Sharpening Stone Identification

  • Advertise with us

« back to Hand Tools forum

Forum topic by steveinaz posted 08-20-2017 05:43 PM 994 views 0 times favorited 4 replies Add to Favorites Watch
View steveinaz's profile


53 posts in 2336 days

08-20-2017 05:43 PM

I just picked up these two stones at a tag sale. I figured I could bring them home, flatten them and add to my arsenal. One is more course than the other. They are very hard. I used a diamond stone and made very little progress over the course of an hour. I don’t know if it is worth it to put more effort into them as I am not sure of their value. I have a couple water stones and diamond stones. The backs might be easier to flatten, but I’m not sure if that side is usable. All comments appreciated.

-- Steve in AZ

4 replies so far

View Aj2's profile


3952 posts in 2960 days

#1 posted 08-20-2017 08:52 PM

I don’t know what they are but I do know that some of those types of oil stones will turn a 220 Dmt into a worthless piece of plastic.
If you really need them flat find a flat cinder block to get you most of the way.
Gook luck and nice find.

-- Aj

View steveinaz's profile


53 posts in 2336 days

#2 posted 08-24-2017 07:28 PM

I spent a dollar on a cinder block and tried to flatten the stones. This seems very much like a losing battle. I wonder how many years it took the previous owner to dish the stone. Thanks for your reply.


-- Steve in AZ

View gargey's profile


1013 posts in 1937 days

#3 posted 08-24-2017 07:40 PM

I’d think a DMT Dia-Flat would work. But those are $150+

View Loren's profile


11232 posts in 4810 days

#4 posted 08-24-2017 07:41 PM

Those stones are probably silicon carbide. That’s
the same stuff gray grinding wheels are made of.
It’s very tough and hard-wearing. They can
allegedly be flattened with silicon carbide powder
lubricated on a piece of plate glass. I doubt
however it is worth the investment. The stones
are typically not very expensive.

You can get coarse Japan water stones made
of silicon carbide in a soft clay binder. I’ve
never used one but I presume they cut pretty

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics