Coticule lapping

**basil** · 07-15-2010, 12:55 PM

Howdy all,

I had a quick question hope you all could answer.

I'm in the hardware store right now about to buy sandpaper so I can lap my coti.

But I can't remember what grit was recommended to do so! Can anyone whose online now help me out please??

Thanks alot everyone!

**Utopian** · 07-15-2010, 12:59 PM

First, you want wet/dry.
I'd say you'd be fine with about 320 grit.
You don't really need to go very fine because a coticule is constantly refreshing itself by releasing grit so it will get smoother with use. Some people feel the need to lap with progressively finer grits but I don't think that is necessary.

**basil** · 07-15-2010, 01:03 PM

Thanks for the quick reply!

I'll be sure to post some pics of my project when I get home.

**basil** · 07-15-2010, 02:16 PM

ok so here is my little project.

Im just about to start so here is my coti. its a nice little one 6x1.5

But as you can see in the second pic it looks like the stone is chipping for some reason is this normal?

And from the third pic you can see how the stone is slanted. when i first got it it had this slant in it but i made sure it was lapped flat even with this slope. but now im going to take the slope out just because it makes it a bit harder to sharper my straights.

Anyways here are the before pics ill post some new ones soon.

**gary haywood** · 07-15-2010, 02:35 PM

Originally Posted by basil

ok so here is my little project.

Im just about to start so here is my coti. its a nice little one 6x1.5

But as you can see in the second pic it looks like the stone is chipping for some reason is this normal?

And from the third pic you can see how the stone is slanted. when i first got it it had this slant in it but i made sure it was lapped flat even with this slope. but now im going to take the slope out just because it makes it a bit harder to sharper my straights.

Anyways here are the before pics ill post some new ones soon.

the slant is normal. the chips not sure as picture hard to tell you could round corners off. i use my dmtc325 for lapping and have used 600 wet and dry. so long as the markings don't catch blade i wopuld'nt worry about it.

**basil** · 07-15-2010, 02:47 PM

Originally Posted by gary haywood

the slant is normal. the chips not sure as picture hard to tell you could round corners off. i use my dmtc325 for lapping and have used 600 wet and dry. so long as the markings don't catch blade i wopuld'nt worry about it.

im lapping as we speak but its going slow.

as for the chips they were noticeable as i ran my hand over it so a blade for sure would suffer from it.

**basil** · 07-15-2010, 02:49 PM

also there is alot of the coti dust. is there anyway i can soak a linen strop in this to use it as a paste?

**Utopian** · 07-15-2010, 02:53 PM

Do you have any idea what caused the chipping?
Did it occur during honing or lapping?
I've never seen such chipping on any of my coticules.

Personally, I would not lap away the slant. It shouldn't be an issue for a hand held hone, and given the size of yours, that's how I would use it.

**Utopian** · 07-15-2010, 02:55 PM

Originally Posted by basil

also there is alot of the coti dust. is there anyway i can soak a linen strop in this to use it as a paste?

There should be no dust as lapping should always be done wet. Have you read the Lapping 101 guide in the Wiki? You should.

**basil** · 07-15-2010, 03:02 PM

Originally Posted by Utopian

There should be no dust as lapping should always be done wet. Have you read the Lapping 101 guide in the Wiki? You should.

sorry i am doing it wet.. i guess coti slurry you would call it, i still dont know all the terminoligy:P

as for the chip im not sure... i only noticed it when i took my coti out the other day to freshen my baldes

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