- 21
- 67 580
Steel Drake
เข้าร่วมเมื่อ 1 ธ.ค. 2015
Sharpening tutorials, short demonstrations of techniques or concepts, and the occasional stupid sharpening trick.
AlOx and SiC vs. Vanadium - Part 8: DMT EEF Retest on Bamboo
The purpose of this video was to empirically test whether sharpening high carbide volume, high hardness steels on aluminium oxide abrasives--which are theoretically unable to abrade the vanadium carbides in the steel--results in an inferior initial sharpness and apex strength relative to sharpening those same steels on CBN or diamond abrasives.
The knife used in the test is a Spyderco Mule Team in Maxamet at ~68 HRC. For those who are unaware, Maxamet is possibly the single most extreme high hardness, high carbide volume steels currently available and its application in knife making remains in the experimental stage. As far as I am aware, the Spyderco Mule Team in Maxamet is the first production knife offered in this steel. The knife has an edge bevel angle of ~15-16 degrees per side with no microbevel.
The test procedure, developed in discussion with proponents of this proposition, was to sharpen the knife to the test grit, test the initial sharpness, and a number of hard cuts into bamboo chopsticks to test the apex strength. The pushcutting sharpness of the apex was frequently re-checked by making crossgrain pushcuts into newsprint, only stopping once there had been a noticeable degradation in that pushcutting sharpness.
For this test, I deliberately induced some convexing into the DMT EEF apex, aiming to convex the apex to ~17-17.5 degrees per side, to allay any concerns that the Spyderco M may have had an advantage due to some convexing of the apex appearing to have occured under microscopic examination. I will note here that the diagnosis that the Spyderco M apex was ~17.5 degrees per side as opposed to the ~15 degrees per side of the original DMT EEF bamboo test was done by eye, by guessing, by a proponent of the hypothesis that high hardness, high vanadium content steels suffer negative side effects from being sharpened on aluminium oxide or silicon carbide abrasives.
The results of comparing apexes set on a DMT EEF deliberately convexed to ~17.5 degrees per side and Spyderco M in bamboo cutting were as follows:
There was no noticeable difference in the initial sharpness obtained off either abrasive. Both apexes were able to cleanly and easily do crossgrain pushcuts on newsprint at all points along the apex.
There was no noticeable difference in the apex strength obtained off either abrasive. Both apexes suffered comparable amounts and extents of microscopic apex chipping after doing similar amounts of hard cutting into bamboo chopsticks.
This additional test therefore still failed to produce any evidence to support the hypothesis that any noticeable negative side effects are produced on high hardness, high vanadium content steels from being sharpened on aluminium oxide or silicon carbide abrasives.
The knife used in the test is a Spyderco Mule Team in Maxamet at ~68 HRC. For those who are unaware, Maxamet is possibly the single most extreme high hardness, high carbide volume steels currently available and its application in knife making remains in the experimental stage. As far as I am aware, the Spyderco Mule Team in Maxamet is the first production knife offered in this steel. The knife has an edge bevel angle of ~15-16 degrees per side with no microbevel.
The test procedure, developed in discussion with proponents of this proposition, was to sharpen the knife to the test grit, test the initial sharpness, and a number of hard cuts into bamboo chopsticks to test the apex strength. The pushcutting sharpness of the apex was frequently re-checked by making crossgrain pushcuts into newsprint, only stopping once there had been a noticeable degradation in that pushcutting sharpness.
For this test, I deliberately induced some convexing into the DMT EEF apex, aiming to convex the apex to ~17-17.5 degrees per side, to allay any concerns that the Spyderco M may have had an advantage due to some convexing of the apex appearing to have occured under microscopic examination. I will note here that the diagnosis that the Spyderco M apex was ~17.5 degrees per side as opposed to the ~15 degrees per side of the original DMT EEF bamboo test was done by eye, by guessing, by a proponent of the hypothesis that high hardness, high vanadium content steels suffer negative side effects from being sharpened on aluminium oxide or silicon carbide abrasives.
The results of comparing apexes set on a DMT EEF deliberately convexed to ~17.5 degrees per side and Spyderco M in bamboo cutting were as follows:
There was no noticeable difference in the initial sharpness obtained off either abrasive. Both apexes were able to cleanly and easily do crossgrain pushcuts on newsprint at all points along the apex.
There was no noticeable difference in the apex strength obtained off either abrasive. Both apexes suffered comparable amounts and extents of microscopic apex chipping after doing similar amounts of hard cutting into bamboo chopsticks.
This additional test therefore still failed to produce any evidence to support the hypothesis that any noticeable negative side effects are produced on high hardness, high vanadium content steels from being sharpened on aluminium oxide or silicon carbide abrasives.
มุมมอง: 702
วีดีโอ
AlOx and SiC vs. Vanadium - Part 7: Spyderco M Bamboo Cutting
มุมมอง 4418 ปีที่แล้ว
The purpose of this video was to empirically test whether sharpening high carbide volume, high hardness steels on aluminium oxide abrasives which are theoretically unable to abrade the vanadium carbides in the steel results in an inferior initial sharpness and apex strength relative to sharpening those same steels on CBN or diamond abrasives. The knife used in the test is a Spyderco Mule Team i...
AlOx and SiC vs. Vanadium - Part 6: DMT EEF Bamboo Cutting
มุมมอง 3488 ปีที่แล้ว
The purpose of this video was to empirically test whether sharpening high carbide volume, high hardness steels on aluminium oxide abrasives which are theoretically unable to abrade the vanadium carbides in the steel results in an inferior initial sharpness and apex strength relative to sharpening those same steels on CBN or diamond abrasives. The knife used in the test is a Spyderco Mule Team i...
AlOx and SiC vs. Vanadium - Part 2: DMT EEF
มุมมอง 6668 ปีที่แล้ว
The purpose of this video was to empirically test whether sharpening high carbide volume, high hardness steels on aluminium oxide abrasives which are theoretically unable to abrade the vanadium carbides in the steel results in an inferior initial sharpness, apex strength, or high-sharpness edge retention relative to sharpening those same steels on CBN or diamond abrasives. The knife used in the...
AlOx and SiC vs. Vanadium - Part 3: SPS-II 3000
มุมมอง 4798 ปีที่แล้ว
The purpose of this video was to empirically test whether sharpening high carbide volume, high hardness steels on aluminium oxide abrasives which are theoretically unable to abrade the vanadium carbides in the steel results in an inferior initial sharpness, apex strength, or high-sharpness edge retention relative to sharpening those same steels on CBN or diamond abrasives. The knife used in the...
AlOx and SiC vs. Vanadium - Part 4: King 4000
มุมมอง 4618 ปีที่แล้ว
The purpose of this video was to empirically test whether sharpening high carbide volume, high hardness steels on aluminium oxide abrasives which are theoretically unable to abrade the vanadium carbides in the steel results in an inferior initial sharpness, apex strength, or high-sharpness edge retention relative to sharpening those same steels on CBN or diamond abrasives. The knife used in the...
AlOx and SiC vs. Vanadium - Part 5: Spyderco M
มุมมอง 3288 ปีที่แล้ว
The purpose of this video was to empirically test whether sharpening high carbide volume, high hardness steels on aluminium oxide abrasives which are theoretically unable to abrade the vanadium carbides in the steel results in an inferior initial sharpness, apex strength, or high-sharpness edge retention relative to sharpening those same steels on CBN or diamond abrasives. The knife used in the...
AlOx and SiC vs. Vanadium Part 1: SPS-II 13,000 and Spyderco UF
มุมมอง 9K8 ปีที่แล้ว
The purpose of this video was to empirically test whether sharpening high carbide volume, high hardness steels on aluminium oxide abrasives which are theoretically unable to abrade the vanadium carbides in the steel results in an inferior initial sharpness, apex strength, or high-sharpness edge retention relative to sharpening those same steels on CBN or diamond abrasives. The knife used in the...
Crossgrain Pushcutting Newsprint off a Norton India Fine
มุมมอง 3.6K8 ปีที่แล้ว
An attempt at obtaining an apex off a Norton India Fine (~320 grit) that will pushcut newsprint crossgrain. Please note that my theorizing as to why the apex was able to make those crossgrain pushcuts was purely speculative and likely incorrect, upon further reflection.
From Dull to Crossgrain Pushcuts in 5 Minutes
มุมมอง 2.9K8 ปีที่แล้ว
This is my current idea of the most optimized possible approach to achieving a very high push-cutting sharpness as quickly as possible. I use an SPS-II 1k to cut off the old apex and shape the edge bevel until it no longer reflects light, and then set an apex using a suede bench strop pasted with 30 micron CBN emulsion.
Will it sharpen?: SPS-II 1k vs. Ceramic Knife
มุมมอง 5K8 ปีที่แล้ว
I got a crazy idea to test just how high the cutting ability of SPS-II stones are as a result of being made of silicon carbide with virtually no binder by trying to sharpen a ceramic knife. It went better than expected, actually...
A Comparison of Deburring Techniques
มุมมอง 13K8 ปีที่แล้ว
This is just a quick comparison of three different deburring techniques: Pulling the apex though a piece of wood, pulling the apex through a cork, and shearing off the burr using high angle passes. If anyone watching this has had any repeatable success with pulling the apex though a stiff material to deburr, could you please leave a comment and explain the techniques, because I found I had no s...
Shearing off a Burr Using High Angle Passes
มุมมอง 9K8 ปีที่แล้ว
This is just a short demonstration of the method I use to cut/shear off a burr. Starting with the side of the edge bevel opposite to the side last worked on the stone male 1-2 alternating very low force edge-leading only passes at ~40-45 degrees followed by 5-10 ultra low force alternating edge-leading only passes at the angle the edge bevel was sharpened or shaped at to remove the tiny microbe...
King 1k vs. CPM-M4
มุมมอง 1.2K8 ปีที่แล้ว
I've often seen it said that King waterstones cannot sharpen wear resistant steels like CPM-M4, and I always find that confusing because I regularly use a King 1k/4k on CPM-M4 and ZDP-189, so I decided to make a couple of short videos demonstrating that Kings will cut both M4 and ZDP the way I use them.
A Brief Introduction to Coarse Particulate Abrasive Stropping
มุมมอง 2.9K8 ปีที่แล้ว
A Brief Introduction to Coarse Particulate Abrasive Stropping
Push cutting newsprint with a Calton Cutlery 440C Necker
มุมมอง 7619 ปีที่แล้ว
Push cutting newsprint with a Calton Cutlery 440C Necker
Multiple tomato push cuts with a Calton Cutlery 440C Necker
มุมมอง 7509 ปีที่แล้ว
Multiple tomato push cuts with a Calton Cutlery 440C Necker
I have one hella of a time removing these damn micro burrs, I believe this video will help me, and it logically it makes sense ! - Ty and Cheers !
Did it help you?
Can someone explain why the orientation of a stone and flattening medium make any difference? Very baffled I am by that statement. I have flattened many friable stones by rubbing them together vertically or in any orientation as far as that goes. A late post but I'm very interested how others use these. I own several myself and due to the vitrified binding I use SIC powder and float glass to flatten them, on my tilted driveway. I will say, Impressive results with the India fine. Thank you.
After the high angle passes, I'm wondering if you may have over sharpened it, with 4 passes on each side, which introduced a small micro burr. Anytime I do this myself I find that it always cuts better if I leave it alone after doing very light pressure reverse high angle passes on my honing rod, then if I try to do any number of passes on the original sharpening angle, so with that said if there is a tiny micro bevel there, oh well I can live with that, because whenever I try to "fix" it, it just makes it worse
Just now getting into freehand so I'm about 8 years late on this video. Very clear angle and simple explanation. I'm very happy to have found this, removing the burr using wood, cork, or rubber works but I've been unhappy with the results for those softer more tenacious burrs that didn't just snap when stropping. Much happier with the results using this method. Thank you.
Thanks Steel.......have you tried 16 micron Diamond Spray using the same procedure?
Thanks Drake, always interested in your work. Wish you would come around more often now.
Drake, thanks forthe video. What stone is this and are you using oil as a lube?
Drake, thanks for the video. On the King Water Stones, were you using oil or water?
Drake, thanks for video.......what is the lube used, if any?
Do you mean to do this burr removal on the coarse stone and then 10 passes at a time on the finer stones or do you go straight to the finer stones still doing 10 passes at a time then do this burr removal method on the fine stone? Great video btw. Very impressive!
Great video! I'm a bit confused though. Is this done on the final stone? I use a king 1000/6000. Would i raise my burr on the 1000, Polish on the 6000 and then do this technique on the 6000 as well?
Thanks Reddit for linking me to this video ( I can't imagine why this video didn't get more views)
I de-burr with the end grain of a 2x then give it one or two quick stripping passes and that generally seems to refine the edge nice and smooth
What a fun hobby ! I've been doing this for 60 years and still learning. Very interesting.
idk what you think shaving into the grain of pine wood or whatever that is going to accomplish, especially on a steel like that. It's not going to do anything. Maybe if you did that 1000 times in a row you could notice some change, qualitativly. No clue what you're trying to accomplish. I've got a decent eye for it, and it doesn't look like you're getting particularly exceptionally edges off the stones there. Slicing copy paper is hardly a test of edge keenness at all, it doesn't prove anything other than maybe quickly guiding you to where any inclusions, ie nicks or rolls, in the edge might be, or the fact that yes you have an edge. It doesn't look like a very keen edge, but it's an edge. Try slicing through a free hanging paper towel. Not a supported pt like I've seen you do a few times talking some mumbo jumbo about "aggression." Hold the pt between two finger so it's hanging by the force of gravity, draw the knife through it, the knife should fall through it like it doesn't exist. You should be able to do that straight off the stones. That's a valid practical test for you.
I realize knife land of mostly basically nonsense and myth and assorted boy brained bullshit. But I don't know where you got the idea that coated abrasives like diamond plates can be compared to Waterstones in their grit ratings. Grit ratings more generally are arbitrary. Even quoted abrasive particle size is more arbitrary than you might think, because it depends on how the abrasives are bound. Softer binders leave softer scratches even with the same abrasive particle size as another stone with a harder binder. You're calling out a lot of things bs which is indeed bs but you also make a lot of faulty assumptions of your own.
Hi, do you know if Silicon Carbide sanding belts will work on ceramic knives by means of a belt sander? Thanks.
Is the SPS II 3000 really made out of Silicon Carbide?
I don't think so. The 240 and 1k use green silicon carbide, which is great. But, for half the price a naniwa traditional 240 is also green sic. So is a norton 200. op has a very optimistic sense of self confidence. I'm still a big fan of the 240 and 1k sps. And they can absolutely sharpen any knife steel you're going to come across, even if you deal with these gimmicky spidercos as they're the only company that makes stuff like that. Obviously diamond or cbn is a superior abrasive. Theres a reason those are called super abrasives. The issue is coated abrasives like plates are shit. And bonded diamond abrasives are rare, niche, not generally available in consumer market and very expensive.
Amazing!! Would the Sigma SPS-II 3000 be able to cut and refine the ceramic knife further?
Interesting, and entirely the opposite of my experience with the stone. I was not able to get anywhere with the King Stone against any powder metallurgy steels. Might have to retry with some experimentation.
Just from the intro I already know this is going to be a good sharpening channel. If anyone still bother you with that Todd from Science of Sharp did a study with electron microscopy and proved aluminum oxide is capable of cutting vanadium carbide. They get worn to the same level as the rest of the matrix. I don't understand how the physics behind that works but that's how it goes. 10 degree sharpening with microbevel does wonders. I also love it. Usually I go with 15 degrees microbevel but sometimes 20 is necessary. I never sharpened anything close to Maxamet, how did it perform with microbevel?
I’m surprised that you did not use a leather strap with compound. I always use 320 grit silicon carbide stones and they work great and two or three strokes on a leather strop with white compound will give you a razor sharp edge that will shave hair.
I have tried several methods to deburr and edge leading is the best I found. After deburr you can get a finer edge with alternating edge trailing strokes, with low grit stones the difference is quite noticeable.
Do you do this high angle pass on the finishing stones? I have king 1000/6000 so I assume I would sharpen on 1000, raising a burr on both sides. Then use 6000 to polish the edge and high angle passes? Then the edge leading to remove micro bevel?
@@Sharp.Penguin00 The way I sharpen depends on the use of the knife. For chef knives I lower sharpening angle to about 7 degrees and finish with a 15 degree microbevel. As long as you cut without impact and don't touch bones this is strong enough to hold an edge even with soft 53HRC steel. I don't remove the microbevel, going lower than 15 degrees will damage edge retention on most knives except some high end cutlery. Optimizing sharpening angle it's not so simple but that's a good starting point. The stone I finish depends on what I plan to cut. Barbecue, cooked meat, rope and vegetables goes well with low grit. Hair, wood and raw meat goes well with high polish. For a general purpose chef knife I recommend from 1k to 6k finish depending on how much raw meat you cut.
@@thiago.assumpcao thank you! I use my chef knife for almost everything. Cutting whole chicken, veggies, steak slices, etc. Just so I'm understanding correctly, you recommend finishing on a 6k to polish the edge and then raise the angle? Or just use the 6k to make the micro bevel?
@@Sharp.Penguin00 I leave 1K once the knife is shaving or cutting paper towels. Several experienced friends prefer leaving it at 1k. I cut a lot of raw meat so I prefer to finish 3-6k, on these stones usually I only work on the microbevel but if you polish near the apex it has slightly better cutting performance. A friend of mine likes to polish the edge on 6K then finish with a microbevel on the 1K.
❤ @@thiago.assumpcao
awesome stuff thanks, good to have a different viewpoint.
Great camera work.
Great video, how many passes and what angle for burr removal? How many passes to reset main bevel without forming another burr? I know each knife and stone is different, I just want to know your thinking.
Rex121 can easily be ran at 68rc.... in fact 70-71rc rex121 is stable at.
Excellent video on your method. I liked it very much (as your other video with comparison of wood / cork / high passes deburring), and I can't wait to carry out your method when I'm sharpening my knives.
hello, sorry for the beginner question, but i cant decide between 'spyderco medium' and this 'india fine' or 'arkansas hard' i have dmt coarse and i want a stone that is a bit finer can india fine get a 1000 or 1500 grit finish?
Hey Mate, do you think that you are ever gonna make Videos again?
Excellent ! You da man !
Excellent
Dude thank you shoot a lot for your scientific Content, I watched alot of your videos and they helped and teached me alot, I really like the technical approach and that you share all that with us and in forums!❤️
Great video brother
That would explain my problem, I often strop my knife after using the sharpening steel, and I recognized that they don't cut as well as if I just use the steel alone, I then steel them again and their capabilities are back, I use the skerper grey compound with 4 Micron, and the knifes came of the King KDS 6000, which compound grit would you recommend, when the steel isn't enough anymore?
This comparison video was an exciting thing to watch. And painful. I guess I never really thought about the wood dragging method of tearing off burr quite like this before. Just the word tearing makes me shudder after all the work to profile and apex a blade. Your high-angle pass method does seem very useful under similar circumstances, such as edge leading sharpening on a firm abrasive. If using a “slurry” whetstone abrasive, I wonder if one can get the same deburring effect and results using edge trailing strokes with light pressure at a high-angle? In any case, I will try this method out during my next batch of knives. On another note, I’ve noted that some sharpeners, such as yourself, rotate their blade through the curve to the tip, while others just lift the handle slightly with no rotation. I’m curious to know if you think rotating has any advantage over just lifting the handle. One impact I can actually see is the scratch pattern of the knife bevel through the belly to the tip isn’t congruent if one rotates the blade. Thanks again, K
Thank you!
Your tutorials are the best freehand sharpening tutorials on TH-cam. Everyone else screws up the deburring. Thanks.
Man that sound of the slice with the grain. Awesome!
Did you overgrind on the backsharpening though? I feel like the edge is catching again in 2 spots.
Drake we need u back
Beautiful
Where’d it find that orange tray?
Thank you!! <3
Can someone please clarify that shearing the burr off with high angle passes on edge leading as opposed to edge trailing makes a differance or is it personal preference.
Faz diferença.
very nice. i also have one of Joe's first 440 neckers. i love the "grain" indicator
Just found this video now and wanted to say thank you especially for the info on the Spyderco bench stone scratch pattern equivalents. I’ve used Spyderco stones a long time with the Sharpmaker and now with the bench stone versions and I have always felt like they were much finer (and slower cutting) than the grit numbers Spyderco throws around. 4/8/13k would fit my experience much more reasonably. Interesting seeing you use oil on this as well. I’ve used mine with water and it felt like it slowed the cutting even more but made it silky smooth and reduced loading quite a bit.
I know it's 3 years after you published this video, but here's some evidence about alumina not cutting VC. scienceofsharp.com/2019/11/03/carbides-in-maxamet/
When sharpening is so easy for you that you add a slippery underpacking to increase the difficulty. This man knows how to sharpen!
Very fun series to watch. I must admit that it defies or seems to conflict with some SEM images posted by credible sources. However, I must say that your testing is very compelling and I too appreciate your efforts on this. Like you, I am more about “getting to the monkey” as quickly as possible these days. On high-end steels that means reaching for diamonds/CBN and getting on with it. I love that I can transition over to the nice Ceramics for finishing and get rid of the ugly edge left by the diamond. Thanks again.