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Anybody have any ideas? I suspect it is a form of coticule from what it looks and behaves like.
Dimensions are 6.25" x 1" x 1.6" roughly, widest part is not ground smooth but seems fractured somehow to shape. Sides are circular ground to be pretty flat and smooth.
http://i1152.photobucket.com/albums/...ps7g9fze8p.jpg
http://i1152.photobucket.com/albums/...psj10tv0lb.jpg
http://i1152.photobucket.com/albums/...psnvmqndjo.jpg
http://i1152.photobucket.com/albums/...ps49x41vf6.jpg
Mhh looks kind lile a slate stone...could you make some wet surface shots ?
Are you sure it is a hone? Looks like a brick to me.
Where are you located, it helps with this
Not sure, but I believe it is a natural stone. I bought it real cheap at an estate sale down the street, nobody there could tell me what it was but figured I'd take a chance on it.Quote:
Originally Posted by Kees
Are you referring to the roughness of the unsurface ground sides?
Southeast MichiganQuote:
Originally Posted by kcb5150
It appears to be a mottled piece of Vermont slate. It could have been a hone or building material, but either way it is well worth testing. Lap it and test. In my experience, best not to use water. Use glycerin and water mix, oil, or lather. A good piece can make an edge ultra keen but a touch live/hot
Actually it kind of looks like limestone.
If you had a little dilute HCl a dropper full would fizz if that were the case.
I have no HCl to test with, can you make it easily?
What would I lap it with assuming it is Vermont slate? I have an Atoms 140 and DMT Diafold from xxc to of. Would any of these be a good choice?
Pretty much anything you have would be fine, they aren't brutally hard and are compliant to lap.
It goes without saying, hack off the spar at the one end and gain yourself a slurry stone for further experimentation.
What would you use to make that cut?
Also, should the stone be lapped with any fluid in particular?
Just lap on water. You can use a hacksaw. Slate is soft. Last time I had a skate with a break like that, I used a coping saw of all things and it still got it done. Just lol the shard off to square it off a bit, grid the surface with a pencil or marker, cancel the grid, grid it again, cancel that one, round off the corners give it a try. For future reference, was way to lap anything not brutally hard is to buy a single granite tile that was polished/lapped and just use that as a base for your wet dry sandpaper. Start at 220 work up to 600-1000 if you want. Anything really hard, you are best off with loose grit silicon carbide on float glass
Yes. Mix salt & hydrogen peroxide but be very careful & google some more about it.Quote:
Originally Posted by Untitled
A 325 DMT will lap it, or the 140 if it is really out of flat, but looks fairly flat in the photo, lap under running water, mark a grid on the stone with pencil.
Test it on a razor or knife and compare the scratch pattern to a known grit synthetic stone.
The purple pattern, green molting and flaking on the back look similar to some Vosegine, I have, but you have a lot more green, But it is a possibility, Voaigine slurry’s easily and cuts very fine.
What color is the slurry and do you have photos of the sides and ends?
Cool looking stone.
Attachment 215666Attachment 215667Attachment 215668Attachment 215669
I put limestone in vinegar to eat it away so that way I can get to the fossils insideQuote:
Originally Posted by Untitled
Euclid: the first picture posted looks like a Lorraine Rouge...does it look like the other three pictures on the back ?
Euclid,
It is very easy to generate slurry with water, the slurry is quit thin and almost milky and once dried is just a shade off white grains. It turns gray with more grinding, assuming from the steel mixing with it which is removed.
It cuts very fine, almost though I do not have any higher grit synthetic stones other than diamond so I am not sure this would equate to much comparison.
I did take a low alloy steel knife at 59 RC w/ excessively coarse finished and thick/obtuse edge (probably 36 grit belt finish and quickly buffed, 60-70 degrees inclusive) and started grinding away at the stone with water (without flushing the water regularly, just adding enough to keep wet) and light pressure. It came to near to mirror polish with the deep belt scratch pattern removed after about 20-30 min.
The photos I posted show all four long sides, the skinny sides are circular ground smooth and the wide sides are left unground. I will get some pics of the ends tomorrow once I have some daylight to work with for proper lighting.
___________
doorsh,
I suspected this stone I have may be a Lorraine Rouge, which why I came here asking about it after using it and doing some research.
@untitled
I can rule out that your one is a Lorraine Rouge, here are some examples i own...the three on the left...
https://c2.staticflickr.com/6/5768/2...b29519_c_d.jpg
I would tend to go towards a mottled Vermont or either a Purple Welsh slate which sometimes shows green inclusions, dots or blotches....
Also the fine french (Vosgian Stone, Purple La Lune) stones sometimes show green inclusions..
Think you guys are right on the slate, thanks for all the help… :)
In an intersting bit of surprise, I've done some lapping to the rough surface of the stone. Here's what it looks like now after lapping on DMT XXC….
http://i1152.photobucket.com/albums/...psy1x4syij.jpg
http://i1152.photobucket.com/albums/...psotipcg0i.jpg
The darker spots are just where the DMT plate was contacting the stone during lapping.
http://i1152.photobucket.com/albums/...ps7an3gxxv.jpg
http://i1152.photobucket.com/albums/...psosxyhpc3.jpg
Would still think on a mottled Vermont Slate or a Vosgienne/Vosgian stone also when we dont know where these stones come from ;-)
OK, figured it couldn't hurt to update this just for further verification.Quote:
Originally Posted by doorsch
Nice looking stone, try it with, a thin slurry and a few drops of Smith’s Honing Solution, or a couple drops of mineral oil. It will wash off with Dish soap and warm water.
Do bevel or round the edges.
My vote is a charnley forest! That green looks too familiar.
Give her the old "hone and hope" technique and let us know how it goes!
Will it put a finishing edge on a razor or is it more of a bevel setter?
Its not a charnly, if you check the left side this shows a typical slate structure so a Charnley can be ruled out....Quote:
Originally Posted by StoneSeeker
Definitely not a Charnley, I've pretty much finished lapping this to flat and it sure looks a lot like slate at this point.Quote:
Originally Posted by doorsch
I will get some pics up later, granted I only got to lap it with very coarse grit so far. Any recommendations what grit I should lap it with to finish?
I was looking through this webpage, it sure sounds a lot like the variegated purple slate they sell as it seemed weathered how it came and then with lapping became darker….
http://www.evergreenslate.com/slate-colors-roofing.ASPX
http://i1152.photobucket.com/albums/...psmhgfel9m.jpg
http://i1152.photobucket.com/albums/...psaalatily.jpg
http://i1152.photobucket.com/albums/...psobhwfqwq.jpg
This was after just a few minutes of very light pressure and water (I didn't create slurry prior to grinding) polishing the primary grind of a utility knife in my possession.
http://i1152.photobucket.com/albums/...psrastodwv.jpg
http://i1152.photobucket.com/albums/...psi7epxf5l.jpg
