Show all posts by user
Sharpening, restoration, modifications and all manner of emergency cpr as required to get her back in fighting condition.
This forum is currently read only. You can not log in or make any changes. This is a temporary situation.
S90V 65rc Chopper - 11 months ago
"S90V - Chopping blades" thread was in the back of my mind since 2016. Finally, my ht is ready for a s90v chopper. S90V 65rc, sharpened with edgepro 600 grit diamond plate at 18dps with 0.016" behind edge thickness Test at 20dps includes chopped 16d nail Soon I will make a 65rc S125V chopper going through same chopping test.by bluntcut - Say hello to my little friend!
Re: Kitchen knives blunt super quickly - 1 year ago
Your 15dps 61rc niolox seems a little prone to edge damages ... Currently I am making many niolox knives, so here is a new test video: Niolox 63rc 13dps cut bamboo and pork bone Tests *note: 15dps is 54% stronger than 13dps (volume strength = power(15/13,3) closeup of edge afterward:by bluntcut - TuneUp's
Re: Kitchen knives blunt super quickly - 1 year ago
Good, you identified cause of the problem. Out of curiosity, I pull slice carrot and twist/pry 45+ degrees sideway to detach thin cut carrot piece from blade. After 50 slices+pries, this 63rc niolox edge (12 dps, 15 dps micro) would still quietly slice phonebook paper.by bluntcut - TuneUp's
Re: Kitchen knives blunt super quickly - 1 year ago
quote: "But if I slice the knife over the cutting board 50 times with moderate pressure, the edge shows significant damage." Your board is loaded with very fine silicate/grit. Pushcutting/chopping on this board will dull too but at much slower rate. As for sometime catches when fast slicing newsprint/phonebook - probably snagged by high feed rate against a few carbide burrs or cby bluntcut - TuneUp's
Re: Spyderco raising prices again. 35% MAP. - 4 years ago
It's rust.by bluntcut - Nothing under the microscope
Re: Spyderco raising prices again. 35% MAP. - 4 years ago
Sorry about OT onto H1 rust. IIRC - I responded to h1 rust (on SF) mostly suspected rust was probably due to fish stomach acid. However after re-look at images at a bigger picture view point == main cause due to loss of corrosion and stomach acid accelerate rust rate. My new/updated guess/speculation: Spots/areas heated above 1000F loss corrosion resistance due to Cr alloyed with C to formby bluntcut - Nothing under the microscope
Re: SB1 / Niolox impressions - 4 years ago
Thus far, Z-FiNit is the only steel (i've tinkered with) my ht couldn't harden higher than 60.5rc. I also like steels can harden to higher hardness. Niolox mfg's document on hrc & grain size were discouraging but I tried anway because I thought/hope it would response similar to aebl or rwl34/cpm154. With my proprietary ht - 66rc is the highest avg hardness for niolox. Here is my ht versioby bluntcut - I am kind of a big deal.
Re: SB1 / Niolox impressions - 4 years ago
I am making a large batch of kitchen and some outdoor knives in niolox. I agree with you on niolox wear resistant is a lot higher than aebl (and 3v). My niolox test blades have better wear resistance (at same/similar hrc) than D2 but slightly less than s30v & D6. On average, it took about 4 2x72 belts to grind one 5" petty blade, which almost as bad as when working on 10V & S90V. Myby bluntcut - I am kind of a big deal.
Re: Z-FiNit? - 4 years ago
Look like it broke by tip whipping onto concrete/granite surface. From 4ft hight, hold knife with tip up at ~45 degrees. Drop with flat side down. Rotate 30* + drop. Rotate 45* + drop. Rotate 90* (spine facing surface) + drop. It sort like wrist flick/snap blade tip onto concrete/granite flat+angle and spine. This type of high impulse forces (spine down especially) would easily break all sby bluntcut - Under the hammer (or in front of the grinder)
Re: A typo ? - 5 years ago
15dps edge ~2K finished sharpening grit, whittle African Blackwood and dried cooked beef rib bone. The almost clear hard part of the bone is very challenging to whittle - apex usually damage right away by very high lateral load.by bluntcut - I am kind of a big deal.
Re: A typo ? - 5 years ago
iirc N690 data: N690 63rc/350F, 64rc/325F, 64+-peak_rc sub 300F. Niolox data avg: 64rc/350F, 64.5rc/325F,... Aebl is about -0.5rc lower than Niolox curve for temperature above 275F. QuoteJSCT Hey bluntcut, I guess You tempering your blades at quite low temperatures about 150Celsius / or 300 F ? Or am I wrong ? I saw some of your videos with tests, some bone whittling looked impreby bluntcut - I am kind of a big deal.
Re: A typo ? - 5 years ago
I never done ht for vg-10 before but for equivalent steel - N690. Hardness peak 64.5-65rc. 15dps edge at 64rc is fairly stable but failed to whittle African Blackwood and dried cooked beef rib bone. After repeated experiments for n690 - 63rc is a stable working edge. Below 62rc edge is quickly becoming mushy (easy to deform) - thus, failed whittle tests as well. For delicate kitchen knives - 63by bluntcut - I am kind of a big deal.
Re: Farid Mehr : 121 REX Mule - 5 years ago
While searching for 15V & rex121 data - found & resurrect this thread. Finally happy with my ht for rex121 & 15V and in preparation for making a couple 15V knives. Edge in pictures has no problem whittle African Blackwood. Very thin hollow ground and small sharpening bevel http://i.imgur.com/Ov8SSET.png (full size)by bluntcut - Say hello to my little friend!
Re: S90V - chopping blades : Jeremy McCullen - 5 years ago
Yes QuoteShurdi3 Also do you think the blades could handle boning a chicken?by bluntcut - Say hello to my little friend!
Re: S90V - chopping blades : Jeremy McCullen - 5 years ago
Memory recall brought me back here to check for updates & possibly harbinger data. I will make a 10V chopper, which has about the same carbide volume as s90v, except less Cr%. 10V .156" thick x 1.7" wide, 10.5" blade, 16" OAL. Target hardness around 66-68rc, 0.02" BET, 18dps. Test circuit: 2x4, 0.5 & .75" dia oak dowels. Oak dowel is murderous whenby bluntcut - Say hello to my little friend!
Re: Heat Treatment - Crystal Weaving Foundation - 5 years ago
Pick a steel - conventional ht max rc AQ edge won't survive cutting nor chopping Lignum Vitae - at all. I've done that in testing many times before. Whittle black bamboo - which is much easier - but will destroy those edge too. Done that before as well. Let's just wait and see how others use CWF ht and test their results. QuoteCliffStamp Quotebluntcut While I've shown mine 68+rc 10v & M4by bluntcut - Bro, do you even science?
Re: Heat Treatment - Crystal Weaving Foundation - 5 years ago
I will video walk through the entire CWF ht process. Summary steps. Then show step by step (obviously - I will need to cut out the waiting and repetitive times) Saturate aust matrix - whatever appropriate aust temp+soak for steel in video CWF steps - will yak about what each step supposed to do (reality may differ than what in my head) - what I think could be ideal but settle for practicalby bluntcut - Bro, do you even science?
Re: Heat Treatment - Crystal Weaving Foundation - 5 years ago
Cliff, it's this no ending proving from myself then double-blind then CI ... see I won't go down that path. If untempered 68+rc 10V/M4 don't exists out there, what there to compare with mine. Temper down to conventional max hrc = 1. adding boat load of variables. 2. not much to compare anyway because max hrc conventional ht blade are too brittle. While I've shown mine 68+rc 10v & M4 are perfby bluntcut - Bro, do you even science?
Re: Heat Treatment - Crystal Weaving Foundation - 5 years ago
Cliff, I understand and appreciate your points/views. However I'm not even trying to compare my CWF vs conventional ht. The world will replicate and compare/whatever themselves. A path of proving stuff = CWF isn't ready. Yes, I am saying - I went past that. I am counting on the world can't ignore it, once shown. Maybe it's my flea hill worth of contribution, so it is - and don't care that much.by bluntcut - Bro, do you even science?
Re: Heat Treatment - Crystal Weaving Foundation - 5 years ago
Here is a bf link - I am quite confident - a 10v or CPM-M4 at 68+rc doesn't exists anywhere in the world beside mine.by bluntcut - Bro, do you even science?
Re: Heat Treatment - Crystal Weaving Foundation - 5 years ago
Thanks, Cliff. I've so many baseline/reference blades. Also I treat hrc as macro hardness so it is there as an easy pacifier to less informed readers. In order to use/test these blades at 'Untempered' state - the matrix can't be brittle. Here is an excerp from BF post - you might appreciate about my view/hint at HRC. I think, you've used similar analogy or I swiped from you. Does everby bluntcut - Bro, do you even science?
Re: Heat Treatment - Crystal Weaving Foundation - 5 years ago
Here is my process to come up with conceptual/logical CWF 'how'. But 'how' to 'what'? So I must clearly/quantitatively define 'what' is the goal? otherwise - the whole process is like a blind squirrel looking for moon nuts - well: I contacted NASA, my chance increased by 10^-18 Graph Map an aust volume (inside a grain) as volume/3D graph, where Fe & C are vertices and inter-atomic elecby bluntcut - Bro, do you even science?
Re: Heat Treatment - Crystal Weaving Foundation - 5 years ago
*Cliff* feel free to move or delete this thread if deem inappropriate or violate forum's rules. ** While waiting for declaration period to expires. If you have time to burn, you might enjoy this 11 minutes video entertainment BCMW 20160706 cut old ironing board with 8670 steel blade at 64rc Using Crystal Weaving Foundation ht to hardened this blade. 8670 Steel, 64rc, 0.10" tby bluntcut - Bro, do you even science?
Heat Treatment - Crystal Weaving Foundation - 5 years ago
BluntCut MetalWorks heat treated steels attributes (referenced context below) are based on my Crystal Weaving Foundation(CWF). CFW has graduated into a small contribution to science. It will open a door to go outside of the current industry ht box/room - a broad area and depth to be explored by all of you. Science Freedom - details of CFW 'how' & 'why' are to be widely presented and it shoby bluntcut - Bro, do you even science?
Re: High RC 3V Chopper - 5 years ago
Done yesterdayby bluntcut - Under the hammer (or in front of the grinder)
Re: High RC 3V Chopper - 5 years ago
Each test blade has no less than 3 rockwell hardness indentor marks. I did this video because someone on BF suggestedby bluntcut - Under the hammer (or in front of the grinder)
Re: High RC 3V Chopper - 5 years ago
Thanks. QuoteLuisknivacc I'm constantly impressed by how your higher RC chooppers deform instead of breaking, good job. My yt comment/reply Instead of guessing - I went outside and: Made 10 shattered chops through frozen beef rib bone. Straight down /perpendicular chops resulted in no or micro ripple. Repeat on same edge area with rippled = micro chips, since the bend has exceeded plastiby bluntcut - Under the hammer (or in front of the grinder)
Re: High RC 3V Chopper - 5 years ago
Alright then - here is the videoby bluntcut - Under the hammer (or in front of the grinder)
Re: High RC 3V Chopper - 5 years ago
While a 15 minutes video is uploading at molasses speed. BluntCut MetalWorks 20160603 CPM 3V, 65RC, 0.156" thick x 1.9" wide, 7.5" blade, 12.5" OAL Edge thickness range: 0.014" to 0.025" (tested area ~0.02" thick) Well, it would be entertaining to hear your bet/speculation/laugh about the outcomeby bluntcut - Under the hammer (or in front of the grinder)
Re: High RC 3V Chopper - 5 years ago
I will make a 6.75" x 2" W x 0.156" thick 3V wood cleaver. 65rc is the target testing hardness. Chopping green pine with plenty of pin knots would be one of most challenging chop tests. If succeeded, then will make a chopper or 2.by bluntcut - Under the hammer (or in front of the grinder)