Atoma 140 vs 400, Longevity?

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Benzgg

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Jun 27, 2019
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Hi guys, I'm choosing between Atoma 140 and 400. I have sharpened 50+ knife and I own a king KDS 1000 and Arashiyama 6000. I will be sharpening many really really dull crappy knifes (52-55 HRC) of my friends (so basically need to reshape and put on new bevels). I want to have a coarse stone to complete my set up, and also use it as flattening stone, so atoma seems ideal for me.

I have never tried diamond plates and based on many stories (lol), my thoughts are:

140 is fast cutting, but too coarse for flattening 6000 grit stones, leaving a rough surface. Also it might be eating away too much metal for not-so-dull knifes, and wasting a lot of whetstone when flattening.

400 is faster wearing than 140 (shorter lifespan). Also it might be too slow for reshaping knifes.

Also, how long do they last anyway? I'm a bit worried that those crappy knifes will eat away my expensive diamond plate
 
I'm sure I've got many things wrong, so any corrections or experience shared would be very appreciated, Thx!
 
I bought both and have used them primarily for lapping razor stones. I don't think you can wear one out on steel easily and not for many years and uses. For very rough work and reprofiling I use and would recommend a belt sander. Harbor freight model is less than an atoma 140. Jmo.
 
Bill3152 said:
I bought both and have used them primarily for lapping razor stones. I don't think you can wear one out on steel easily and not for many years and uses. For very rough work and reprofiling I use and would recommend a belt sander. Harbor freight model is less than an atoma 140. Jmo.
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Except my Atoma 140 cuts almost as fast as a belt sander and won't burn my edges ;)

~Chip
 
On a small surface area (small bevel width) a brand new Atoma 140 might cut almost as fast as a belt sander time-wise, but put a little wear on that Atoma, especially on a wider bevel, and the belt sander will kick its @55. Not to mention the benefit of having the ability to use a new belt every time the current one starts to slow down a little. Once the Atoma dulls/slows down, the fat lady has sung. I own both. The Atoma mostly sits on the shelf.
 
Thanks guys, will definitely get a belt sander. I will try to figure a way to use cheap hand-held sander as a bench sander.... I will find a way.
 
Benzgg said:
So what grit of sanding belt would u recommend for reprofilling? ie How to not burn my edges?
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It's not necessarily a question of grit, it's techniques. A very light touch with sharp belts, and ideally water cooled...at the least, dunking after each pass. I'm perfectly confident in my ability to sharpen with a belt sander without burning an edge, but in the hands of someone who doesn't know what they're doing it can ruin a blade in seconds. An extra coarse diamond stone does the job almost as fast with none of the risks.
 
WValtakis said:
It's not necessarily a question of grit, it's techniques. A very light touch with sharp belts, and ideally water cooled...at the least, dunking after each pass. I'm perfectly confident in my ability to sharpen with a belt sander without burning an edge, but in the hands of someone who doesn't know what they're doing it can ruin a blade in seconds. An extra coarse diamond stone does the job almost as fast with none of the risks.
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Thanks! Will have a good think about the two options.
 
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