10-21-2020, 09:57 PM
So I watched some videos of guys doing edge retention testing with rope. You're right Mr. subwoofer, they all cut against a cutting board!
That seems highly problematic to me, considering the wood is much harder than the rope. In many of the videos a "whack" can be heard as the knife impacts the wood, and a lot of pressure is used when slicing against the board. I would think that impact would actually have more dulling effect than the rope.
It's easy to show the dulling of wood impact on an edge. Sharpen a knife and measure the sharpness. Whack it a few times on a cutting board and do some slicing against the wood. Measure sharpness again. It doesn't take much to roll and edge!
In this video, you can hear the knife impacting the cutting board when the dude slices the rope: https://www.youtube.com/watch?v=C2CaE7pNe1M
It would seem to me that when devising a rope edge retention test, it would be advisable to construct it to avoid contact with any material other than the rope.
That seems highly problematic to me, considering the wood is much harder than the rope. In many of the videos a "whack" can be heard as the knife impacts the wood, and a lot of pressure is used when slicing against the board. I would think that impact would actually have more dulling effect than the rope.
It's easy to show the dulling of wood impact on an edge. Sharpen a knife and measure the sharpness. Whack it a few times on a cutting board and do some slicing against the wood. Measure sharpness again. It doesn't take much to roll and edge!
In this video, you can hear the knife impacting the cutting board when the dude slices the rope: https://www.youtube.com/watch?v=C2CaE7pNe1M
It would seem to me that when devising a rope edge retention test, it would be advisable to construct it to avoid contact with any material other than the rope.