TreeStuff.com Accelerated Rope Wear Testing

We also don't test ropes MBS against manufacturers listed strengths because of differences in set up and apparatus. However we are able to make a relative comparison in this case because the strength loss is so great that it eliminates the potential for our equipment and bollard mount to contaminate the data with lower results.

Short story they have a larger bollard than we do.


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Lol. There's is actually a lot bigger! We use a large round Bollard to anchor the rope on one end of the test bed at high loads the bend radius becomes the breaking point. The bollards used by most rope manufactures are much larger there by yielding a higher result.


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But in the case of this test that isn't relevant because the rope does not break at the termination or at the bollard it breaks at the wear point


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Maybe next you guys could due some prussic testing. I often wonder how much strength I lose when I am using a rigging prussic on the rope. Is the prussic still the weak point or does the rope get weaker under the friction joint.
 
Usually the prusik breaks the host line if it encounters a stopper. Otherwise it just slides. Max holding power is usually maxing at 4K


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bonner1040 said:
We also don't test ropes MBS against manufacturers listed strengths because of differences in set up and apparatus. However we are able to make a relative comparison in this case because the strength loss is so great that it eliminates the potential for our equipment and bollard mount to contaminate the data with lower results.

Short story they have a larger bollard than we do.


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How can you make a relative comparison, when you clearly state you use different apparati...thus my inquiry
 
frashdog said:
How can you make a relative comparison, when you clearly state you use different apparati...thus my inquiry
Click to expand...


Because we aren't testing for max strength of the rope. If we were testing the minimum breaking strength of a rope we would need a larger Bollard to get the highest results. But since the rope breaks at a much lower number due to the wear point the potentially lower breaking results that would e caused by a smaller bollard don't happen. Because the numbers never even get close to that point.


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bonner1040 said:
Lol. There's is actually a lot bigger! We use a large round Bollard to anchor the rope on one end of the test bed at high loads the bend radius becomes the breaking point. The bollards used by most rope manufactures are much larger there by yielding a higher result.


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Click to expand...
There in fact is a variable that needs to be addressed. Did not think of that one...thanks.
 
You can rent the break machine and an operator for $200/hour and the wear tester for $100/day and run whatever tests you deem fitting if you like?


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