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Fast chip repairs

Wed Feb 12, 2014 11:13 am


I'm looking to purchase a course stone for doing chip repairs. Currently I'm using a 150-grit diamond plate for this purpose, but it doesn't cut quickly enough to be practical. So, I'm looking at either the Nubatama 120 grit or the Nubatama 60 grit. My questions are as follows:

(1) Is it possible to flatten either of the above-mentioned stones on a 150-grit diamond plate without damaging the plate?
(2) If the answer to the above is "no", then how could I go about flattening either one of those stones?
(3) Should I expect the 120-grit stone to cut appreciably faster than a 150-grit diamond plate, or should I go for the 60-grit stone if I want faster metal removal?

Thanks in advance for your answers.



Re: Fast chip repairs

Wed Feb 12, 2014 11:16 am

Hi John,

I'm not sure how much extra speed you will get out of a 120 or even 60 grit stone and you can't flatten with the plate on these. Usually the coarser stone wins.

Have you considered getting a belt sander? They're fast and you can do the donky work with them and then finish on stones.

Re: Fast chip repairs

Wed Feb 12, 2014 11:31 am

I don't know how large the chips are in your knives but I can usually work out a chip on a 400 in a couple minutes. If it's really bad, I'm talking 2mm deep I'd use my lapping plate.

Either way, even with a belt sander you're going to be grinding away metal and it's going to take time. I suggest taking more time and care so chips don't happen.

Re: Fast chip repairs

Wed Feb 12, 2014 12:01 pm

Lunatic - they may not be John's knives, we don't know that yet.

Re: Fast chip repairs

Wed Feb 12, 2014 12:22 pm

I would not recommend either stone. The 120 is best for single bevel knives and while fast it is not well suited for regular bevels. The mud gets very thick and will scratch up the side of the blade, that and it wears so fast when used on standard bevels you will about cry watching it all go down he drain.

The 60 grit is great for axes or flattening other stones but because the binder formulation is very hard you cannot get enough sharpening pressure on the stone for it to work correctly on lighter weight blades. It can also put large scratches high above the bevel and is surprisingly a slow cutter. The Nubatama 150 or pink 220 would be a much better choice.

Re: Fast chip repairs

Thu Feb 13, 2014 9:50 pm

If you are doing your own knives, I recommend the 150 for most chip repairs. If you are doing major chip repairs and lots of them, the 60 grit and 24 grit (Aratae) are the way to go. Better than a diamond plate in most instances.

The 24 grit will flatten the 60 grit. You CAN flatten the 60 and 24 with the Atoma, but I wouldn't recommend it. The problem is that the diamond will flatten through the individual particles in the coarse stone, and the stone will be less aggressive, essentially texturizing the coarse stone. So you need to rough it up with a piece of the coarse stone or a whole coarse stone.

The 24 and 60 grit work best at high pressure. At light pressure they don't get traction.

So to flatten a 24 grit stone the best choice is another 24 grit stone, ideally two of them, with stone a vs b, then b vs c and a vs c.

Being less of a purist, just use 2 stones. To date I have not needed to flatten my 24 grit stone :)


Re: Fast chip repairs

Mon Feb 17, 2014 1:01 pm

The 400 grit latte ground chips out of my Henckels knife in a couple minutes, they weren't monster chips but I thought it was fast enough.
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