With this simple device you can sharpen your meat grinder knives quickly and correctly. Fast, because a drill, machine or screwdriver is used to rotate the knife, but correctly, because the device provides optimal pressing force on the entire plane without distortion.
Needed to assemble the device
- A pair of long bolts with four nuts for them.
- A pair of thin bolts with two nuts for them.
- Two springs.
- A piece of thin steel plate.
Making a device for sharpening meat grinder knives
The first thing we will do is make a device for sharpening a cross-shaped knife. We measure the internal size of the square hole with a caliper.
We grind the head of the bolt on a tapping machine to a square with the dimensions of a square hole in the knife.
We assemble the device in the following sequence:
We put a washer on the bolt with a square head, then a spring. Next is another washer and two nuts. We tighten the spring with nuts so that pressure is created and the spring does not just dangle.Now we tighten the nuts together with two wrenches so that nothing comes loose in the future.
The device is ready.
But before we start sharpening the edges that are adjacent to the mesh knife, let’s sharpen the perpendicular planes. Let's do this on the same tape machine.
Let's put everything aside for now and start making a device for the mesh knife.
You will need a rectangular piece of metal. You can take steel or aluminum.
We apply the mesh to the knife to mark the boundaries and cut off the excess, drill three holes: in the center and on the sides for guides.
Drill the middle hole for the large bolt. And va small ones for thin bolts.
We assemble the device. We insert the central thick bolt, having first screwed one nut onto it. Then fix it with another nut.
We insert thin bolts of the same length into the small holes and also secure them with nuts with force.
The device is ready. The main thing is that the central bolt is lower than or equal to the length of the thin bolts relative to the level of the rectangular plate. See photo.
Now the devices are ready.
Sharpening meat grinder knives
Sharpening will be done on a vertical drilling machine, but you can easily use a hand drill or screwdriver.
We fix the device for sharpening the mesh knife in the chuck.
We will do the sharpening in three stages: first with sandpaper with coarse grains, then with fine grains, and finally with the finest grains.
We place it on a flat pad made of a piece of steel or other material. The main thing is that the surface is perfectly flat. Then we put coarse-grain sandpaper on top, then the mesh knife itself. We lower the device so that all the bolts fall into the holes. There is no need to follow through to the very end.It is necessary for the spring to create pressing forces.
We turn on the machine and sharpen the knife within a few minutes.
Next, stop the machine and replace the sandpaper with finer sandpaper. We continue to sharpen the knife for several minutes.
Now it comes to finishing paper with the finest grain.
The result is clear:
The same thing needs to be done with a cross-shaped knife: first, large paper.
Then small:
Well, the smallest one:
The result is excellent.
All knives are sharpened as best they can, both surfaces are ground to one another. To check this, we will insert a strip of paper into the hole and try to cut it with a rotating movement of the knife. If everything worked out, it means the result of the work has been achieved.
Agree that the design is not at all complicated, but very simple. And if you regularly sharpen knives, you simply need to make one for your home.
Watch the video
In the video you can clearly see the assembly of the sharpening device and its testing.
