Thread: 300 grit stone?

Hey guys,

I noticed today in the supermarket some 300 'diamond' grit stones for knife sharpening at a crazy low price. I know I use low grit sandpaper to breadknife and honing at a frown and what not. Do you think a 300 grit stone has any use for razors in the process of restoring them?

I actually have and use such diamond hones.
In germany "Lidl" a supermarket carried a set of 3 diamond plates
(thin plate glued to plastik) in 300, 400 and 500
for 5€ I just had to buy them.

They have been used eversince. I once filed a tanto out of 4mm stock steel
using these plates only, and still they cut very heavy.
For this price they are very cool.
But I hardly bring razors to them, except they really need some bad restoration.
They are a very, very cheap substitution for the dmts,
but they are of absultely low quality!

You may encounter wild particles that will scratch your bevel to death...

lol its the same store and the same combination, only in a different country :-)

Would they be suitable for breadknifing? I would not set a bevel on them obviously, but for breadknifing (I tear up a lot of paper using that, more expensive than the darn stones)

That set has saved me a lot of time lapping. I always start with one of these plates till the stone seems flat and I continue on 120 grit wp sanding paper. These diamand plates are not perfectly flat and personally I wouldn't use it for honing razors or decent knifes.

One of the plates that I had only used once just fell from it's plastic backing last week. I still have to glue it back on.

I've succesfully used 80 grit wp sanding paper for breadknifing on a glass plate. If you use speed and light pressure you won't wear out the sanding paper much.

Yeah, I had to glue mine, too. Like I siad, bottom notch (can you say that? I meant opposite of top notch ^^ )

I once tried to breadknife on these hones, and didn´t find it working for me (at all, on any stone)
I just (right this second) finished a badly, badly recurved blade on the 300 grit stone.
Remember it has seen a lot of use, so all wild particles are gone by now.
Instead of bk'ing it, i just made straight sharpening patterns.
Straight down, with no X or anything, and by fokusing pressure with my fingertips to the heel, or the point.
It took half an hour to an hour until I got a quite flat bevel, without recurve.
Of course I had to change tape frequently.
But it worked very well

They are indeed not perfectly flat, so for laping they are not that useful.
I often lapped stones with them initially, but had hard times on the sandpaper on glas getting the stones really flat.
But I get perfectly even bevels with these stones.
You can tell, the freshly lapped Naniwa 1k takes all the scratches off
and finishes evenly along the whole bevel

I had to use these hones perhaps a dozen times for razors and mostly knifes.
So they paid off for me. If you do a lot more restoration,
I would consider the DMT´s as they are perfectly flat and made of monocrystals that are much more durable

Yup, the DMTC is a 325 grit hone, and people use it for restoration work or for lapping other hones.