• Advertisement

Sharpening on wet & dry SiC paper

English language only

Sharpening on wet & dry SiC paper

Berichtdoor Kwakster op 08 feb 2020, 17:44

User Fallkniven A1 Pro in CoS stainless steel @ ~60 HRC from an experienced Dutch hunter, with it's apex at ~30 degrees inclusive.
The factory edge reflected light from slow wear, no dents or chips, and the owner wanted the new edge to have a somewhat toothy apex.
Pulled the edge a few times very lightly over a Chinese 3000 grit diamond plate, this to remove the weakened metal in the old apex and create a very narrow and continuous light reflection all along the edge.
I use this line as a guide to sneak up upon while sharpening, and in the end make it disappear as evenly as i can.

Sharpened the partially convex sides of the blade by hand to a new apex with an ever so tiny burr using only 1000 grit wet & dry SiC paper on a semi-hard rubber backing with WD40 as a lubricant, while regularly checking with my Tormek WM200 AngleMaster to make sure that the newly forming apex would also become ~30 degrees inclusive.
When this was done i removed the tiny burr with some careful light stropping on a piece of hard cardboard with a bit of 1.0 micron mono-diamond paste.
The sharp diamond particles are very efficiƫnt in removing tiny burrs on high alloy stainless steels, while the hard cardboard has just enough give to make sure that most of the toothyness in the apex from the 1000 grit wet & dry remains.
The new apex is just keen enough to pull a chest hair taught from root to tip and sever it close to the point of holding.

Took a number of pics with part of the camera & my finger in them on purpose to give a better idea of the scratch pattern.
You can click each picture 2 x for more detail.

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding
Kennis weegt niets.
Avatar gebruiker
Kwakster
Forumbaasje
 
Berichten: 4086
Geregistreerd: 01 jan 1970, 00:00
Woonplaats: Apeldoorn

Re: Sharpening on wet & dry SiC paper

Berichtdoor Kwakster op 08 feb 2020, 17:44

Spyderco Stretch laminated blade with HAP40 core @ 63-64 HRC and an edge measuring between 25-30 degrees inclusive from the same owner as the A1 Pro in my first post.
The old & a bit pitted apex was removed on a Chinese 3000 grit diamond plate to create a very narrow and continuous light reflection all along the edge, then the blade was thinned by hand using 1 full sheet of 400 grit wet & dry on a semi-hard rubber backing with WD40 as a lubricant, right up to the still flattened edge, and then refined & apexed to an ever so tiny burr on 1/2 sheet of 1000 grit wet & dry on the same backing with again WD40.
The burr was then carefully stropped off on a piece of hard cardboard with a bit of 1.0 micron mono-diamond paste.
The new edge measures ~20 degrees inclusive and is reverse chest hair whittling sharp with just a bit of tooth.

Before:

AfbeeldingAfbeelding

After:

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

Afbeelding
Kennis weegt niets.
Avatar gebruiker
Kwakster
Forumbaasje
 
Berichten: 4086
Geregistreerd: 01 jan 1970, 00:00
Woonplaats: Apeldoorn

Re: Sharpening on wet & dry SiC paper

Berichtdoor Kwakster op 08 feb 2020, 17:45

Recently acquired this venerable oldie (1972-1974) which had a rounded point, no edge, and a handle filled with crud.
Cleaned everything with tootpicks, an old tootbrush with diluted detergent, and lastly an ultrasonic cleaner, polished the brass, then reground the blade by hand on 400 grit wet & dry paper with WD40 as a lubricant.
The new convex edge measures ~25 degrees inclusive and there is a new point too.

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding

AfbeeldingAfbeelding
Kennis weegt niets.
Avatar gebruiker
Kwakster
Forumbaasje
 
Berichten: 4086
Geregistreerd: 01 jan 1970, 00:00
Woonplaats: Apeldoorn


Keer terug naar International Knives & Tools

Wie is er online

Gebruikers op dit forum: Geen geregistreerde gebruikers. en 1 gast

cron