Flaky Coti

Printable View

03-12-2016, 05:16 PM
TristanLudlow

2 Attachment(s)

Flaky Coti

Hiya fellas,

a question, I have a couple coticules that don't have a crack, but more or so that the coticule seems to be flaking?

Anyone knows if this is a potential danger for the edge or safe? I could hone in such a fashion whereas I'm not honing 'inwards' to it, but go over it from the good side; but I'm wary
I've tried lapping it out, but that didn't help

Preciate any feedback, thanks !
03-12-2016, 05:18 PM
doorsch

Have the same here...if you check you sometimes can see those little hairline cracks going thru the sides...if the crack if big enough or stand over the average high it can hurt the edge if youre moving towards that crack....
03-12-2016, 05:22 PM
TristanLudlow

Quote:

Originally Posted by doorsch

Have the same here...if you check you sometimes can see those little hairline cracks going thru the sides...if the crack if big enough or stand over the average high it can hurt the edge if youre moving towards that crack....

I have one where it goes through the entire stone into the BBW part as well, not on this one
But I think I'll just stay away from these surfaces, on my cotis with cracks I just outline them with a pencil and hone around the cracks, or short of them

I'll keep this coti for it's BBW side mostly

Thanks doorsch!
03-12-2016, 05:30 PM
Frankenstein

I had one too and it was detrimental to the edge. I lapped and lapped and lapped. Had to remove about 3 or 4mm but still enough stone left.
03-12-2016, 06:11 PM
TristanLudlow

Quote:

Originally Posted by Frankenstein

I had one too and it was detrimental to the edge. I lapped and lapped and lapped. Had to remove about 3 or 4mm but still enough stone left.

Aha, that is very interesting, I might as well try it, otherwise it will be mostly unused anyway, thanks!
03-12-2016, 07:56 PM
thebigspendur

Usually if any rock is flaking like that it was probably close to the rock face and exposed to the elements and what you have is weathering. A rock like that should be sent back IMHO.
03-13-2016, 03:24 AM
kcb5150

It can be really bad news. I've had material with fissures like that spontaneously release
03-13-2016, 08:45 AM
Vasilis

Quote:

Originally Posted by thebigspendur

Usually if any rock is flaking like that it was probably close to the rock face and exposed to the elements and what you have is weathering. A rock like that should be sent back IMHO.

As always, you are right bigspendur. Coticule is a very vulnerable type or rock to the elements. BBW not so much. Visiting the quarry, we saw tons of coticule laying around, yet all of them were useless as a hone. Beautiful, big pieces that looked flawless, yet were crumbling into sand and flakes if you picked them up. Even as little as a year or two of exposed stone are enough to make it unsuitable as a hone. We could collect pieces, but nobody left with anything big enough that couldn't fit in a pocket. With Mr. Maurice permission of course.
03-13-2016, 08:47 AM
eKretz

Sometimes you can alleviate the problem with CA. Get the very thin stuff like water and dribble it into the crack. Then place a piece of waxed paper over it and clamp something flat over the top until it dries, then relap the stone. I've done this on one or two problem spots with good results. You might have to reapply the CA after many lappings if it doesn't penetrate all the way to the bottom of the fissure.
03-13-2016, 12:31 PM
TristanLudlow

Thanks for the feedback fellas, this is on 'old' coticule, that I got quite a while ago off an auction site
otherwise that would definitely gotten sent back.
03-13-2016, 01:22 PM
jollo74

Quote:

Originally Posted by eKretz

Sometimes you can alleviate the problem with CA. Get the very thin stuff like water and dribble it into the crack. Then place a piece of waxed paper over it and clamp something flat over the top until it dries, then relap the stone. I've done this on one or two problem spots with good results. You might have to reapply the CA after many lappings if it doesn't penetrate all the way to the bottom of the fissure.

Thin CA (superglue) works, I've tried it successfully myself :) (without the waxed paper).

Cheers
Jörg
03-13-2016, 05:22 PM
eKretz

It can be done without the waxed paper and clamping too, but doing so keeps the gap as small as possible.
03-13-2016, 09:37 PM
thebigspendur

With the weathering issue you never know how far it goes. You can start lapping it and if you are lucky you will at some point reach solid rock. The question is how much if any rock will be left after lapping.
03-13-2016, 10:00 PM
32t

Quote:

Originally Posted by Vasilis

As always, you are right bigspendur. Coticule is a very vulnerable type or rock to the elements. BBW not so much. Visiting the quarry, we saw tons of coticule laying around, yet all of them were useless as a hone. Beautiful, big pieces that looked flawless, yet were crumbling into sand and flakes if you picked them up. Even as little as a year or two of exposed stone are enough to make it unsuitable as a hone. We could collect pieces, but nobody left with anything big enough that couldn't fit in a pocket. With Mr. Maurice permission of course.

Those weathered stones that crumbled easily would sure be fun to play with. Pulverize them finely and have premade dry slurry. Seperate the garnets and make a garnet paste using them. :thinking:

These are just the first thoughts that popped into my head but I could see some interesting/fun experiments.
03-14-2016, 01:24 AM
Utopian

It also could be used just as a slurry stone, or cut into multiple slurry stones.

I have a coticule that is dished at least a quarter inch. I've been using the high ends for making slurry for the past 7+ years. I figure it will be flat in another 50 years or so.