Sharpening K390

[jpm2]

Regardless of steel, synthetic silicon carbide stones like norton crystolon, Baryonyx manticore, etc for thinning, repair, edge setting.
Diamond plates for finishing, refining and light apex work. Most of my plates are eze-laps.

 

[THG]

I use my DMT Hardcoat diamond stone in fine and ultra fine to sharpen K390.

My DMTs have lasted for decades, which makes them a good investment IMHO. I don't know how other makes compare.

Yep, if you are going to be getting into the "super steels", it is worth buying some diamond plates as others have mentioned.

I also use DMT. I have the DMT 6" dia sharp kit. 2 diamond stones, both double sided, so 4 grits. xtra coarse, coarse, fine, xtra fine. The set runs under a $100.

I have DMT stones from as far back as 12 years ago, and they are still great to this day. However, a month or 2 ago, I just bought a set of 6x2 continuous diasharps (XC to EF) because my older stones are all different sizes. Except for the F stone, all of the others have imperfections on the surface. The edge will snag on these imperfections and leave a dull spot. These imperfections don't seem to be diamonds, and they aren't going away after breaking in.

I can no longer recommend DMT diamonds

 

[gazz98]

I have DMT stones from as far back as 12 years ago, and they are still great to this day. However, a month or 2 ago, I just bought a set of 6x2 continuous diasharps (XC to EF) because my older stones are all different sizes. Except for the F stone, all of the others have imperfections on the surface. The edge will snag on these imperfections and leave a dull spot. These imperfections don't seem to be diamonds, and they aren't going away after breaking in.

I can no longer recommend DMT diamonds

Interesting. My dia sharp kit is probably 4 years old. Still going strong.

Since your purchase was recent, I wonder if DMT has covid issues (staff shortages, material shortages, etc) that has affected QC. Sorry to hear about your purchase THG.

 

[FK]

DMT diamond used for years.
Blue - coarse - well broken in with years of use.
Red - fine - also well broken in
Green - Extra fine, fairly new
Leather strop - 4 micron diamond paste
Leather strop - 1 micron diamond spray

Touch up with strops weekly or when required.

Regards.
FK