Chopping 2x4 with thin edge geometry

[BluntCut MetalWorks]

For my upcoming metal sequencing research experiments, I plan to validate(via inference) undisclosed structure formation volume% within C+Fe system by this test:

Chop kiln dried Douglas Fir 2x4, 3 consecutive times, completed in less than 60 strikes total. Chopper edge geometry at 6.5 degrees per side -- 1 degree thinner angle than a standard straight razor -- and less than 0.008" behind edge thickness. Passing criteria required afterward edge still slowly slice phonebook paper without tear.

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.

 

[Oklahoma Outlaw]

Subscribed to this thread.

 

[Fir Na Tine]

video?
will be great to see.

 

[Sonnydaze]

BLUNTCUT:
Chop kiln dried Douglas Fir 2x4, 3 consecutive times, completed in less than 60 strikes total. Chopper edge geometry at 6.5 degrees per side -- 1 degree thinner angle than a standard straight razor -- and less than 0.008" behind edge thickness. Passing criteria required afterward edge still slowly slice phonebook paper without tear.


must not be anything blunt about your cut..

 

[Cobalt]

yeah, where's the video and a closeup of the edge thickness and width?

also, shouldn't this be on the review forum, were testing is done?

 

[BluntCut MetalWorks]

Searching for what's possible, especially alien's technology thus not belong in review forum. If shown possible, thereby sort-of-falsify metallurgy strength mutex toughness principle/hypothesis.

 

[Cobalt]

Searching for what's possible, especially alien's technology thus not belong in review forum. If shown possible, thereby sort-of-falsify metallurgy strength mutex toughness principle/hypothesis.

lol. ok.

I will tell you, I was sharpening one of my big knives, thinking I was putting 14-15 dps and when I measured I ended up with 8-9 dps. Haven't used it yet, it will be interesting to see how much damage I can do to it.

 

[BluntCut MetalWorks]

video?
will be great to see.

Current experiment (sequencing) is still in progress - maybe 7-12 more days to completion. In this batch, the only partial tang 7" S125V blade will give this test a try.
Next experiment planned to has a least 3 10" choppers among these steels [1095, W2, S125V, M398, V4E, ..] These are candidates for an all out attempts.

 

[BluntCut MetalWorks]

lol. ok.

I will tell you, I was sharpening one of my big knives, thinking I was putting 14-15 dps and when I measured I ended up with 8-9 dps. Haven't used it yet, it will be interesting to see how much damage I can do to it.

Please do a few gentle/tap chops to see how 8-9dps edge fare? Ideally, if existing material can pass this test, I would choose another test objective and save me time & $ as well.

 

[Cobalt]

Please do a few gentle/tap chops to see how 8-9dps edge fare? Ideally, if existing material can pass this test, I would choose another test objective and save me time & $ as well.

I was planning on doing a lot more than that to it

 

[tinfoil hat timmy]

I was planning on doing a lot more than that to it

YES

 

[Cobalt]

YES

 

[tinfoil hat timmy]

oh my.

EVEN MOOOOORE YESSSSSSS

is that a symmetrical or asymetric edge?

 

[Cobalt]

oh my.

EVEN MOOOOORE YESSSSSSS

is that a symmetrical or asymetric edge?

Symmetrical, as I put the edge on it myself. And it's been a long time since I ground the old edge away, so I don't remember what it originally was.

 

[Fir Na Tine]

Wonderful knife
looks near perfect

 

[tinfoil hat timmy]

for now

 

[BluntCut MetalWorks]

Fun to guess behind edge thickness of this edge.
Given sharpening angle ~17* inclusive, bevel at least 3mm / .118", so BET (2*hyp*SIN(radians(angle/2))) = at least .89mm / 0.035"

Cobalt - what is BET/BTE of this edge?

 

[Cobalt]

Fun to guess behind edge thickness of this edge.
Given sharpening angle ~17* inclusive, bevel at least 3mm / .118", so BET (2*hyp*SIN(radians(angle/2))) = at least .89mm / 0.035"

Cobalt - what is BET/BTE of this edge?

So thickness BTE, at the shoulder is between 0.052 and 0.054. Towards the tip it gets thicker. Middle of the blade I would say 0.053"

The sides of the edge/triangle are 0.168" near the tip to 0.172" on the sweet spot.

Again, I did this freehand, which is why I totally screwed up the target angle of 14dps. I have another blade that has a wider edge and is 14dps. But because the profile is this one is so thin, it messed me up and I thought I was getting the same rough angle of 14-15.

 

[Cobalt]

Wonderful knife
looks near perfect

for now

Not to ugly for a knife made 23 years ago. It's been my truck knife for a long time, which is why it has newer handles.

 

[BluntCut MetalWorks]

Preliminary/pilot test to see how close/far current experiment specimen able to chop 2x4 and afterward edge still slowly slice phonebook paper. Per my calculation/estimate before this test - at 7dps, there is 40% chance of a clean pass. TG15 sequence has 60+% chance - a few more days until s125v blade is ready, hopefully hardness reached above 66.5rc.

S125V 67rc, 6.5dps, 0.0038" BET sharpened with edgepro, apexed & deburred at 600 grit diamond plate.

6:08 video