With the help of 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 inner size square hole 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 hand drill or a 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.
Dear visitors!!!
As we know, sharpening knives for meat grinders is carried out by specialists working in workshops that are equipped with appropriate equipment. But usually, we do not all have free time and the opportunity to visit specialized workshops to meet our needs.
Usually for grinding disk knife(grids) and sharpening the cutting edge of a cross-shaped knife (for a meat grinder) - you can use an electric sandpaper.
Electric emery
Currently, electric sanders are available in a large assortment in specialized stores, which, of course, meet their technical requirements.
However, for some reason, we have to make this electrical appliance with our own hands. Insignificant costs for the manufacture of electric emery include the purchase of an emery wheel and an attachment, which is installed on the rotor shaft of the electric motor. The electric motor itself for emery is borrowed most often - from an unnecessary washing machine. It should be noted here that for grinding the grate and sharpening the cross-shaped knife, there should be no radial and axial runout when rotating the emery wheel. The axial and radial runout of a rotating sanding wheel will depend on how you install the sanding wheel. That is, it is initially necessary to determine the displacement of the emery wheel (as it rotates) and then eliminate its runout.
Still, in terms of quality, preference should be given to special types of machines designed for grinding grates and sharpening cross-shaped meat grinder knives.
Machine for sharpening meat grinder knives
Using this sharpening machine, you can set the required angle for sharpening the cutting edge of a knife, and also grind the meat grinder grill itself directly.
If it is not possible to purchase sharpening machine for meat grinder knives and others cutting tool, - I suggest you watch the video, which I think contains useful information.
That's all for now. Follow the section.
This homemade device allows you to sharpen the knives and grates of the meat grinder correctly and quickly. Essentially, these are two attachments for a screwdriver or drill; the design of the devices is made in such a way as to evenly distribute the force over the entire plane during sharpening.
Materials you will need:
- Two long bolts and 4 nuts for them.
- Two thin bolts, as well as two nuts.
- Two springs.
- Two washers.
- Metal strip.
This is what the tools for sharpening a knife and mesh look like.
We start by making a device for sharpening a knife.
We measure the size of the square hole of the meat grinder knife.
We take a long bolt and grind the head into a square, knife hole.
Now we assemble the device as follows: put a washer on the bolt with a square head, then a spring, another washer, two nuts. We tighten the spring with nuts so that pressure is created and the spring does not dangle.
We tighten the nuts together with two wrenches.
The device for sharpening the meat grinder knife is ready.
Now let's start making a device for sharpening the mesh of a meat grinder. We take a strip of metal and drill three holes in it, a central one for a large bolt and a couple of side ones for small bolts. Please note that the side bolts must fit into the outermost holes of the mesh.
We assemble, insert the central bolt, having first screwed one nut onto it, and secure it with another nut.
We insert thin bolts of the same length into the side holes and also secure them with nuts.
It is important here that the central bolt is lower than or equal to the length of the thin bolts relative to the level of the rectangular plate.
This is how we made devices for sharpening knives and mesh grinders.
The process for sharpening the mesh is as follows: first with coarse-grain sandpaper, then with fine-grain sandpaper, and finally with the finest grain.
We place it on a flat surface or other material, it is important 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.
Turn on the drill and sharpen the mesh for a few minutes.
An old manual or new electric meat grinder in the house is simply a necessity. Preparing minced meat takes a few minutes, but for this you need a working meat grinder that will not let you down in the midst of work. And if the unit starts to malfunction, the answer is always the same - dull knives. So the question arises, where and how to sharpen a knife for a meat grinder, if it is needed at the most crucial moment.
Design and principle of operation of a meat grinder
To understand how knives work and why it is necessary to constantly monitor their condition cutting surfaces, let's look at the structure and principle of operation of the unit.
The meat grinder consists of the following components:
- cast body (cast iron or aluminum alloy);
- cast auger (cast iron or aluminum alloy);
- movable four-blade knife;
- fixed grid with many holes;
- large front nut;
- handle for rotating the auger (in electric meat grinders - an electric motor).
The meat is loaded into the receiving hopper, from where it is fed onto a fixed mesh using an auger. Here the process of cutting meat takes place between a fixed mesh and a movable four-bladed knife. The chopped meat in the form of minced meat is pressed through the mesh holes into the receiving container.
When sharpening is needed
To understand why sharpening is needed, you need to understand the operation of all the parts during the production of minced meat.
When purchasing a meat grinder, all parts are completely new, as they have never been used. Therefore, the knives have an ideal contact surface. This is very important when operating the unit. There is a perfect cut of the next portion of meat falling into work area unit.
But after some time of operation, the meat grinder begins to malfunction. If the unit is manual, then more force has to be applied to rotate the handle. At electric drive, there are interruptions in the rotation of the auger, overheating of the electric motor and possible breakdown.
In an ideal way out of the situation, it is enough to buy spare parts in the store and, after replacement, continue to work quietly. But this option cannot suit the hostess either. After all, buying parts is not economically profitable. You need to figure out what is going on and how you can get out of the situation without buying new parts.
What happens to the meat grinder
After purchasing a meat grinder in a store, you need to read the operating instructions. Almost all manufacturers assure customers that the knives of their unit do not have a wear period and even sharpen themselves. Allegedly, during operation, the movable cutter, in close contact with the stationary mesh, slides along it and mutual self-sharpening occurs due to friction. But in reality we don't see this. After all, even in electric meat grinders, the cutting parts are made not from high-quality steel, but from ordinary steel.
When grinding the product, tendons, all kinds of inclusions, even small fragments of bones get caught. As a result of such work, the usual dulling of the cutting parts occurs and the minced meat grinding process is disrupted. After some time, the meat grinder simply does not grind the meat, but crushes it. Then the question arises, where to properly sharpen knives for a meat grinder.
Sharpening knives for meat grinder
So that you are not tormented by the question of where you can sharpen the knives for the meat grinder at the time of minced meat production, try to regularly inspect the parts. To do this, simply disassemble the unit and inspect the condition of the cutting units. If the surface is covered with rust, it must be sharpened to prevent destruction by corrosion. You always have a choice: where to sharpen your meat grinder knives.
If you prefer to entrust this work to specialists, then you can contact one of the sharpening centers of specialized enterprises in your city.
Sharpening knives in the workshop
If you decide to sharpen the cutting parts in the workshop, then this must be done in advance. It is necessary to inspect the meat grinder once a month and identify any defects.
In workshops for sharpening they use grinding machine Adems and sharpening abrasive stones are used.
If you have such a machine in your home workshop or garage, then you can sharpen knives at home. Let's look at how this can be done.
The machine consists of an electric drive and a horizontal faceplate. To perform this operation you must:
- lubricate the plan washer over the entire surface with oil;
- sprinkle abrasive powder onto the lubricated surface and distribute it evenly over the faceplate;
- turn on the machine and using magnetic holder We place the knife with the surface to be treated on the faceplate, pressing it in the center.
After surface treatment, another element is placed on the machine. Thus, horizontal working surfaces working in a pair of parts are achieved. The next operation is sharpening the edges of the movable four-blade cutter at an angle of 80 degrees using a sharpening abrasive. The final touch is grinding the cutting edges of the movable knife and the horizontal surface of the grate on the vulcanite stone.
Sharpening at home with sandpaper
What to do if you understand during the process of minced meat production: the meat is not cut, but “chewed”?
You can sharpen knives at home. The easiest way to sharpen cutting element- at home with your own hands. Need sandpaper for sharpening fine grain knives. It is not advisable to use coarse-grained sandpaper; it can damage the surface of the knife. After all, when sharpening knives in this way, great wear and damage to the cutting surfaces should not be allowed.
Sharpening is carried out on a perfectly horizontal surface. Having secured the sheet of paper, we begin to rub the surface of the knife being processed over it until we achieve a clean working surface. We do the same with the other knife. Having finished processing, we check the parallelism of the surfaces for clearance. It would be ideal if there is no visible gap between the cutter and the grate.
You can check the meat grinder using threads inserted through the grill of the assembled meat grinder. Turning on electric meat grinder, the cut threads should fall onto the table.
On the grindstone
You can sharpen knives using whetstones. To do this, we buy a sharpening stone made of corundum from 40 to 60 microns in the store. We make a platform out of boards to strengthen it and provide water supply during work. Having secured the stone on a stand, having previously moistened it with water, we begin to sharpen the moving element, making circular rotational and translational movements. This creates a finely dispersed abrasive paste, which brings the surface to grinding. Periodically rinse the cutter in water. When a shiny surface is achieved, the part is considered sharpened.
We process the mesh in the same way. At the same time, we check the fit of the knives against the surfaces. If there is no gap between the attached working surfaces, then the sharpening result has been achieved and the meat grinder can be tested in operation.
On the grinding machine
The two previous methods work if the wear on the cutting parts is insignificant, you just need to do a little reconstruction cutting edges and contact surfaces. For more serious wear and damage, a sharpening machine will help.
When starting work, it is necessary to check the condition of the working disk of the machine. It must be perfectly smooth and used only for sharpening work..
- Must be applied to work surface Disk GOI paste No. 4 and let it dry.
- Then we turn on the machine and when the disk picks up speed, we begin to work.
- Pressing the mesh onto the disk, we process until a uniformly shiny surface is obtained.
When processing a knife, it is necessary to work intermittently to prevent overheating of the workpiece.
Then we proceed to sharpening the four-bladed movable cutter. Here the work is carried out in stages.
Work for sharpening machine will be effective and fast if you know how to work and follow safety rules.
