Why so sharp?

Joined
Jun 16, 2010
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163
So im fairly new to the forums here but see that a lot of people are working to get their knives crazy sharp and I ask why. The knives I have are used everyday and are usually beaten up by daily tasks. I have a DMT c/f duofold that gets them sharp in a short amount of time. Ive never have a knife that could pop the hairs off my arms but they can definately perform whatever task that I throw at them. So I'm wondering if its worth it to go that extra distance and get them crazy sharp or is it just a time if they are constantly used and abused?
 
I've been wondering this lately, myself.
Being a woodworker I'm all about sharp tools and I've finally gotten to the point where I can get a knife super duper, scary, stupid sharp.
I don't think ultra thin edges are good for utilitarianism and they are just freaky sharp.
It's occurred to me lately that if I closed a really sharp blade on my finger I'd have a decent gash.
If I closed a super duper, ultra stupid sharp CPM M4 blade on my finger there is a chance I could get an amputation.
I'm rethinking the stupid sharp approach with one hand open/closers.
 
having a shaving sharp knife is ok but there are limits that must be taken into consideration. i can use an 80 grit belt to work up a burr and polish the edge on a slotted paper wheel which will shave hair and cut whatever i need to cut. a super thin edge will roll a lot easier than one that has a toothier edge, just as if it had a wire thin burr. i have a knife that i can chop hard elm, shave hair and push cut newspaper all day long. when i sharpen it up, i use a 380 grit belt to work up a burr and then make a few passes on a worn 400 grit belt before going to the slotted paper wheel which removes the burr and polishes the edge.
 
That's a question I had to ask myself a while back. I spent many years as a knife knut, keeping my knives sharp enough to field dry shave with only a minor razor burn, and spent way too much time obsessing over how sharp was my knife.

It finally took being retired with time on my hands to go fishing with the grandkids, walking in the woods with my better half of almost 40 years now, and many other things that I wanted to do. I didn't want to spend any more time sharpening a knife than I had to. I took to just putting a nice fast edge on my knives with an old boy scout carborunum stone that got my knife almost shaving sharp in a few minutes. It still gut and cleaned panfish, cut jute twine for the tomato plants out back, opened my mail and UPS boxes, and anything else I had to do. In fact, the nice toothy edge seemed to do a better job on slippery fish bellys than my polished, and obsessed over micro beveled edges.

I finally stopped obsessing over it, and I ended up enjoying my knives more, and actually sharpening less. I stopped worrying over how cutting this 'whatever' was going to mess up the carefully honed and stropped blade that I had worked so hard on to get hair whittling sharp. Now I just cut whatever I have to, knowing that if I dull up my knife, I can put it right in a few minutes on a small pocket Eze-lap hone or the old carborunum stone in the kitchen drawer.

I think like most hobby's that become obsessions, things get out of hand, and you sometimes have to take a step back and look it over. I thought back to my boy scout days, when we touched up our scout knives and 'official' Plumb hatchets on plain old gray carborundum stones and we did woodcrafts, merit badge work, and got by very well in our youthful ingnorance. Of course, this was the early 1950's, and the wonder gizmo's like sharpmakers and edge pro's were not invented yet. But somehow, against all odds, we had sharp knives. Hmmm. Something to think about.
 
I would say that it might depend upon what you are using your knives for on a daily basis, how sharp or what kind of sharp you want them. Shaving sharp with mirror polished edge may not be the kind of edge you would want it you were, say, cutting rope, rubber, cardboard, or other tough or abrasive material. I've had some knives with a 220 grit almost shaving sharp edges do wonders on those kinds of materials...utility edge is the term I use for that...nothing fancy, but it will cut what it needs to. Perhaps shaving sharp is not what you really need for the tasks that you perform, maybe it is. I guess I would match up the type of edge with what I would expect the knife to do on a daily basis and see what works for you. -Matt-
 
Because it's fun.

Those 3 words tell about 99% of the story. It my experience, a highly polished edge doesn't cut as well as one with some "tooth".

In my youth, I would sharpen my knives on Arkansas stones starting with soft and progressing to a white super hard stone. The edge was so polished the there were no visible scratches seen with a 10X loupe. They would shave hair like a straight razor, but the edge wouldn't last. Now I sharpen my knives on a medium Norton stone and finish with a few strokes on a crock stick. They still shave hair, but they they have a useful edge that lasts longer.
 
+1 uffda on the ceramic sticks. i used to finish all the knives i sharpened with crock sticks for years and the edges would hold up great. at one time i used to put a highly polished edge with a super fine pure white arkansas stone on friends knives. that edge would roll easily and they told me to go back to what i used before which was the ceramic stick. it would remove the burr yet like uffda said, it would leave a toothy edge that would last longer. the knives i sharpen now are finished off on the slotted paper wheel but the edge is still toothy.
 
because it's a cool thing. I agree about being able to cut well for all normal tasks, but can you do this? :D
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It's a knife, it's supposed to cut, I want mine to cut well.

The edge of the angle seems more important to me, I prefer a 600 grit edge, very tiny teeth, great for edc.

Lately I've been practicing more on my free hand and end up with about a 300 grit edge followed by about a minute or so on my green strop, but I do stupid stuff at work like use my knife to cut through the bailing wire on cardboard bales, so thicker edge to reduce the amount of edge damage.

If I had the time, pocket space and muscles I'm pretty sure I'd have knives from 10° to 60° in various finishes.
 
I understand thats its a hobby to sharpen knives to crazy sharp but is there a practical reason behind that or just a personal thing. I was just wondering because i thought about try to get my knives crazy sharp but was wondering if its even worth it since my knives get used a lot.
 
If I leave a little tooth on my blades they seem to perform better at work, IME.
Polished edges seem more likely to bend or chip with my knives.
I think there is such a thing as too sharp.
 
It's just a hobby, some people greatly enjoy perfecting their edges. As far as real world use goes, I don't see it as being very important or necessary. However, I keep my knives hair whittling sharp with the Sharpmaker, and I have to admit, there's something rewarding about watching a blade cut slivers on a hanging hair.

The only time I've found a super sharp edge to be a great boon is during fishing. Trimming excess line is a much easier task with a scary sharp knife, especially if you use Fireline or braid. I guess that goes for any fine detail oriented project, though.
 
they can definately perform whatever task that I throw at them.

Do you mean perform easily? I like my knives to very easily cut stuff that needs to be cut - it they do the job very well and very easily then I am happy. What more could I ask of my knives?
 
It's fun, sharper is safer, and we enjoy pushing the limits. I've found that thinner edges also sharpen much quicker than thicker ones, and aren't nearly as delicate as most people think. They also make cutting a joy, as it takes a LOT less effort to make the cut, with a LOT more control.

Once you are good at it, it doesn't take much longer to put the super edge on.
 
Because I like to push the envelope on what I can do. Sharpening is a skill that I'd like to develop and I can improve it by pushing the envelope. It's like what I did on my 1911's I could get crazy light triggers up 1.2-1.3 pounds by tinkering with the engagement angles, spring weights, and spring lengths. Why? because I found it fun. Did it improve my shooting? No, but I learned a lot of things in the process. In the same way I'm hoping to learn about steels, edges, and edge geometry by pushing the sharpening envelope.

Inquiring minds and all that. And yes, I do use my knives often because I'm a farmer.
 
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