Stone for hap40?

[KoDoK]

Just wondering stone option to sharp hap40. I have 1k shapton pro, but it seems to slow. Any sugestion for 1k stone? Thanks

 

[rickbern]

Finer minds than me may chime in but I have a sigma 1k that I’d follow to the gates of hell.

No experience with hap 40 though

 

[Cliff]

The best for these are diamond stones, either vitrified (expensive) or resin bonded (less so) like Venev or JKI

 

[Troopah_Knives]

I would second diamond stones for the easiest experience. Although Hap 40 is not particularly bad to do on conventional stones. You can get a pretty darn solid edge on it with a shapton glass 1-2k stopping on 1um diamond.

 

[Mr Kooby Shemayrew]

Hap40 isn’t particularly difficult to sharpen but it does take more time. Just about any quality stone can do it. Sigma Power stones are designed for hard to abrade steels and they excel in that aspect. The ceramic 1K and 2K are my favorites. DMT Fine is a good option but slower than a Sigma. Upside is that it doesn’t need cleaning or flattening which is a bit of a hassle with the Sigma.

SP 1K will get the job done. If it isn’t fast enough consider a coarser grit of any quality stone. A Norton in the 200-600 range may be a good option.

 

[Justinv]

I have used shapton glass stones on mine without issues (SG 4000) but its very thin. I’ve been using a Venev 800 diamond stone for quite a while now with great results. Its no more difficult than more conventional steels, probably 2 minutes to sharpen. note the Venev 800 is more like 2500 grit in shapton scale.

 

[Steampunk]

I'd go with an SiC stone (JNS 800 Matukusuyama, which is a real workhorse for me on abrasion resistant steels. Or, King NEO 800, which BBB's a fan of.), or a well broken-in diamond plate (I like Dianova, though they're a little small for larger knives. DMT Dia-Sharp Fine/Extra Fine is an option, though the quality has gone downhill quite a bit over the years. In either case, break it in first with the back of a woodworking chisel or plane iron for awhile, or very gently with a piece of mild steel bar.).

SiC water stones feel better to sharpen on, and are more forgiving to deburr on. However, the plates do create a 'crisper' feeling edge, and are of course much lower mess/maintenance. The JNS 800 is quite a soft, thirsty stone.

I've got the JKI resin diamond stones... Honestly, if you're just interested in a 1K-ish stone, I'm not 100% certain I'd recommend this stone in isolation. The 1K works great as a set with the 6K, but I can't say I like the 1K's edge finish as much as plates in this range. It's also nowhere near as easy to deburr on as an SiC water stone, and is a lot more expensive. The JKI resin diamond 1K does eat metal quickly and indiscriminately, with much better feel than plates. It's just not where I personally want to stop sharpening.

My experience with using AlOx stones (Including Shapton GS HR.) on HAP-40, is that they can remove metal, and generate a burr. However, they are slower going, and the edge doesn't have the bite, or last as long as when you use diamonds or at least silicon carbide to shape/refine the apex... That said, a lot of people are really happy with their results on HAP-40 with AlOx stones. My experience has just been a little different.

As Troopah said, 1-Micron diamond paste/spray after a mid-grit stone/plate is a really nice edge on HAP-40. Very aggressive, but still shaving sharp.

Hope this helps.

 

[Keith Sinclair]

Had the 1K JKI diamond stone for years just picked up the 6K last year mainly for folders.

Sharpened the orange Hap40, Para military, & Endela K390 with JKI diamond stones.

The Hap 40 older folder sharpened many times before.

The Para 2 M4 steel been using hiking every week. It came sharp OOTB as spyderco' s go.

The K390 Endela not quite as sharp OOTB as Para 2. First time sharpening these two new folders bought last year.

Low angle thinning little behind the edge slightly lifting blade off stone after each stroke esp. with diamond stones don't want to scratch blade at low thinning angle.

Then cut in micro bevel with 1K no need lift blade off stone at higher micro. The 1K it is easy to cut a micro.

Than the 6K same angle refine the micro bevel. After that refine it more using light pressure very light burr easy to remove.

Was able to get Para 2 just as sharp as original edge, the K390 can safely saw quite a bit sharper than original. I was pleased that the 6K diamond stone acts like a regular higher grit stone using very light pressure to refine a micro bevel to a sharp edge.

Hap 40

K390

Para 2

 

[lesslemming]

I was having a hard time with my HAP40, not because it would get sharp, but because it didn’t feel great on the stone. For me, the issue was solved with the Naniwa Diamond stones. Check out my review in the forums