Instructables
Picture of How to make a  knife sharpener
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I could never sharpen a knife worth a beans so this is my first attempt of making my own. It works pretty good. I have plans of making another one .
adillbeck3 years ago
My pocket knife is a folding utility knife. I got it for my art classes where you were cutting stuff all the time, and it was a lot more handy than a normal box cutter.
Blade gets dull or chipped I just pop it out and put in another...
That being said, this could be nice for kitchen knives.
I sharpen utility knife blades, a lot! I put a better edge on them than comes from the factory too.
Prometheus6 years ago
When sharpening knives, always cut into the stone, sharpening a knife like a barber's razor will lead to burrs which will cause the edge to deteriorate rapidly. Cutting in prevents these burrs, and produces a much finer edge.
i'm no expert, but from what i've read from professional knifesmiths, they sharpen the edge until they get a burr, then they flip it over until they get a burr on the opposing side, then "strop" the burr off. this combined with a "relief" (according to what i've researched) will produce the sharpest edge possible. i also read that you want a +27° only on combat or utility knives, a 20-25° on pocket knives, and 12-18° on cutlery (cooking) knives or knives that should be razor sharp and for light purposes. i hope that helps.
As a professional chef, I would say that 12-18 on cutlery is very sharp, but also very frail... If you want to sharpen your knives a lot, every day or more, then go for it, but I put a 30 degree edge on mine, which is generally sharp enough to shave an arm with, and also can hold up to the repeated abuse from chopping and slicing.. and I only have to really get after the blade and re-sharpen once a week, and thats with hours on the cutting board every day.
You are absolutely right about the smaller angles being frailer. They dull quicker even on a high quality blade. It was always explained to me that it's a trade off between easier to cut with (lower angles) and easier to maintain (higher angles). Finding that balance is important. I think I'll try a 30 degree edge on a kitchen knife and see how it holds up.
coolbeansbaby68 (author)  Prometheus6 years ago
i didnt know that 27 degrees was the best thanks for the info
I had one I made with a 78 rpm record player all guts removed except motor , then glued various grits to cardboard circles. Change grit by popping off ht e 'record" of grit, put on a nwe one.

But this is a sweet homebrew. Also go to Mother Earth news for other option belt sander home brew.

LoneWolf3 years ago
Awesome work!!! 5*
pookie23 years ago
looks very easy to sharpen knives now ..
Ole bally4 years ago
 As an ole Pro Hunter, I often have to sharpen knives! To keep an edge on the knife, I use the top edge of the truck window pane. Open the window til its about 2/3rds the way down, jam the door open with yr knee and then sweep the knife blade along the glass edge, cutting into it at about a 15 degree angle. Do it quickly so as to keep the same angle of the cut throughout!! You will get a slight burr on the blade, but about 20 sweeps will keep it razor sharp! I strop it on my hand! Don't cut yourself!
Prometheus6 years ago
27 degrees is the accepted standard for overall durability and sharpness, for those who wanted to know.
awoodcarver6 years ago
I like the idea since I am always sharpening knives but what angle are you setting it at or is it adjustable ? Is it made for the one stone you have there or can coarser or finer ones of different sizes be used?Instead of a slide show imho it would be better as a step by step maybe your next one can be .Very nice idea and something that I need to make.... adding it to my favs
I use to have a knife sharpening kit when i was younger that had 3 settings, 15*, 30* and 45*, a 45* sharpen would last longer but be "duller" overall, whereas the 15* was like a razor but would dull quickly :)
coolbeansbaby68 (author)  waterppk6 years ago
they say 15* is for pocket knives and 5* is for fillet knives.
coolbeansbaby68 (author)  awoodcarver6 years ago
Its adjustable, theres a bolt just above the clamp . its set at 10 degree's. thats the only stone i have .Its a medium stone.I going to make another one a bit smaller .A few redesigns its my first attemped off the top of my head so theres gonna be faults with it .thanks for the comment.
shilohjim6 years ago
You did a fine job but if you don't have the materials just laying around it would probably cheaper to buy a Lansky sharpening kit. Sometimes it's just fun to be able to build it yourself.
Awesome! I just use that brick thing and swipe it back and forth-- but this is way cooler. Nice job!
mfunk6 years ago
This is inspired! I have been looking for a way to sharpen my own. Favorited.