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Post by Lancelot Chan on Aug 2, 2022 16:56:47 GMT
Comparing DMT EEF 3 micron produced edge and EF 9 micron produced edge on fabric over foam. The EEF edge slices very good in the first cut, but performance drops significantly on the second cut, and had difficulty on the third cut, while the EF edge kepts its performance consistence over the 3 cuts. It has to do with micro serration. Both edges did not cut the fabric just by pushing on it and slicing action was necessary.
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pgandy
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Post by pgandy on Aug 2, 2022 17:39:21 GMT
That was a surprise ending after the first cut. Any idea of the hardness of the harness of the EEF blade?
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Post by Lancelot Chan on Aug 2, 2022 19:34:14 GMT
That was a surprise ending after the first cut. Any idea of the hardness of the harness of the EEF blade? It's 58 HRC. The EF one is 65 HRC. However I've put EEF on the box cutter before too and it lost its supreme sharpness very quick also. Not in a single cut, but like 3 cuts. I've seen some tests done by machine on cutting cards, and the result totally echo my experience here. The very fine edge does very well initially, but lose the bite right away since the micro serration is gone. The very coarse edge overall last way longer but does not cut as good initially. Here you are: knifesteelnerds.com/2018/06/18/maximizing-edge-retention/So I think a good balance is obtainable on the EF edge. Good for both slicing and chop cuts, and last long enough for a battle to come to closure, such as the user getting killed, LOL!
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pgandy
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Post by pgandy on Aug 2, 2022 20:30:26 GMT
I love your final conclusion. LMAO That’s an interesting testing machine, the first I’ve seen. Attachments:
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Post by Lancelot Chan on Aug 3, 2022 5:56:48 GMT
I love your final conclusion. LMAO That’s an interesting testing machine, the first I’ve seen. LOL, yes, battle usage is different from tools usage. One doesn't have to look for "longevity" in battle since most likely the user (me) is gonna get killed way earlier than the weapon failed.
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pgandy
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Post by pgandy on Aug 3, 2022 12:19:47 GMT
Sorry about the photos. I had a comment about changing the edge on two more machetes from 25 to 22½° as a follow up to a previous conversation and then decided it was too much and might be considered high jacking and deleted that part. It looks like I missed the photos.
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Post by Lancelot Chan on Aug 3, 2022 12:48:59 GMT
Sorry about the photos. I had a comment about changing the edge on two more machetes from 25 to 22½° as a follow up to a previous conversation and then decided it was too much and might be considered high jacking and deleted that part. It looks like I missed the photos. It's fine. :D Well if you have to put your wife's ground hitting into consideration, what you did was totally correct.
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Post by Lancelot Chan on Aug 3, 2022 15:19:16 GMT
DMT fine's edge, cuts like extra extra fine's first cut, but can keep on doing it without dropping performance.
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pgandy
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Post by pgandy on Aug 3, 2022 17:24:09 GMT
That's about my findings and why I stopped with the course belt for my machetes. That was included in the deleted part of my message above. That mouth wash bottle was cut with a machete with course grind. The machete went through the top, mouth, before passing through the body. IIRC the bottom part remained on the cutting board. I am still testing but I think the target makes a difference as to the best type of edge in all aspects.
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Post by Lancelot Chan on Aug 3, 2022 18:08:37 GMT
That's about my findings and why I stopped with the course belt for my machetes. That was included in the deleted part of my message above. That mouth wash bottle was cut with a machete with course grind. The machete went through the top, mouth, before passing through the body. IIRC the bottom part remained on the cutting board. I am still testing but I think the target makes a difference as to the best type of edge in all aspects. yes indeed. If going for realistic target (clothes, flesh, skin, muscles.... etc.) one doesn't go that fine an edge since you want the micro serration to do the job. I dunno about going through living bones though. But since living bone is comparable to some soft wood and green bamboo, I think ur coarse grind machete still excels on them, which meant one really dun have to go to the finest grit for that.
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Post by Lancelot Chan on Aug 3, 2022 20:17:25 GMT
Further test on DMT F and EF edge on "living bone like" subject, PPR pipe. The cuts were performed with slicing motion, with the same blade length. The EF edge cuts deeper, and sliced easier, while the drag with F edge is higher and did not cut as deep. So the F edge works best on soft target while the EF works best on hard the target.
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pgandy
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Post by pgandy on Aug 3, 2022 21:41:41 GMT
From above “I am still testing but I think the target makes a difference as to the best type of edge in all aspects.” It looks like some kind of agreement there.
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