Bart
Well-Known Member
About a year ago, I brought 2 so-called "Cotcarbs" with me from one of the visits to Ardennes. I had seen them over there before, knew what they were, but never really got around trying one. Around that same time, a few of our members were looking for a cost-effective hone to repair damaged razors' edges and jump straight to a Coticule after that. Sliced bread for a DMT-600grit, but there are plenty of equally great alternatives on the market of synthetic hones. But what about the "Carb" side of a "Cotcarb"?
For those who've never heard of it, a Cotcarb is a thin BBW glued to a thin carborundum stone of approximately 600 grit. It is produced by Ardennes Coticule and aimed to a pocket/kitchen knives market. It is sold in several dimensions, from small pocket models to large bench stones.
Here's a picture (from Ardennes' website):
There's also a variant, glued to a wooden paddle:
It sounds like an excellent idea, and I wondered about the quality of the Carborundum side for razor repairs.
I tried it a couple of times and came to the conclusion that the carborundum is really not of the best quality. It's rather gritty, and doesn't survive a comparison against my DMT at 600 grit, which has not only a smoother action but is also faster, doesn't need lapping, doesn't glaze and blablabla. But for sharpening pocket knives the Carborundum side functions, and I wouldn't mind carrying a small one in my backpack during a long hiking trip. It would not only serve to repair the occasional chip in the edge of an abused camp knife, but as we now know, the BBW also puts an edge on a straight razor that leaves nothing to be desired. Sharpening and shaving in the wild, do it once and become addicted!
Nevertheless, as sound as the idea may be, it appeared to me that this product can be improved. Personally, I found the carborundum side a bit too coarse to hand over the edge to its BBW counterpart. For softer pocket knives there's no real problem, but for harder steel, the BBW struggles seriously while dealing with the edge roughness left by the Carborundum. Were it one of the faster Coticule layers instead of the BBW, the story would be different. But even then, the Cotcarb concept would *really* benefit from a better grade carborundum or other synthetic stone in the 600-1000 grit range.
I have sent a Cotcarbs to one of our members, MarkinLondon, and here's his verdict, shared in an e-mail a couple of days ago. (Note that Mark may not have been aware that Cotcarbs exist in larger dimensions as well):
In conclusion, a good idea, certainly when it comes to portability in situations where a very fine edge may be required (the BBW), but the "carb" they've glued it on doesn't really do it justice. It cannot be called an strong marriage and will therefor probably never fetch the reputation of, let's say a Norton 1K/8K combination hone that sits on many tool benches. A bit of a missed opportunity.
Best regards,
Bart.
For those who've never heard of it, a Cotcarb is a thin BBW glued to a thin carborundum stone of approximately 600 grit. It is produced by Ardennes Coticule and aimed to a pocket/kitchen knives market. It is sold in several dimensions, from small pocket models to large bench stones.
Here's a picture (from Ardennes' website):
There's also a variant, glued to a wooden paddle:
It sounds like an excellent idea, and I wondered about the quality of the Carborundum side for razor repairs.
I tried it a couple of times and came to the conclusion that the carborundum is really not of the best quality. It's rather gritty, and doesn't survive a comparison against my DMT at 600 grit, which has not only a smoother action but is also faster, doesn't need lapping, doesn't glaze and blablabla. But for sharpening pocket knives the Carborundum side functions, and I wouldn't mind carrying a small one in my backpack during a long hiking trip. It would not only serve to repair the occasional chip in the edge of an abused camp knife, but as we now know, the BBW also puts an edge on a straight razor that leaves nothing to be desired. Sharpening and shaving in the wild, do it once and become addicted!
Nevertheless, as sound as the idea may be, it appeared to me that this product can be improved. Personally, I found the carborundum side a bit too coarse to hand over the edge to its BBW counterpart. For softer pocket knives there's no real problem, but for harder steel, the BBW struggles seriously while dealing with the edge roughness left by the Carborundum. Were it one of the faster Coticule layers instead of the BBW, the story would be different. But even then, the Cotcarb concept would *really* benefit from a better grade carborundum or other synthetic stone in the 600-1000 grit range.
I have sent a Cotcarbs to one of our members, MarkinLondon, and here's his verdict, shared in an e-mail a couple of days ago. (Note that Mark may not have been aware that Cotcarbs exist in larger dimensions as well):
MarkinLondon said:I must say that after my initial excitement over the rock, my enthusiasm quickly died after sharpening some kitchen knives. The artificial side is too rough to confidently hone a knife on, and the BBW layer is far to thin and narrow to make honing a chef's knife pleasurable. Consider this: in order to hone on the BBW side, I've go to raise the stone up on the side of a large cutting board so that my knuckles clear the counter. It creates a aweful slurry mess on the cutting board and sends my girlfriend up the wall with "get-that-nasty-slurry-off-our-cutting-board" venom.
There's also the matter of whether the two grits (600 and ~4000) are appropriate for kitchen knives. Most kitchen knives (mine, at least) need serious bevel correction work, but the synthetic side is simply rouch and ugly, and provides no confidence to the user. In my limited experience with it, it roughed up the edge a bit too much, so I put it aside and stopped trying. I've seen plenty of youtube videos that use a Naniwa 1K SS for everything, from bevel correction to sharpening, and another bunch that takes JNats through a Botan/Tomonagura progression. but hacking up a knife on a 600 and then expecting a ~4000 to clean up the edge might might not be a reasonable expectation.
None of this is to suggest that the BBW isn't a great kitchen hone. It is, but only after a very clean bevel is established, and I don't think that Ardenne's choice of synthetic is well suited. Also, where I to choose a BBW to use for kitchen knives, it would a much larger rock, perhaps 200x90 and certainly 35mm deep. Whether that's a financially viable product for Ardennes is something only they can answer.
So: My evaluation is simple. Nope. Don't get one. It's a great idea for a product, but not a finished one. replace the synthetic side with a better 1k and increase the size significantly.
In conclusion, a good idea, certainly when it comes to portability in situations where a very fine edge may be required (the BBW), but the "carb" they've glued it on doesn't really do it justice. It cannot be called an strong marriage and will therefor probably never fetch the reputation of, let's say a Norton 1K/8K combination hone that sits on many tool benches. A bit of a missed opportunity.
Best regards,
Bart.