Tag Archives: Sharpening

Benchmade 200 Puukko – Call me Snake.

This is the first Benchmade’s review for a long time. Why ? Not because of the quality of Les De Asis company’s products but because I was not really excited by their production in the last decade after a huge love with their AFCK back in 90’s, and also with Nimravus and all those blades in M2HS which is a tungsten high speed steel, the granddaddy of CPM M4.
I still got a AFCK in M2HSS and browsing that blog, you will find it here.

So here we go, two words has caught my attention on that new Benchmade: Puukko and CPM3V.

“CPM 3V is a high toughness, wear-resistant tool steel made by the Crucible Particle Metallurgy process. It is designed to provide maximum resistance to breakage and chipping in a high wear-resistance steel. It offers impact resistance greater than A2, D2, Cru-Wear, or CPM M4, approaching the levels provided by S7 and other shock resistant grades. CPM 3V is intended to be used at 58/60 HRC in applications where chronic breakage and chipping are encountered in other tool steels, but where the wear properties of a high alloy steel are required.” Source Crucible.

COMPOSITION
C Mn Si Cr Mo V
0.80 0.30 1.00 7.50 1.30 2.75

To quote my friend Max Wedge:
“3V loses 1/3 of the toughness going from 58hrc to 60 hrc (still 1/3 above A2 at 60 hrc, and A2 is indestructible… almost). Both 4V and Cruware start to shine around 60-62 Hrc… so, 3V for choppers, 4V or Cruware for slicers, Cruware having best corrosion resistance ( trait appreciated by soldiers & foresters)”

So this tough short blade made of chopper steel is at a very good bargain !! Let see what it is all about.

The leather sheath is beautiful even (if there is a loop in the stitching… I will upgrade it into a kydex for pocket carry.) and cleverly designed as a dangler. You can remove the loop to transform it into a classical sheath.
There is a place for sparkling rod in the Bushcraft fashion. I don’t care about carry a knife of that size attached to my belt. I prefer to have it inside my pocket or my bag.

The blade is an eye candy for some reason it reminds me the small SOG Seal Pup knife with no false edge but that’s me… Is this a Puukko ?

That handle is made in some kinf of thermorun… but it is rubberized Santoprene is a soft, non-hygroscopic elastomer which exhibits excellent surface appearance, a durable soft-touch feel, excellent colorability and excellent “processability”… made by Exxon.

It is made from underground forgotten dinosaurs and jurassic biomass aka “petroleum” hence the look of scales on it ?  Because that handle looks like some sort of snake or cold blood creature. I love it.

Now is this a scandi ground blade ? Nope. There is a secondary bevel. Is the knife sharp ? Yep, very sharp but could be better. Later/soon on that.

It is a hidden tang construction and you can see the steel in the lanyard hole. This knife is solid as CPM3V is really tough !!
Hidden tang are great when you work in cold weather, protecting your hand from a frozen steel.

That blade is short but handy: it asks to be used hard like… Snake Plissken’s hard actually ! Because 3V is magic in toughness ! 😀

Compared to a Mora or the Urban Hunter (from Pekka Tuominen) the Benchmade 200 stands its ground.

Here are two vision of CPM3V industrial use. Ed Schempp Spyderco Tuff is pure business. So that BM200 should be even tougher as a fixed blade.

Teamed with a Manly Wasp, you got a great combo.


But a puukko (in my book) needs a thinner edge and it is time to scratch that blade to de-shoulder all that. Diamonds do scratches but then scratches will be polished later. Thinner convexed edge is destin to go deep and get twisted; this is a tough steel.

Diamonds, ceramic and leather. Who needs more ?  CPM 3V is really like chewing gum you need abrasive medium to form that convex edge.

A some compound with the leather stropping is mandatory to erase those scratches

See ? Now it is convexed and will be smooth on whittling wood. No worry for that edge stability again 3V is perfect for that use.

Standing next my Serrata which is my only naturally serrated knife.

So now, I just need some white ceramic to keep it sharp and some stropping. It is ready for testing. The Puukko shape is more for me a “Coutelas de Rahan” shape actually (French people will understand but here is the link: Rahan in Wikipedia.
making this little tough knife very appealing to bring it everywhere.
Everywhere is a good point to start. 😉

20190122_092816-017697724220268595202.jpeg

Advertisements

Convexing Cruwear!

This time I have decided since the blade of this Paramillie is thin, to protect it with some gaffer tape.

Same process as usual: diamonds, then ceramic and stropping on leather.
The DC4 of Fallkniven and the Spyderco Double Stuff 2 were used.
I got also an old barber leather I use with some polish.

I use the diamonds to remove the shoulder of the edge to round it a little, this is where you can scratch the blade as the angle used is very shallow.
Once you see the edge is widen, you can switch to tsone and ceramics mainly to smooth the scratches made by the diamonds.
It is very simple and just ask for time and patience.

Cruwear is stropping friendly much less than 52100 though.

20180921_1838251677222632477732001.jpg

20180921_1923527993727319998866233.jpg

Edit of the 24th of September:

More convexing after failing to Patina

20180924_180342-014337770595947064602.jpeg

52100 A guilty pleasure !

20180823_111120-01.jpeg

As you know my experience with 52100 has been enhanced with the owning of a great Paramillie 2 Sprint Run. This steel is staining and pitting just by gazing at it hence the forced patina I have done to protect the pivot’s hidden part.

But then ? After almost a year of rotation how 52100 has behaved ?

“52100 will take a very keen edge. What is often called “sticky sharp” or “a hungry edge.” said Sal in March 2018.  He also said he wanted a Millie in 52100 to be used as Mountain knife.
And this is true. Like SuperBlue steel ! Those folding razor steel are flirting with lightsabers and are strong. Of course you don’t use your folders like a fixed blade as the pivot and lock can be weaker than a tang. “Batoning” (if any) with a folder should be made with the blade unlocked to avoid any stress on the locking mechanism. But lateral blade jolting inside the cutting medium is commun. I do that in plastics when It got resistance but it can happen inside a wooden knot too. So lateral strength especially on a thin pointy blade like the Millie/paramillie and Para3 is not a luxury as is also edge stability.

20180823_110915-01.jpeg

But the greatest joy and satisfaction in owning a 52100 blade is in its honing. This steel is made for leather stropping. In two passes it already get back to razor. Of course, I had convexed the blade to a very thin edge. In a simple 2 minutes round, after a full day of using, your knife is back to uncanny sharpness. This is so satisfying !!

20180823_110654-02.jpeg

The thick bottom of any plastic plastic soda bottle is my favorite test for geometry and bite as it can collapse under the force if not thin enough. The Nilakka is the queen in that game. But my full flat ground blade are all convexed to achieve powerful and controlled cuts. The thinnest of the bunch are my 72100 et CPM M4.

Ghost my CPM M4 millie has been used on various cutting duty involving food and grease as has been my 52100 Paramillie. I don’t do cutting ropes tests or anything which can be numbered, I go with the feeling. Even if I enjoy reading those tests it’s “quantity” over “quality” as a blade is 33% steel 33% heat treatment and 33% blade geometry. Cutting hard wood, looking and touching the wood’s grain and the cut fibers and how the edge behave when twisted inside is my way ad as 52100 is also used in razors: shaving sticks of hard wood is done with ease and control.

For Ed Fowler (grand manitou of forging 52100) when carefully forged and heat treated, this is the most versatile and dependable steel available to the knife industry. He feels that a man who depends on his knife deserves and needs the most reliable knife possible that will not bend easily or break when he needs it the most. A knife that can be sharpened easily and is friendly to his hand.

Ed got a very oldtimer advice for keeping his 52100 blade rust free:
“Any oil will keep rust from the blade, many times I simply apply the oil from the side of my nose or from behind my ear…”
One thing is certain: the more you use your 52100 blade, the more you check it and oil it with your hands.

Appleton_Ron Fowler Sheep-w.jpg

Ed is not stranger to folding knives as he has teamed up with Ron Appleton and forged the blade out of 52100 for his “Chub” in 2001. Ron wanted to create a folding knife that would be capable of withstanding the rigorous demands of a straight blade user.

Our friend Ed Schempp is another fan of 52100 here what he was saying about it in 2005
“52100 is a very good steel. Ed Fowler has spent a life time tweaking this steel to improve performance. With multiple thermal cycles, normalizing and interrupted quenches, and low temp forging has accomplished and extremely fine grained steel.
Most of the time a good smith can further refine the grain on production steel. Some of the grain can be smaller then but not of the homogenous size that Crucible attains in their CPM products.
This translates to a finer cutting edge that can be sharper than S30V. This edge will not necessarily last as long as a high Vanadium steel like S30V, but can a higher initial sharpness.
The thermal treatment to bring the best of what 52100 has to offer will be expensive, although a simple heat treatment will still bring forward a good amount of what the steel has to offer. Differentially hardened blades would be very difficult to do commercially.”

So 52100 is still a guilty pleasure, because you know it will stain, it will need maintenance but when it come to using it hard and hone it back to sharp, this steel shows is true colors !

20180823_111212-01.jpeg

 

.

 

The Spyderco PPT Round 2 — The Son of Anarchy.

20180424_184458-01.jpeg

Strangely I am coming back often to the PPT when I first thought it would be a collection and a safe queen. Safe queen my a$$ ! Pardon my French but there is something quite sensual when holding this knife, something which makes the other feel “hollow” in comparaison. The PPT got that heavy butt “anchoring” it to the palm but also the toxicated finish of the handle’s slab is a delight under the thumb.
There is something almost “paleo” in the finish. Something primal in the mechanical way it feels. It’s dense but is designed to be heavy metal. It’s a knife Opie could have admire…

20180424_184506-01.jpeg

On the performance side, I have decided to get a convexed edge. Diamonds are the only language stubborn S90V seems to understand and scratches on the blade side are, well especially for the clumsy sharpener, something hard to avoid especially when using the stone at a 10° angle to get rid of that secondary bevel. The performance in pushcutting are really enhanced now. I can measure it to the Manly Peak and its thin S90V blade.

20180424_184620-01.jpeg

I use white ceramic to make the steel shiny but S90V is really a tough cookie in the kindergarden of alloys: it’s a game of patience to obtain a nice finish.

But now on plastic I can enjoy the enhancement of that already very thin edge. It goes easy through.

Someone asked me why using a workhorse knife on tomatoes ? Tomatoes may look like some fragile fruits but they are not: their skin got no pity for any dull knife and their flesh will give in under any pressure. The best tools for tomatoes are serrated and micro serrated knives.

20180429_134118-01.jpeg
Hence that test on my polished edges. You need a very keen blade to push cut in a tomato and make thin loaves. Plastic and bambou can be used to test the edge stability which often is only due to thermic treatment of steel.

20180429_134128-01.jpeg

The alignement of the point on the PPT is very different from my Millie and is very close to the experience of the YO2: its makes powerful cuts.
Also the handle makes Icepick/reverse grip very confortable, knowing this is the favorite grip of Philippe Perroti on Fred Perrin’s La Griffe, a grip I have found handy in forcing a door. Just kidding but the confortable reverse grip (à la “griffe de chat” in French) is not a joke.

20180429_143749-01.jpeg

You get also an excellent blade/handle ratio for a choiled knife compared to my Para3 for example.

20180429_143822-01.jpeg

And as good as the non-choiled Sliverax !!

20180429_142459-01.jpeg
My PPT has been used in the kitchen is not easy to clean because the way the hole in the liners are not accessible. This is serious issue if, for example, a piece of raw meat get stuck there and could contaminated the blade. The full Reeve Integral Locks are the best lock for checking your folding for any debris. I would have preferred solid titanium liners without that hidden cheese holes which ask for special maintenance starting by unscrewing the slabs to get full access and complete cleaning.

So in a wrap, the PPT is a compact hard user with very high performances featured by great ergos. It has a really strong character (it feels like it has been done for some Hell’s Angel fan) but once deployed it will pierce and cut with high reliability. Once the PPT is entering the game: this is serious business. For the record Fred Perrin was often one of the knifemakers going faithfully to bikers gathering. Bikers love La Griffe as a neckknife is handy on a ride. So it’s easy to understand some DNA in the PPT design.

20180429_141539-01.jpeg

SLIVERAX — ELEGANT DREAMED ENGINEERED KNIFE – ACT II: Convexing.

20171118_103910-01362796173.jpeg

Many times, people asked me how I was honing my knives to my taste.
I love thin edges and I love edges which can be maintain by stropping on leather.
For that any sharp angle but the edge itself need to removed.

So my first step on the Sliverax full flat ground blade is to remove the shoulder on the secondary bevel. For that I use Fallkniven FB04 diamonds or Spyderco Double Stuff II.

As I don’t want recreate two other angles, I do it free hand creating a gentle natural convexed medium between the grind and the edge.

20171120_123347-01267367917.jpeg

Soo some dark dust of removed metal appears. The edge of the blade is untouched as after some initial testing I do trust it.

20171120_124143-011125093009.jpeg

I need that convexed edge on the belly of my blade, I don’t minde about the tip and the choil which are not where I do apply the most force to push cut through wood for example. It takes 30 minutes to get where I want without to make a mess by scratching the blade finish. It means each pass on the diamond is check with my finger before, sto be certain to focus on that edge shoulder. To obtuse it will scratch the edge and to acute it would scratch the blade finish. So it takes time to be certain for each stroke.

Luckily the manufacturing lines on the blade exactly follow my pass and some miss strokes were not visible.  It takes around 500 passes on each side on S30V.
Then I switch to white ceramic directly.

20171120_125333-011773286312.jpeg

White ceramic brings some mirror polish on the convexed edge and also hone it to razor.
Here I can go much faster as I won’t ruin my blade if I’m clumsy. White ceramic are very forgiving…
Soon I got a very nice mirror on both side and I can go to leather.

20171120_125945-01492821791.jpeg

I use a century old barber accessories I have found in a garage sale in Italy. With some white compound, it has honed my blade for 15 years.
Time to test the blade on a chesnut road.
20171120_125455-011458232424.jpeg

The thinner edge goes much more deeper and with more control and more ease.
Eventually after playing with the knife for 5 minutes on various material, I inspect the edge and there is no chipping or rolling.
It takes me around 45 minutes.
That’s how I proceed to get an edge which suits my need. 🙂
20171120_130035-011101427946.jpeg

Getting my S30V Nilakka back to Zero Grind.

20171109_151902-01861321636.jpeg

As you can notice, my Nilakka was developping a gentle convexing ground since JD had the patience to give a decent edge to it two years ago.
But since, JD has sent me another video showing how tough well heat treated S30V can be and knowing how forgiving my Nilakka and my Wolfspyder were after sharpening beyond factory edge… I have decided to put the blade flat on on diamonds and grind it until the convex bevel disappearance. In fact I was very encouraged with my various experience with that Wolfspyder.  S30V heat treated by Spyderco is now back as a friendly steel in my book.

20171109_142525-01673358995.jpeg

So for one hour I have work on that using a new Double Stuff 2 which I have discovered thanks to Howard Korn from the Knifecenter who gently add it in my last parcel.
The new diamond surface is quite abbrasive and soon the blade was a mess.
But continuing in the same way made the scratches all going in one direction and both side of the Nilakka blade soon were acceptable in term of esthetics.

20171109_153932-011005452034.jpeg There is a lot of matter to remove and by hand, it takes some time.
But eventually I was able to get some sharpness back with not pressure on the edge while sharpening but an even pressure on all the side of the blade.

After all the Nilakka was made that way, the angle of the thicked stock blade was designed by Pekka Tuominen to be a zero ground edge, with no bevel.

There is still a micro bevel but I’m almost there.
My idea for future refreshing of the Nilakka edge it to do like with my Wolfspyder: like scandi sharpening shown in Ray Mears video…. only using the flat of the blade as guide.

For now I got a razor able to make hairs jumping and been harvested with only one caress.

But also it can stand whittling in hard wood: no chipping or edge warping.
More to come very soon, as I will erase definitvely that microbevel, but I need more time…
“I need more time to make good on the promises I made to the world
When the world was moving slower…” Justin Sullivan.

20171109_154643-01285377020.jpeg

Spyderco C22 in ZDP189 — Amazing After Six Years Hunting in Tuscany !

Six years ago, my friend Valter Nencetti took my Walker for a one year mission which turned into a six years journey. It was his favorite knife for hunting and he reported that to me in this article:  https://nemoknivesreview.com/2012/12/30/spyderco-c22-in-zdp189-italian-hunter-update-by-valter-nencetti/

This year, he has given it back to me after I had offered him my Native 5 in 110V which is IMHO an upgrade for Hare Hunting. The Backlock of a Native 5 is a perfect lock for that kind of use, but you can notice the Walker lock as not travel very far. The curved concave notch prevents it to go further.
There is absolutly no play !

For the record skinning hares is not an easy task for an edge as the hairs and the skin are ruining the sharpness very fast. There is a lot of dirt which acts as abbrasive. I have made a video and soon will put it on line.

Being used everyday, Valter eventually broke the clip which is a very fragile part of the walker compared to spoon clips used noawadays in spyderco line. You can also see it was not clean everyday and used as an EDC in the countryside of his beloved national Park in the North of Florence in Italy.

You notice the normal wear on the handle but Carbon fibers is incredibly sturdy as an slob material. It can be easily cure with some 1000 sandpaper work.

There were also no pitting on the blade or on the liner lock. ZDP189 is known for pitting strangely with its 3% of carbon and 20% of chromium. But here anyway, no issues.

I have started to clean the marks on the blade with some sandpaper.

Then I have restored the edge to razor.

No chipping.
No pitting.
No blade play.
No marks on the handle.
A broken clip.

Valter used his knife with no afterthoughts. I know it was not used on wood but mainly as a skinning tool. It has processed hares but also been used on boars and deers. Also it was used on plastic and everyday mondane tasks as Walter is breeding hunting dogs.

That’s not bad for a little gentleman knife which is a true workhorse.