Lessons learned from getting Edge on Up tester

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Jul 2, 2025
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Some lessons learned from getting the Edge on Up tester. NOTE: this is just my perspective at this time.

1. Incredibly useful tool! The ability to objectively evaluate the sharpening process has transformed the way I sharpen. I now can consistently get excellent results. Prior to getting this tool, I was using methods of sharpness testing that were fine for what they were (e.g., paper cutting and rolling paper cutting). This tool provides more precise information. It allows testing that is objective. It has been a game changer for me as I continue on my sharpening journey.

BTW: I had agonized over this purchase for months. I just wasn't comfortable spending the money. In hindsight, that was foolish. If you want to improve your sharpening skills, you need to get objective data. This tool helps to define what works and what doesn't. There's no more guessing. It's a measurable thing.

2. I need recognize who I am as a person. I'm a bit OCD. Having a tool that provides objective data means I'm going to obsess over the numerical results. I'm going to spend a great deal of time and energy trying to figure out how to drive those values lower and lower. It becomes part game, part challenge. And, that's all fine, up to a point. What is that point? I don't know. I'm obsessive. I tend to go overboard on things that I get into.

3. At some point, it doesn't matter, at least to me (and I'm guessing, to most people). What do I mean? I've been obsessing about technique and process and practicing a great deal on my own knives. Yesterday, I was able to get a very nice score on a Mercer that is one of my go to knives for food prep. After seeing a score of 77, I was thrilled to experience what cutting with that knife would be like. This morning, I broke down some very fresh and delicate strawberries. How did the knife perform? To me, it performed exactly the same way that it had performed last week when I was using it to cut similarly ripe and delicate strawberries when it's BESS score was 120. At the end of the day, the job of a knife is to cut. This knife cuts. Beautifully! Is it cutting"better" than it was last week? Not in any way that I can detect.

For most people that are not doing very specific cutting tasks or huge volumes of cutting tasks (meaning, nearly all home cooks), it feels like there is a diminishing returns process happening. Once you get to a particular sharpness value, chasing ever lower numbers feels mainly like an ego exercise.

Do your carrots really react differently when being broken down by a knife with a BESS score of 150 compared to a knife with a BESS score of 80? Donno. Perhaps if someone is working in a restaurant and they're constantly breaking down (say) 50 lbs of potatoes and 30 lbs of carrots a day, that sharpness could result in less effort being needed per lb of produce processed, and ultimately lead to improved physical comfort at the end of the shift.

I'm still early in this process. I don't yet have the experience to understand how a particular knife with a particular BESS score will work in practice. What I can say is that once my own knives got below a certain BESS score threshold, they became more of a joy to use.

The second point I listed above still is present. I AM still obsessing over the scores! I'm still thinking about what things I can try to get those scores to improve and to be more consistent. I'm working on processes to achieve outstanding results in an efficient manner. And, I'm going to try to tame that obsessive feeling with my experience this morning with the strawberries.

Bruce
 
The BESS system really helps you dial in your skills and procedures. It helped me get rid of some habits and develop a few better ones.

It's good to learn the optimal score for different knives and different uses, though, because the lowest score is not always the best edge for a particular job. Fibrous materials prefer a particular range, food another, maybe EDC is different depending on the user.
 
Do your carrots really react differently when being broken down by a knife with a BESS score of 150 compared to a knife with a BESS score of 80? Donno. Perhaps if someone is working in a restaurant and they're constantly breaking down (say) 50 lbs of potatoes and 30 lbs of carrots a day, that sharpness could result in less effort being needed per lb of produce processed, and ultimately lead to improved physical comfort at the end of the shift.
Speaking as a longtime chef I'd say geometry is far more important than sharpness for this. Obviously you want a knife to be sharp but a thin knife that's thin behind the edge will keep blasting through prep even as it gets duller. And even a very sharp knife will often cut certain things poorly if it's wedging due to being too thick behind the edge. I'll note that sometimes I deliberately still choose a thicker knife when I need to be able to do lots of things with the same knife. For example, if I have just one knife on the board during service it might have to slice a chicken breast well but also be able to split a lobster without edge damage.
 
Speaking as a longtime chef I'd say geometry is far more important than sharpness for this.
ABSOLUTELY!

I have a cheap Kiwi branded knife that I bought from Amazon more than 10 years ago. Two knives were ~ $12.50 at the time. It's a crappy knife in many respects. It's made from cheap, soft steel. It's got a terrible handle that is uncomfortable to use for any serious prep.

AND...that soft steel is hard enough to take an edge really well! It is also quite thin and has a bunka-like shape (reverse tanto). It is the knife that I instinctively reach for when I need to do some quick prep. Why? It glides through most fruits and soft veg like a champ!

Do I reach for that knife when I want to break into a block of hard cheese? Or to break down a lot of protein? No. It's too thin to handle those jobs comfortably.

Geometry is super important!

Unfortunately, I'm still early in my knife thinning journey. That's next on the list for me.

Bruce
 
I don’t want to downplay what BESS has done because they have done something OG knifenuts tried to do since the beginning of knife message boards and forums. They allowed everyone to compare sharpness on a standard test and have consistent results. I can compare sharpness on my knives to someone across the world or country with a standard test and not only can we both be confident our results are comparable, anyone else with access to the device can join in and contribute data.

That said, if you want to just compare your knives for purposes of testing sharpening methods etc, a home made thread cutting device on a kitchen scale will work fine. You can calibrate by testing double edge razors and scaling accordingly. Just don’t try to compare your results to a BESS value, as the numbers won’t work out.
 
I don’t want to downplay what BESS has done because they have done something OG knifenuts tried to do since the beginning of knife message boards and forums. They allowed everyone to compare sharpness on a standard test and have consistent results. I can compare sharpness on my knives to someone across the world or country with a standard test and not only can we both be confident our results are comparable, anyone else with access to the device can join in and contribute data.

That said, if you want to just compare your knives for purposes of testing sharpening methods etc, a home made thread cutting device on a kitchen scale will work fine. You can calibrate by testing double edge razors and scaling accordingly. Just don’t try to compare your results to a BESS value, as the numbers won’t work out.
In my case, and I would think most who buy Bess testers, are not looking to compare numbers with anyone. I bought my tester so I could accurately measure my results, period. My goal was and still is to create burr free apex's. You are able to see if that microscopic burr is gone via Bess. According to the late great Vadim Karichuck, once you have completely removed the burr and root, you will be reading 70 or below on your tester.
Also, the tester enables me to test the effectiveness of stropping compounds and techniques. By measuring results you are able to improve techniques and see those results measured.
I had been using a diamond paste without the expected results. After trying a couple more and measuring the results I was able to achieve superior results in a shorter amount of time by using a different product.
Finally, different steels react differently to various grit abrasives, pressure and expected results. Tough to settle on a sharpening method if you can't measure results.
I would say those who purchase BESS Testers are in fact, attempting to take thier sharpening to the next level. Comparing my numbers to someone else's has never entered my mind. The only person I'm trying to beat, is me.
If you're trying to up your game, for whatever reason, measuring your results seems like the only place to start. IMHO
Al
 
While all that is true, the BESS tester isn’t necessary for measuring sharpening results. A simple home tester can be made and used with some verification testing and sharpness standards. Is it more uniform? Probably so. It allows comparisons and incorporation of others work and experiments into one’s own because results can be compared. That is the genius and value. Vadim’s results could not be used and directly compared by others without it. However, it’s not required for measuring sharpness and improvements in procedure and technique.
 
While all that is true, the BESS tester isn’t necessary for measuring sharpening results. A simple home tester can be made and used with some verification testing and sharpness standards. Is it more uniform? Probably so. It allows comparisons and incorporation of others work and experiments into one’s own because results can be compared. That is the genius and value. Vadim’s results could not be used and directly compared by others without it. However, it’s not required for measuring sharpness and improvements in procedure and technique.
I would agree, it is not required to improve results. You most certainly could make you own or use some other method to gauge your progress. Folks have been sharpening things since the beginning. However, I think for anyone, an accurate measuring device can speed up the learning process if that is your desire.
 
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