Chopping 2x4 with thin edge geometry

Cobalt said:
FXwVRG4.jpg
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Wonderful knife
looks near perfect
 
I love your tests. Stating the obvious… Axes clear the chips because of the thickness of the edge and convex shape. this is not clearing the chips due to the thin BTE and the angle it seems. It does lack mass obviously so maybe a machete length blade might be a better test? Thank you so much for your tests. They are quite illuminating and thought provoking.
 
steel with really high toughness should hold up well to this extreme test... it seems much too thin unless intended only for food prep

cpm-3v & aeb-l & magnacut should be near top of list....
s90v and s110 etc I imagine will be too brittle given how thin the spec is
 
dirc said:
steel with really high toughness should hold up well to this extreme test... it seems much too thin unless intended only for food prep

cpm-3v & aeb-l & magnacut should be near top of list....
s90v and s110 etc I imagine will be too brittle given how thin the spec is
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3v, aebl, magnacut, etc... 63-64rc with 6.5dps edge would roll/deform on 1st chop and quickly collapse on subsequent chops.

This test is my logical next objective based on recent experimentations, especially the most recent:

9MkHysb.jpg


So chosen steels for upcoming experiments would be: m398, s125v, 15v, D6, 1095, W2, .. all with hardness at least 66rc.
 
bluntcut said:
m398
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that is honestly one of the worst toughness steels possible... I would be surprised if it didn't chip out immediately if you make it as thin as you say...
it does not even reach 5 ft-lbs
knifesteelnerds.com

M398 Steel Testing - Edge Retention, Toughness, and More - Knife Steel Nerds

M398 is a new high edge retention stainless steel from Bohler. I tested edge retention, toughness, and more to see how it compares.
knifesteelnerds.com knifesteelnerds.com

of the others you listed, none have really high toughness either, so I don't expect they will hold up to 60 chops into a 2x4
of course, I look forward to your results :)
 
Also, one thing to keep in mind is variations from board to board. I have had two boards in a row have completely different properties. I had one board be very hard and the next was normal. So sometimes it's better to use a 2x6 and use the same board for several knives. if possible. If the differences are close between knives, then the board variation could easily be that difference.
 
dirc said:
that is honestly one of the worst toughness steels possible... I would be surprised if it didn't chip out immediately if you make it as thin as you say...
it does not even reach 5 ft-lbs
knifesteelnerds.com

M398 Steel Testing - Edge Retention, Toughness, and More - Knife Steel Nerds

M398 is a new high edge retention stainless steel from Bohler. I tested edge retention, toughness, and more to see how it compares.
knifesteelnerds.com knifesteelnerds.com

of the others you listed, none have really high toughness either, so I don't expect they will hold up to 60 chops into a 2x4
of course, I look forward to your results :)
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Actually S125V is the worst on that chart - perhaps only applicable to conventional HT. The pic of experiment results above disagreed to chart extrapolated generalized toughness based on charpy-test. If you didn't watch the video above, please do. A real demonstration/evidence/show worth 1000 'tells'.

Worth repeating
AFAIK, currently there is no material can make into a chopper which capable of passing this test. However I don't know what I don't know, hence would like to learn if otherwise. For anyone willing to try this test now until Oct 31st, 1st person video demonstrated of success and send chopper to me for validation. If confirmed, will win/get $500 (pp transfer) as a bonus on top of fun trying.
 
Cobalt said:
Also, one thing to keep in mind is variations from board to board. I have had two boards in a row have completely different properties. I had one board be very hard and the next was normal. So sometimes it's better to use a 2x6 and use the same board for several knives. if possible. If the differences are close between knives, then the board variation could easily be that difference.
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Agreed, there are variation board to board. 2x6 is 50-60% wider than 2x4, which probably double the chop-strikes/counts due to larger V and chips clearance.

So perhaps using 3 different new board *fresh purchased from hdepot* when video test. 2x4 in video above is at least 6 years old - quite seasoned and tough, as you can see very little crack/flake away. A fresh kiln dried board is less tough and less binding as well.
 
WHY?
What does/will it "prove"?
Why chop a 2x4 a knife? There are tools designed to cut a 2x4, that are a lot faster (and easier on you) than chopping a daNg 2x4 in half with a knife.
Are you going to build something with 2x4's and chop them to size with a knife? In over 60 years, I've never known someone to do that.
Oh, one of my grandfathers was a carpenter, and several friends in High School became such.
In Vocational Woodshop the class project is/was build a house* and sell it at a profit at the end of the school year.
*I don't know if that school district still offers the wood, metal, machining, welding, auto repair, and drafting regular and vocational (advanced) shop classes
 
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afishhunter said:
WHY?
What does/will it "prove"?
Why chop a 2x4 a knife? There are tools designed to cut a 2x4, that are a lot faster (and easier on you) than chopping a daNg 2x4 in half with a knife.
Are you going to build something with 2x4's and chop them to size with a knife? In over 60 years, I've never known someone to do that.
Oh, one of my grandfathers was a carpenter, and several friends in High School became such.
In Vocational Woodshop the class project is/was build a house* and sell it at a profit at the end of the school year.
*I don't know if that school district still offers the wood, metal, machining, welding, auto repair, and drafting regular and vocational (advanced) shop classes
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Advancement in Material.
 
Did you try your 26C3 yet, that's the best steel I work with currently. If your Spicy white couldn't do it then I can't do better than that.
 
Londinium Armoury said:
Did you try your 26C3 yet, that's the best steel I work with currently. If your Spicy white couldn't do it then I can't do better than that.
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See post #26. I would try 26C3 if my sequencing able to yield above 66.5rc (no luck thus far). I plan to try 1095 & W2, which aim for 67+rc.
 
afishhunter said:
WHY?
What does/will it "prove"?
Why chop a 2x4 a knife? There are tools designed to cut a 2x4, that are a lot faster (and easier on you) than chopping a daNg 2x4 in half with a knife.
Are you going to build something with 2x4's and chop them to size with a knife? In over 60 years, I've never known someone to do that.
Oh, one of my grandfathers was a carpenter, and several friends in High School became such.
In Vocational Woodshop the class project is/was build a house* and sell it at a profit at the end of the school year.
*I don't know if that school district still offers the wood, metal, machining, welding, auto repair, and drafting regular and vocational (advanced) shop classes
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"Why?" is a fun question in this hobby. It can have answers like "for science", "because we can", or "we had too many sodas".
 
afishhunter said:
WHY?
What does/will it "prove"?
Why chop a 2x4 a knife? There are tools designed to cut a 2x4, that are a lot faster (and easier on you) than chopping a daNg 2x4 in half with a knife.
Are you going to build something with 2x4's and chop them to size with a knife? In over 60 years, I've never known someone to do that.
Oh, one of my grandfathers was a carpenter, and several friends in High School became such.
In Vocational Woodshop the class project is/was build a house* and sell it at a profit at the end of the school year.
*I don't know if that school district still offers the wood, metal, machining, welding, auto repair, and drafting regular and vocational (advanced) shop classes
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If you can make an extremely thin knife blade that still resists impact damage, I would think that would make for a pretty good fillet knife.
 
Take II of preliminary/pilot chopping 2x4 with 6.5dps edge. Chopped through 3 times.

5:05 video

hYkv4cQ.jpg


If current sequencing - MS TF0_SBF1_3DTG15 - finished and produced proper result, I will use a 7" s125v 67rc (so far) blade to take this test. Also preparing 4 chopper blades (s125v, s90v, cpm154, m98) for next sequencing MS TF0_SBF1_3DTG23.
 
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