Tag Archives: de-shouldering

Advice, Folders, Review

MILITARY™ 2 BROWN G-10 CPM® 15V® SPRINT RUN® – Part 2: Convexing the edge.

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You know what ? It’s time to thin the edge of Gambit.
Pictures are better than thousand words.

The gaffer is here to protect the blade against my clumsiness.

The Double Stuff 2 is the main tool. But it is old now.
It has lost some of its teeth in many many edges reprofiling…

But eventually it is a cheap Sharpy bought on Amazon which seems to be 15V best friend. It is 800 grit.
And it bites into 15V like no tomorrow.
So I was able to round the edge’s shoulder. Let’s test it.

It goes deep and steady.
There is real improvement. But gosh, 15V do not like to lose its particules. Compared to Magnacut or SPY27, CPM-15V is hellish.
Now I perhaps don’t have the best diamond tools for that.
But really, it is not a piece of cake in my book.

Now could it be a answer: The Military 2 reaching the 67 HRC ?
But that was exactly my impression after watching the YouTuber’s video — until Jake, a metallurgist for 14 years, left an exceptionally detailed, well-sourced comment under this review.
To quote his conclusion:

“… Spyderco did an amazing job getting a near custom level heat treatment on an amazing steel at an affordable price to many people who otherwise wouldn’t have been able to spend large sums of money on customs. But expecting 67Rc is a bit too much. Shawn has said it repeatedly that it isn’t realistic for a production knife company to hit hardness levels that high and also be able to work the material.“

Many thanks to Jake for his eye-opening comment — truly appreciated!

Advice, Folders

GETTING A CONVEX EDGE WITH THE CPM-15V BLADE OF THE HOULAHOULA PARA3 LIGHTWEIGHT PART 2.

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Since the first try of convexing the Para 3, it is time now to reach the same level of de-shouldering as on my Sage 5 Salt.

My goal here isn’t to touch the edge itself, but to smooth the border between the flat of the blade and the edge angle. This allows me to maintain the edge primarily on leather while reducing drag when cutting hard materials like plastic or wood.

The equipment I used was again the Spyderco Double Stuff 2, focusing mainly on the diamond side. I experimented with gentle, round strokes on the flat diamond stone instead of always moving in the same direction — it seems to remove metal much faster.

For aesthetics, I plan to follow up with white ceramic or jade stones to approach a mirror finish, similar to the Sage 5. Magnacut responds beautifully to polishing, whereas CPM-15V doesn’t particularly care.

The use of gaffer helps preventing any deep scratches on the blade finish.
It works great. The black dust is metal removed by the diamonds.
I do that outside in the wind. I don’t want to breath that dust.

Eventually this second round has gone so smoothly (compared to the first one linked at the start of this review) that i was on the verge to work on the Military 2.

Remember Sal saying:
“The Edge is a Ghost. Always changing. Dying (dulling) being reborn (sharpened) split personality (angles and geometry changing). Think of the edge as gas in a vehicle. It runs out of gas and you put in more gas. We provide the format, materials, design for use, variety to avoid boredom and create interest, but the edge is your creation. The result of your understanding, education, experience and practice.“

The comparison between the Sage 5 Salt and the Para 3 continues. In short: the Sage 5 has superior geometry thanks to its high 3 mm FFG blade, while the Para 3 features a sturdier blade, a thinner point, and is overall lighter (no steel liners).

It’s really your choice — both are highly capable and complement each other, coming from the same design mind. Shawn Houston even notes that the Para 3 carries “that Delica vibe.”

I’m impressed by the Sage 5’s exceptionally smooth action — one of the best among Spyderco’s compression lock knives. I love both knives. These days, the Sage Salt rides with me, but while both won’t let you down, the smooth Sage is more fidget-friendly. Both are great, but the Sage 5 is simply less popular… 😉

Advice, Folders, Review

For another fistful of minutes – De-shouldering the Spyderco Sage Salt Part 2

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Let’s go back to the same process but adding 15 minutes more can be a game changer in term of geometry. But let’s be clear this is typically the Pareto law which says: “The Pareto principle states that for many outcomes, roughly 80% of consequences come from 20% of causes.”
It means that in 15minutes + this new 15 minutes it is not the most efficient as 80% of the job was done during the 6 first minutes last time.
But those added fistful of minutes are a little bonus to even the bevels.

As you can notice I have concentrated my thinning process mainly on widing the bevel.

10 minutes later, I got a more even larger bevel which should go shining after some leather stropping.

On another fistful of minutes, I will work on the tip but I like to keep some material here.
Now I’m basically dealing with a flat grind with a convex edge at the end.
In Japanese a convex grind is also called a hamaguri grind. Literally this means: clam. This name comes from the convex way the side of the shell moves to the end. Exactly like the full convex edge. A full convex grind is sometimes also called an appleseed grind. Again because of the pointy tip of the seed of an apple.( I’m a fan of  アップルシードa Japanese manga series written and illustrated by Masamune Shirow.)
But for now it is much than satisfying in terms of whittling and dealing with hard maetrail to cut.
The edge goes deep in every push cuts and the high FFG blade five a lot of control for powerful results.

(Badge designed by Guillaume Xais)

So far my initial impression are confirmed: the Sage 5 Salt is a keeper and another 3 inches blade length Spyderco to rule them all like the Delica 4, the Native 5 or the Para 3 or even the UKPK ! All are Sal Glesser’s children (The Para 3 paternity is shared with Eric !)


It is perfect in all aspects – sharp thin blade, centered, strong detent compared to the Military 2, no blade play, suuuper smooth.
The Sage5 is the best implementation of a compression lock I have ever had… Perfect tolerances and no lock stick.


The open-backed construction allows easy cleaning. This Sage 5 is really asking to be used and, thanks to its yellow handle, retrieved even on the forest or ocean floor. Really a must have 3 inches knife for all occasions.
And I’m a huge fan of the Native 5 and the Para3. But this Sage 5 seems to lead the pack.

Review

De-Shouldering Process – How I get a convex edge in 15 minutes.

2 Comments

The new Sage 5 Salt got a great geometry but I love convex edges.
I like to remove the shoulder on the edge and with diamonds it is only a matter of minutes.

First thing. I do protect the sides of the blade to avoid scratching because I’m clumsy. I use thick duct tape AKA gaffer used to fix everything on the movie sets for everything including marks on the floor or information on magazines.

As I’m clumsy it even not symetrical.

Next I use some diamond. Here it is a Spyderco Double Stuff II.

A two-sided pocket stone has long been the sharpening tool of choice for fishermen, outdoorsmen, and other knife users who needed a handy, versatile sharpener for touch-ups in the field.

In 7 minutes I got that result.
I do not touch up the edge, my angle is aim toward the shoulder of the edge to thin it.
You can see the edge is styill the factory edge.

Now it is just a matter to rinse it.

The factory edge still is razor sharp.
But the geometry is improved and it cuts much more easily into hard matter.
In 15 minutes I got an edge like I want. This was made on my Sage Magnacut.

Now with a more convex edge it is easier to strop it on leather.
Magnacut behave a lot like Cruwear and both love leather.
It won’t be that easy on CPM – 15V which needs much more patience !
Anyway a part 2 is now available.