southwire pulling software is, too lazy to search for it.

Since this is an 'engineering' tab, replied for simple COF physics since no one else had responded.

If there are no surfaces so rough that there is mechanical interlock (which no longer is friction), then the 1.5 is about max COF and occurs when simiar materials are in close contact. For instance, nylon wires against other nylon, the static friction can be close to 1.5 due to Van der Walls forces if the nylon has been sitting against other nylon in warm temperatures. (or poly against poly, etc)
 
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