Show your Paper Wheel edges

[sammy the blade]

You do some nice work Kwack.

[kwackster]

The owner of this Sebenza 25 bought the knife brand new through an official dealer in the Netherlands, but although he was and is still very pleased with the knife itself, he soon found that the factory edge didn't cut too well.
He tried to improve things with the help of a Spyderco Sharpmaker and a leather strop loaded with some green compound, but to no avail.
So he sent the knife to me, and the first thing i did was to measure the edge angle.
According to my Tormek Angle Gauge it measured 50 degrees inclusive on the straight part of the edge, going up to 55 degrees inclusive from the belly to the point.(!)
This is how the knife looked before sharpening:








First i removed the apex of the old edge by cutting a few times lightly into an old silicon carbide stone, after which i reprofiled it freehand on my Tormek SB-250 Blackstone to an even 30 degrees inclusive.
This was followed by a Paper Wheel with 220 grit SiC to smoothen the grindlines made by the Tormek, then refined with a second Paper Wheel coated with 15 micron diamond compound, and finally removed the burr with a third Paper Wheel coated with 0.25 diamond compound. (this leaves the 15 micron scratch pattern intact as much as possible to preserve bite)
The resulting edge treetops the hair on the back of my hand, can slice single-ply toilet paper, and survives a few cuts into my laminated testblock without any visible damage (checked under bright light with the loupe in my Victorinox SwissChamp)
This is how the knife looks after sharpening:

[LGustin]

Very nice edge. If we were neighbors I would let you sharpen my knives.

[kwackster]

I'd take that as a compliment

[kwackster]

Recovered some old pictures from Photobucket dating back to 2011, showing my vintage Puma 6383 Buddy made in 1972.
The first set of pictures show the knife as it was before sharpening, still with it's original factory edge which was very obtuse and couldn't cut anything well.









The picturess below show the blade after sharpening on my first set of (standard) Paper Wheels, using the silicon carbide grit Paper Wheel for reprofiling/sharpening, and the slotted Paper Wheel charged with the white aluminium oxide for burr removal & semi-polishing.









Specs:

Overall length: 9.6 inch (24,3 cm)
Blade length: 4.8 inch (12,2 cm)
Blade thickness: 3,1 mm
Steel: New Stainless Super Keen Cutting Steel
Hardness: 57-59 HRC
Handle material: Sambar Stag

[kwackster]

All my Paper Wheels on a digital (espresso) scale.
The first unmarked Wheel has 170/200 mesh (90/75 micron) diamond grit glued to it's surface (then waxed) and it's still in the experimental phase.
All others Wheels are coated with various diamond pastes & oil and are in use for quite a few years now.

[Cattaraugus]

An older one, a user custom Jens Anso from a Dutch knifeforum member after a tune-up by a Dutch knifemaker.
Part of the tune-up was a two-step stonewash treatment of the RWL34 blade, which unavoidably also removed the original edge.

I put on a new edge using a standard Paper Wheel with silicon carbide grit, refined it with a second Paper Wheel coated with 15 micron diamond paste, and finally removed the very small burr on the Tormek leather wheel with some 1 micron diamond compound
This leaves an edge that looks almost polished, but has more bite than when finished with the polishing Paper Wheel using standard aluminum oxide.

Before sharpening:






After sharpening:

Just looking at that edge made my index finger bleed.