Let's Build a Fixed Angle Knive Sharpener




Introduction: Let's Build a Fixed Angle Knive Sharpener

There are loads of very nice 'ibles on how to make knives.
Thus I will not bore you with more of that.
There are also a bit of 'ibles on knive sharpeners.
Mostly, they look a bit big and/or over complicated in my opinion.
Some have nice points though, so do check them out before you decide to make one.
Here are some.

The need arise for many a aspiring knife makers to give that new extension of the soul a honing edge to befit its greatnesness.
Some people have bought sets for that.
Or you can go buy one, but it will set you back quite a bit of money.
Lansky is one make, not excessively expensive, if you need to ask a google what I am talking about.

Or you can make one that works not bad at all.
For a fraction of the cost too.

Sounds like your pint of brew?
Do read on.

Step 1: Main Ingredients and Equipment

You will need a sandstone block or a whetstone or something else maybe.
Sandstone can be found at many many places, for free sometimes, I highly recommend it.
Some nice and strong neodymium magnets, Also known as rear earth magnets.
You might be able to repurpose a junk yard electro magnet to this cause if you are desperate.
But be sure to send me pictures of the results.
Some form of measuring degrees
Stiff thin rod, I used a copper brazing rod.
Some thin planks to mount it on. Various things will work there I guess.
Right angle bracket, used to put shelves against walls.
Aka Super glue.
Sodium hydrogen carbonate.
Aka Baking soda, bicarbonate of soda, sodium bicarbonate.
Possibly, a knife, believe it or not.
Most can be done with a simple grinder or file even and a saw I'm sure.

Step 2: Safety

This is all hypothetical.

None of this should be tried at all.

Especially the bits requiring power tools, chemical reactions, sharp or blunt knives and, you know, brains.

Step 3: Starting Out

Fasten the rare earth magnets with P-R-P
Add thin layers bicarbonate of soda, and add drops of Cyanoacrylate.

Check this link out to see in detail descriptions about it if you need to learn more.


Step 4: Get or Make a Sharpening Stone

Cut a few strips sand stone from a block.
I used a granite blade on a small hand angle grinder, and really, it was very very easy and quick.

I flattened it afterwards on a belt sander in seconds.

Cut a few for spares.
If you can get different gritted stones, it will be awesome.

Step 5: Preparing the Stone

Using a belt sander, I took off some of the brazing rod's material.
The P-R-P will hold everything better together this way.

I also flattened the part of the rod that fits to the sandstone. It will secure it better.

P-R-P it good.
I took excess P-R-P off with a bench grinder afterwards
and buffed it up a bit.
The dark-look, is from the buff.
I think I buffed the knife on it previously and it had some wax on it still.
Anyhoo, I liked the darkness, and did it all over, except the bottom working part.

Step 6: Angle of Attack

Knife that I designed this for is on the magnets.
30 degree triangle to get the angle I want.

I will not get entranced into discussions about angles.
I picked it.
Pick your own if you wish.

Notice the mark where I will cut the wood.
The bracket moves forward to that point and get cut off where it extrude.

Step 7: The Majestic Mechanism - Body - Main

P-R-P the bracket good.

Step 8: Angle of Attack = Kill or Not

Check if your angle of attack is acceptable.
You can drill extra holes to get other angles.

Step 9: Testing , Testing 1,2,3

Dipping the stone in water ever so often,
the knife took on an edge quickly.

It is not difficult to handle really.
I just hold everything in my hands, and supported the knife with one hand.
The magnets keep its vertical plane right, I just lightly supported it not to twist direction.
The magnets makes it really quick and easy to change between sides of the blade also.

I left the copper brazing rod long. I just like it that way.

Step 10: The Only Thing That Matters. Do It Perform?

As can be seen,
The stone worn out quite a bit.

I imagined its because I had to make a entire edge on the knife instead of just sharpening it.
From this point on it should wear out much slower.
If not, I cut 4 pieces of sand stone as spares, so its not something that bothers me.

The blade is not razor sharp, but at 30 degrees, that is not expected.
It took an edge fast, looks good, and cuts if asked.
I'm happy with the results.

I liked some of the mentioned 'ibles, in that some had nice steel pieces that have lots of holes, so one can change the angle of attack as is needed.
I don't need it now, but its certainly something nice to have.
Easy, one can add some more holes with a drill as needed here.
Also, it is easy to make a few different stones with wires to get different grades of fine sharpening.
Maybe a ceramic piece as final stone.
I have a idea to use plaster of Paris and some polishing grit.
Alas, another day.


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    6 years ago

    You can use the back of a ceramic tile to straighten and level out your stone after each use. With sand stone it shold be easy to define a razor-sharp edge in the last stage because the particles ripped out of the surface of the stone will break down to form a slurry with polishing properties - provided you use it wet an with a dab of liquid soap


    Reply 6 years ago

    Hi, Thank you for your comment.
    I have acquired a ceramic tile that's very thick.
    I intend to use it directly as a last step in sharpening, as its much smoother then the sandstone.


    7 years ago

    finally a basic sharpener I can easily make! lol I've been looking for something like this for awhile thank you :-)


    8 years ago on Introduction

    Wow, very creative use of the magnets; I can imagine that it'd hold just as well as the clamps of Lansky style sharpener. What I think is most impressive is that you even cut your own sharpening stones! I'd have thought that sandstone was too coarse to make a good sharpening medium.


    Reply 8 years ago on Introduction

    Thanks for the comment -)

    I'm not completely sure, but I think one get different grades in coarseness sandstone.

    I want to experiment more and check If i can make some finer stones,with gypsum and polishing mediums.


    8 years ago

    wow that's cool!!!
    does it get it sharp enough to shave?


    Reply 8 years ago on Introduction

    Thank you cbirkbeck

    No, 30 degrees isn't designed to be shaving - sharp.

    Its only sharp enouth to my liking.

    But the edge can be made as you wish.

    10 degrees would propably get you there.

    Next, with the matereal used, its not super smooth, so sandstone will propably not be able to give a very nice shaving edge, but you could get there propably with a better finer made stone.


    8 years ago

    great ible! You know there is always room for another knife making ible!