The simplest device for sharpening knives at 30 degrees

I continue to sharpen the knife. I have already shown my homemade device for making descents (tapering surfaces of the blade). At the same time, I made a polishing disk, sewing several disks together so that they would not diverge. Next, the task was to sharpen the knife - to make cutting edges that form the cutting edge.

An attempt to sharpen it with a whetstone did not give me the result I needed, because the metal of the blade is hard and sharpening takes a lot of time. Therefore, I decided to make a homemade device similar to the one I made for forming slopes.

I installed the main part of the device - the angle - at the point where the surface of the grinding wheel is at an angle of 75 degrees to the vertical line. I used a regular corner piece and made a hole in the central part. I aligned the corners at 90 degrees so that the existing small semicircle would not interfere with work. I drilled a hole in the center for a 16mm bolt. A nut in the form of a clamp was welded to the bolt. A channel is installed at the bottom, the structure is pressed with a bolt and nut of 12.

The device can be raised or lowered with two nuts on the top bolt.When ascending, the sharpening angle will be larger, and when descending, it will be sharper (smaller). Using a clamp, the device can be moved towards the disk (for example, when the disk is ground down) or moved away from it.
The design can be simplified and you can install one long bolt so that you can immediately make descents or, lifting it higher, sharpen the knife to the desired angle.

The cutting edges are very smooth, as if made on a milling machine. If you correct the edges on a small block, the knife will be razor sharp. The result is an almost perfect sharpening. The advantage of this device is its very simple design, which can be assembled from scrap materials.

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Comments (15)

#1 tool sharpener Guests 3 September 2018 18:34
8

chamfer... this descent is called a chamfer, this is quite easy to achieve manually, you just need to get a little practice and know where to start
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1. #2 Sharpener from 13 years old Guests 7 September 2018 20:11
  3
  
  By the age of 14, I had sharpened more than 1,200 hoes and 1/10 of them were hardened. Let me explain to a professional, the slopes are slopes in front of the chamfer, which is the sharpening line of the tip itself, the cutting part of the knife blade.
  
  Answer
#3 Guest Dmitry Guests September 4, 2018 07:52
14

It would be better to clean up the garage.
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#4 SESSION Guests 4 September 2018 17:49
12

Steel Eater. Suitable only for budget (100-300 RUR) knives. I sharpen my knives on a manual device, where you can easily change the sharpening angle, removing only microns from the cutting edge.
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1. #5 Ivan Guests 8 September 2018 22:46
  3
  
  If possible, please send a drawing. Thank you.
  
  Answer
#6 Goga Guests 4 September 2018 22:34
2

Very original design.
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#7 Guest Vladimir Guests 5 September 2018 12:10
0

It’s interesting, if you try to sharpen an ax on this device, if it works, then you should definitely do it. In short, I subscribed and naturally upvote))
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#8 Nikolay Guests 5 September 2018 23:05
2

I don’t know what to say, it’s probably normal if someone doesn’t have the skill to work with sandpaper. Personally, I myself sharpen a knife without any equipment, at any angle, twice, even on a simple wheel, even on a diamond, it doesn’t matter. I also sharpen knives for the winter “Swedish drill” by hand on a diamond wheel, and they drill ice perfectly, like new ones. But naturally, I will give the author a rating for the simplicity of the tool!
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1. #9 Borga Guests 20 July 2019 14:10
  0
  
  Congratulations !!! your arms really grow out of your shoulders.. alas, this does not threaten me..
  
  Answer
#10 Guest Guests September 7, 2018 09:48
4

How was overheating controlled during sharpening on the machine? You need to sharpen a knife on a stone very carefully, at high speeds it is easy to overheat the cutting edge and change the properties of the metal, in other words, it was a normal knife, but you will end up with a plasticine one that will no longer hold the cutting edge. The same applies to polishing, where high speeds are also unacceptable because the product melts. So all this is great, of course, but if the machine does not have speed control, using all this is fraught.
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#11 cat Guests September 9, 2018 07:53
9

sharpening on such a stone means ruining the blade. and in general, if you need a device for sharpening, learn to work with emery
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#12 Guest Sergey Guests 17 September 2018 19:05
2

And why such difficulties? Are you going to shave with it? To cut sausages, you can edit a little on a block every day!
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#13 a lion Guests 1 November 2018 14:54
2

It’s too complicated, there are a lot of settings if the knives are of different thicknesses, and most importantly it’s dangerous. There is no shield, the knife can get stuck between the device and the circle if the gap changes slightly. It’s easier to fill your hand and sharpen it calmly.
- Answer